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The following is an excerpt from a 10-K SEC Filing, filed by NEXEN INC on 3/1/2005.
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NEXEN INC - 10-K - 20050301 - PART_I

PART I

ITEMS 1 AND 2. BUSINESS AND PROPERTIES

TABLE OF CONTENTS
PAGE

About Us.......................................................................3
Strategy.......................................................................4
Understanding the Oil and Gas Business.........................................4
Oil and Gas Operations.........................................................4
       Gulf of Mexico - United States..........................................5
       North Sea - United Kingdom..............................................7
       Middle East - Yemen.....................................................9
       Offshore West Africa...................................................11
       Other International....................................................12
       Western Canada.........................................................13
       Athabasca Oil Sands ...................................................15
Reserves, Production and Related Information..................................17
Syncrude Mining Operations....................................................19
Oil and Gas Marketing.........................................................21
Chemicals.....................................................................22
Additional Factors Affecting Business.........................................23
       Government Regulations.................................................23
       Environmental Regulations..............................................23
Employees.....................................................................24

2

ABOUT US

Nexen Inc. (Nexen, we or our) is an independent, Canadian-based, global energy and chemicals company. Previously Canadian Occidental Petroleum Ltd., we were formed in Canada in 1971 from the reorganization of two Occidental Petroleum Corporation (Occidental) subsidiaries. We combined their Canadian crude oil, natural gas, sulphur and chemical operations. We've grown from producing 10,700 boe/d before royalties with revenues of $26 million in 1971 to 249,600 boe/d before royalties (including Syncrude production) and revenues of $3.9 billion in 2004. We achieved this growth through exploration success and strategic acquisitions. Through over 30 years of operations, we have been profitable every year, but one, and have been paying quarterly dividends consecutively since 1975.

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[Margin Text: Nexen - an independent, Canadian-based global energy and chemicals company.]

In the 1970s, we expanded our Western Canadian assets and entered the US Gulf of Mexico. We finished this decade with production of approximately 11,000 boe/d before royalties and revenues of $126 million.

In the 1980s, we acquired Canada-Cities Service, Ltd. in 1983, which doubled our size, and included an interest in the Syncrude Joint Venture, our entry into the Athabasca oil sands. Acquisitions of Cities Offshore Production Co. in 1984, and Moore McCormack Energy, Inc. in 1988, further increased our presence in the Gulf of Mexico. We finished this decade with production of approximately 68,600 boe/d before royalties and revenues of $591 million.

In the 1990s, we had two defining moments: discovering oil on the Masila block in Yemen and acquiring Wascana Energy Inc. The first of 17 fields at Masila was discovered in 1991, and Masila has produced over 825 million barrels since start-up. Our 1997 purchase of Wascana Energy Inc. almost tripled our Canadian production, with our Hay discovery in northern B.C. increasing this further. In 1998, we entered Australia with an interest in the offshore Buffalo field and entered Nigeria as the operator of the Ejulebe field. Also in 1998, we discovered Ukot on OPL-222, offshore Nigeria, the first of several discoveries to date on the block. We finished this decade with production of approximately 239,200 boe/d before royalties and revenues of $1.7 billion.

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[Margin Graphic: Chart of Production before royalties 1971 - 2004]
[Margin Graphic: Chart of Revenues 1971 - 2004.]

So far in the 21st century, we have made a number of discoveries and two strategic acquisitions. In 2000, we discovered Gunnison in the deep-water Gulf of Mexico and Guando in Colombia. In that same year, we agreed with Ontario Teachers' Pension Plan Board (Teachers) and Occidental, to purchase Occidental's 29% interest in us. Teachers purchased 20.2 million common shares and we repurchased the remaining 20 million common shares for $605 million. We also exchanged our oil and gas operations in Ecuador for Occidental's 15% interest in our chemicals operations. In addition, we changed our name to Nexen Inc. The following year, we discovered Aspen in the deep-water Gulf and signed a joint venture agreement with OPTI Canada Inc. to develop, produce and upgrade bitumen at Long Lake. On OPL-222, offshore Nigeria, we discovered Usan, the second discovery on the block, in 2002. In 2003, we discovered two fields on Block 51 in Yemen. In December 2004, we acquired EnCana Corporation's U.K. subsidiary, providing us with strategic operatorship of the Buzzard discovery and the producing Scott and Telford fields in the North Sea. Now in 2005, we are developing major projects and continuing an active exploration program for future growth.

For financial reporting purposes, we report on four main segments:

o Oil and Gas
o Syncrude
o Oil and Gas Marketing and
o Chemicals

Our Oil and Gas operations are broken down geographically into the US Gulf of Mexico, North Sea, Canada, Yemen and Other International (Colombia, offshore West Africa, and Australia). Results from our Long Lake Project are included in Canada. Syncrude is our 7.23% interest in the Syncrude Joint Venture. Marketing includes our growing crude oil, natural gas and power marketing business in North America and southeast Asia. Chemicals includes operations in North America and Brazil that manufacture, market and distribute sodium chlorate, caustic soda and chlorine.

Production, revenues, net income, capital expenditures and identifiable assets for these segments appears in Note 18 to the Consolidated Financial Statements and in Management's Discussion and Analysis of Financial Condition and Results of Operations (MD&A) in this report.

3

STRATEGY

Our goal is to grow long-term value for shareholders. We define value growth as increasing reserves, production and cash flow over the long term, measured on a debt-adjusted per share basis. This basis reflects the true growth realized by our shareholders. To accomplish this, we are creating sustainable businesses through exploration, technology application, strategic acquisitions and capital discipline.

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[Margin text: Our goal is to grow long-term value for shareholders.]

As conventional basins in North America mature, we are transitioning our operations towards major projects in mature basins, exploration in less mature basins and exploitation of unconventional resources. Projects are focussed in the North Sea, Athabasca oil sands, Gulf of Mexico, offshore West Africa and the Middle East - basins we believe have attractive fiscal terms and significant remaining opportunity.

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[Margin text: We are transitioning our operations towards major projects in generally less mature basins and unconventional resources.]

Our major projects typically have an extended period of time between sanctioning and first production due to their location and scale. These time lags cause non-linear growth year-over-year and significant up-front capital investment prior to realizing any production or revenues. We fund projects by maximizing cash flow from our producing assets, using various financial instruments, and selling non-core assets into attractive markets. We intend to dispose approximately $1.5 billion of assets in 2005 to help pay for our North Sea acquisition.

We also continue an active exploration program for future growth. We primarily explore in areas where we have existing production or infrastructure, or we have had recent exploration success.

In creating sustainable businesses, we are committed to good corporate governance and social responsibility. We believe companies that follow sustainable business practices outperform those with narrower priorities. We foster dialogue with stakeholders about our operational opportunities and challenges, from exploration to production to reclamation. Our goal is to help stakeholders become engaged participants in a continuing consultation process, while balancing their multiple, and sometimes conflicting, goals.

UNDERSTANDING THE OIL AND GAS BUSINESS

The oil and gas industry is highly competitive. With strong global demand for energy, there is intense competition to find and develop new sources of supply. Yet, barrels from different reservoirs around the world do not have equal value. Their value depends on the costs to find, develop and produce the oil or gas, the fiscal terms of the host regime and the price products command at market based on quality and marketing efforts. Our goal is to extract the maximum value from each barrel of oil equivalent, so every dollar of capital we invest generates an attractive return.

Numerous factors can affect this. Changes in crude oil and natural gas prices can significantly affect our net income and cash generated from operating activities. Consequently, these prices may also affect the carrying value of our oil and gas properties and how much we invest in oil and gas exploration and development. We attempt to mitigate these impacts by investing in projects that we believe will generate positive returns at low commodity prices.

We also have a broad customer base for our crude oil and natural gas. Alternative customers are generally available, and the loss of any one customer is not expected to have a significant adverse effect on the price of our products or our revenues. Oil and gas producing operations are generally not seasonal. However, demand for certain of our products can have a seasonal component, which can impact price. In particular, heavy oil generally experiences higher demand in the summer months for its use in road construction and natural gas generally experiences higher demand in the winter heating months.

We manage our operations on a country-by-country basis reflecting differences in the regulatory and competitive environments and risk factors associated with each country.

OIL AND GAS OPERATIONS
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[Graphic-World map showing location of oil and gas operations around the world]

We have oil and gas operations in Western Canada, the US Gulf of Mexico, Yemen, the North Sea, offshore West Africa, Colombia and Australia. We also have operations in Canada's Athabasca oil sands which produce synthetic crude oil. We operate most of our production, and continue to develop new growth opportunities in each area, by actively exploring and applying technology.

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[Margin graphic: Pie chart 2004 production before royalties by area]

4

GULF OF MEXICO - UNITED STATES (US)

The Gulf of Mexico is Nexen's fastest growing region, with over 30,000 boe/d before royalties of high margin production added from our deep-water Aspen and Gunnison fields in the past two years.

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[Margin caption: In the US, we've added 30,000 boe/d before royalties of high-margin production in the last two years.]

[Graphic: Gulf of Mexico map with Nexen's producing and exploration blocks]

Large discoveries, high success rates, production infrastructure and attractive fiscal terms make the deep-water Gulf of Mexico one of the world's most prospective sources for oil and gas. The deep-water prospects generally have multiple productive horizons and high production rates, which reduces risk and improves economics. Technology to find, drill, and develop discoveries is rapidly progressing and becoming more cost effective. And, the deep-water Gulf is relatively close to infrastructure and continental US markets, allowing discoveries to be brought on stream in a reasonable period of time.

Our strategy in the Gulf is to explore for new reserves, acquire assets with potential, and exploit our existing asset base. We focus our exploration program on three strategic areas:

o deep-shelf gas prospects;
o deep-water prospects near existing infrastructure; and
o deep-water, sub-salt plays with potential to become new core areas.

These areas are relatively under-explored, have potential for large discoveries, and have attractive fiscal terms. The shorter-cycle times for shelf gas and deep-water prospects near infrastructure complement the longer-cycle times for deep-water, sub-salt plays.

When we first entered the deep-water, we partnered with large experienced operators to improve our skills and understanding. A trade-off of this strategy was not controlling the timing of drilling programs. Our goal is to operate even more of our own deep-water properties and exploration wells so that we can manage the pace of activity. In 2004, we invested $400 million on exploration and development activities to further our strategy. We plan to invest approximately $315 million in 2005.

In 2004, we produced approximately 54,700 boe/d before royalties (47,500 after royalties), representing about 22% of Nexen's total production. Proved reserves of 88 mmboe (103 before royalties) at year-end 2004 were about 20% of Nexen's total proved oil and gas reserves after royalties. Our production and reserves in the Gulf are primarily concentrated in five shallow-water fields and two deep-water fields. We operate most of this production, and hold varying interests on 182 undeveloped federal lease blocks.

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[Margin graphic: US Production before royalties 2002-2004 chart, separated by deep and shallow water]

US PRODUCTION
                                     2004                     2003                     2002
---------------------------------------------------------------------------------------------------
                              Before       After       Before       After       Before       After
(mboe/d)                   Royalties   Royalties    Royalties   Royalties    Royalties   Royalties
                          ----------------------   -----------------------  -----------------------
Shallow-water                   22.6        18.8         28.5        23.7         28.1        23.2
Deep-water                      32.1        28.7         24.0        21.7          0.5         0.5
                          ----------------------   -----------------------  -----------------------
Total                           54.7        47.5         52.5        45.4         28.6        23.7
                          =======================  =======================  =======================

Royalty rates on our US production average 17% for shallow-water volumes and 10% for deep-water volumes. We qualify for royalty relief at our deep-water Aspen and Gunnison fields on the first 87.5 mmboe of production, making this production very attractive. We are subject to royalties at Gunnison if the annual commodity prices are higher than threshold prices set by the US Department of the Interior's Minerals Management Service. Royalties on other Gulf and state-water properties range from 12.5% to 25%. US taxable income is subject to federal income tax of 35% and state taxes ranging from 0% to 8%.

Weather is a risk in the Gulf of Mexico, specifically tropical storms and hurricanes. They can damage facilities, interrupt production, and delay exploration and development programs, beyond the few days of the storm itself. In September 2004, we shut-in 45,000 boe/d of production before royalties for three days, as Hurricane Ivan passed through. No significant damage was sustained at our facilities and full production was restored shortly thereafter. In October 2002, we suffered extensive facilities damage at Eugene Island 295 from Hurricane Lili. Production was restored there in early 2003.

5

SHALLOW-WATER PRODUCTION

Our shelf producing assets are offshore Louisiana primarily in five 100% owned fields: Eugene Island 18, Eugene Island 255/257/258/259, Eugene Island 295, Vermilion 302/320 and Vermilion 76 (consisting of blocks 65, 66 and 67). We continue to exploit these assets, and look for other opportunities on the shelf. Most of our 2004 shelf development operations focused on increasing production at Vermilion 76 and 302/320, through development drilling activities.

DEEP-WATER PRODUCTION

Our deep-water production comes from our 100% operated Aspen field and our 30% non-operated Gunnison field. Our Gunnison SPAR production facility has excess capacity, leaving room for growth from exploration and processing of third-party volumes.

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[Margin text: Aspen achieved payout in just over 2 years.]

ASPEN

Aspen is located on Green Canyon Block 243 in 3,150 feet of water. The project was developed using sub-sea wells tied back to the Shell-operated Bullwinkle platform 16 miles away. Production began in December 2002. By tying-in a third Aspen development well in July 2004, we increased 2004 production by 11,000 boe/d before royalties to 27,200 boe/d before royalties at year-end (24,600 after royalties), of which 14% was natural gas. There are no significant capital plans for Aspen in 2005. We achieved payout on the full Aspen project in early-2005, just over 2 years from first production.

GUNNISON

Gunnison is located in 3,100 feet of water, and includes Garden Banks Blocks 667, 668 and 669. The first discovery was in May 2000 on Garden Banks Block 668, and the second in June 2001 on Garden Banks Block 667.

Gunnison began production in December 2003 through a truss SPAR platform that can handle 40,000 barrels of oil per day and 200 million cubic feet of gas per day. Our share of 2004 production before royalties was approximately 9,300 boe/d (8,200 after royalties). During 2005, we plan to drill and tie-in two additional development wells.

[GRAPHIC OMITTED]
[Graphic: Gunnison SPAR schematic with caption: Our Gunnison SPAR has capacity for future discoveries and third-party volumes.]

EXPLORATION

In 2004, half of our exploration budget was invested in the Gulf. The results in 2004 were mixed with four small discoveries and five abandoned wells:

WELL                  LOCATION                           INTEREST (%)    RESULTS
---------------------------------------------------------------------------------------------------------------------------
Dawson Deep           Garden Banks 625                   15              discovery expected to begin producing late-2005
                                                                         through sub-sea tie-back to Gunnison
Tobago                Alaminos Canyon                    13.34           discovery temporarily abandoned; possibly part of
                      858/859                                            future regional development
Wrigley               Mississippi Canyon                 50              gas discovery expected to begin producing in
                      506                                                mid-2006
Anduin                Mississippi Canyon                 50              encountered oil shows; side-tracking to delineate
                      754/755
Shark                 South Timbalier 174                40              well abandoned
Crested Butte         Green Canyon 242                   100             well abandoned as oil shows were close to salt;
                                                                         further work required to see if side-track
                                                                         warranted
Main Pass 240         Main Pass 240                      45              well abandoned; found non-commercial quantities
Fawkes                Garden Banks 303                   33 1/3          well abandoned; found non-commercial quantities
Wind River            West Cameron 335                   50              well abandoned

In 2004, we also increased our deep-water undeveloped land position to 148 blocks, by acquiring 19 blocks. We expect this acreage, plus new opportunities, to sustain our current level of exploration drilling.

6

We are in the midst of our most active Gulf exploration program ever, with two wells drilling and two more to begin drilling in the first half of 2005. Wells currently drilling with results expected in the first half of 2005 include:

                                                                                     OPERATOR
WELL               LOCATION                                    INTEREST (%)          STATUS             STRATEGY
-----------------------------------------------------------------------------------------------------------------------
Big Bend           Mustang Island A-110                        50                    non-operated       deep-shelf gas
Vrede              Atwater Valley 223/224/267/268              25                    non-operated       deep-water

We expect to drill other deep-shelf gas and deep-water prospects in 2005, the most significant deep-water prospects are at Pathfinder (25% interest) and Knotty Head (25% interest).

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[Margin text: We are in the midst of our strongest Gulf Exploration program ever.]

NORTH SEA - UNITED KINGDOM (UK)

On December 1, 2004, we acquired assets in the UK North Sea for US$2.1 billion in cash subject to certain adjustments. This acquisition was completed by purchasing all outstanding shares of EnCana (UK) Limited. We acquired a 43.2% operated interest in the Buzzard development, operated interests in the Scott and Telford producing fields, the Scott production platform, interests in several satellite discoveries and over 700,000 net undeveloped exploration acres. We also acquired the management and technical teams that found and continue to develop Buzzard. From this acquisition we booked 130 mmboe of proved reserves (130 before royalties) comprising 29% of Nexen's total oil and gas reserves after royalties.

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[Graphic: North Sea map with Nexen's producing and exploration blocks.]

                                              INTEREST        OPERATOR
FIELD              LOCATION                      (%)           STATUS        COMMENTS
-----------------------------------------------------------------------------------------------------------------------
Buzzard            Blocks 19/10, 20/6,           43.2          operated      expected on stream late-2006 ramping up to
                   19/5a, 20/1s                                              80,000 boe/d our share in 2007
Scott              Blocks 15/21a, 15/22          41            operated      producing field with exploitation
                                                                             opportunities
Telford            Blocks 15/21a, 15/22          54.3          operated      producing field with exploitation
                                                                             opportunities
Ettrick            Blocks 20/2a, 20/3a           80            operated      discovery near Buzzard
Farragon           Block 16/28                   20            non-          expected on stream late-2005 at 3,000
                                                               operated      boe/d our share
Perth              Block 15/21a                  42            operated      discovery near Scott
Black Horse        Block 15/22                   56            operated      discovery near Scott
Bugle              Block 15/23d                  80            operated      discovery near Scott

This acquisition establishes us as a significant regional player, with concentrated assets, infrastructure and exploration and development potential for future growth. It will add high-margin reserves and production, diversify our world-wide portfolio by adding strong assets in a stable jurisdiction, and complement the longer cycle-time projects we have in the Athabasca oil sands, offshore West Africa, and the deep-water Gulf of Mexico.

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[Margin text: Our North Sea acquisition establishes us as a significant regional player.]

Our UK strategy is focused on exploration and exploitation near existing infrastructure. We have a number of exploitation opportunities in our existing fields and smaller satellite discoveries close to infrastructure. Most of our unexplored acreage is near Scott/Telford or Buzzard, and could be tied-in quickly upon success.

The Scott field is subject to Petroleum Revenue Tax (PRT), although no PRT is payable until available oil allowances have been fully utilized. No PRT is expected to be payable before 2009. Once payable, PRT is levied at 50% of cash flow after capital expenditures, operating costs and an oil allowance. PRT is applicable to fields receiving development consent prior to March 1993, thereby excluding both the Buzzard and Telford fields. PRT is deductible for corporate income tax purposes. The UK corporate income tax rate is 30% of taxable income. Income from oil and gas activities is also subject to a supplemental charge of 10%. Assuming WTI of US$30/bbl, we do not expect to pay current taxes until 2009. The amount and timing of income taxes payable depends on many factors including price, production and capital investment levels.

7

BUZZARD

Buzzard is one of the largest discoveries in the UK North Sea in recent years. Discovered in 2001, it is in the Outer Moray Firth, central North Sea, approximately 100 km northeast of Aberdeen, in 100 metres of water.

Our Buzzard development involves contractors across Europe building a three bridge-linked platform complex comprising wellhead, production and utilities decks and topsides. The facilities will have capacities of 200,000 bbls/d of oil and 60 mmcf/d of gas. Currently, we anticipate the field will produce through 27 production wells, eight pre-drilled and producing by late-2006. Reservoir pressure will be maintained through an active water-flood program. We estimate peak gross production rates in 2007 at 180,000 bbls/d of oil and approximately 30 mmcf/d of gas, with our share at 80,000 boe/d before royalties.

[GRAPHICS OMITTED]
[Graphic: Buzzard production facilities drawing]

[Margin text: Our share of royalty-free Buzzard production is expected to climb to 80,000 boe/d in 2007.]

Work is well underway to construct jackets and topsides that will form the Buzzard platform installation. At year-end 2004, the development project was over 50% complete, on schedule and on budget. In 2005, we plan to invest $530 million to transport the three jackets to Buzzard, install them, install the wellhead topsides, initiate drilling of the production wells, and install the gas and oil export pipelines. In summer 2006, we plan to install the utilities and production topsides and initiate hook-up and project commissioning.

Oil from Buzzard will be exported via the Forties Pipeline System to the Grangemouth, Scotland refinery. Gas will be exported via the Frigg system to the St. Fergus Gas Terminal in northeast Scotland.

SCOTT / TELFORD

Scott and Telford are both producing fields with additional exploitation opportunities. Scott was discovered in 1987 and began producing in September 1993. Telford was discovered in 1991 and came on stream in 1996. Oil accounts for over 85% of production at Scott and around 50% at Telford.

Oil and gas is produced through numerous subsea wells and from wells drilled from the Scott platform. Oil is delivered to the Grangemouth, Scotland refinery via the Forties pipeline. Gas is exported via the SAGE pipeline to a terminal at St. Fergus in northeast Scotland.

In 2005, we plan to invest approximately $50 million to drill, complete, and tie-in five development wells, work-over several existing wells, and de-bottleneck and upgrade facilities on the Scott platform.

OTHER

We have a number of smaller discoveries on operated blocks near Scott, Buzzard or third-party facilities. Ettrick could be developed using a floating production facility, or tied-in to Buzzard (20 km away) once excess capacity is available. Exploitation projects near Scott such as Perth, Black Horse and Bugle are in various stages of evaluation. Farragon should begin producing in late-2005, with our 20%, non-operated share of production expected to reach between 3,000 and 4,000 boe/d before royalties in early 2006.

In 2005, we plan to drill at least four exploration wells and most are close to Scott/Telford or Buzzard.

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[Margin text: We have a number of smaller discoveries near Scott, Buzzard or third-party facilities.]

8

MIDDLE EAST - YEMEN

Yemen has been Nexen's most significant international region since first production on the Masila Block in 1993. We operate the country's largest oil project and have developed excellent relationships with the government and communities near our operations. Our success and reputation in Yemen opens doors elsewhere in the Middle East and around the world.

Our strategy here is to maximize value from our existing blocks while continuing to search for new fields in deeper horizons. We have two producing blocks:
Masila (Block 14) and East Al Hajr (Block 51). In 2004, we produced 107,300 bbls/d before royalties (53,500 after royalties) of oil, representing approximately 30% of 2004 cash flow. Proved reserves of 80 mmboe (133 before royalties) comprise approximately 18% of Nexen's total proved oil and gas reserves after royalties.

[GRAPHIC OMITTED]
[Graphic: Yemen map showing East Al Hajr block, Masila block, and Ash Shihr terminal]

MASILA BLOCK (BLOCK 14)

We have a 52% working interest in and operate the Masila Project. Our share of 2004 production was 106,200 bbls/d before royalties (52,500 after royalties). After more than 10 years of growth, our Masila fields have started maturing, but significant value still remains. Due to terms in the production sharing agreement, we still expect to generate approximately 40% of the total project cash flow from the remaining 20% of reserves.

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[Margin text: We expect to generate approximately 40% of the total project cash flow from the remaining 20% of the reserves.]

The first successful Masila exploratory well was drilled at Sunah in 1991, with additional discoveries quickly following at Heijah and Camaal. Initial production began in July 1993 with the first lifting of oil in August 1993. Masila Blend oil averages 31(degree) API at very low gas-oil ratios. Most of the oil is produced from the Upper Qishn formation, but we also produce from deeper formations including the Lower Qishn, Upper Saar, Saar, Madbi, Basal Sand, and basement formations.

We are managing our drilling pace to ensure we recover the remaining reserves in the most efficient, cost-effective manner. We still see 150 drillable locations and plan to drill 20 to 40 wells annually. In 2005, we plan to invest approximately $70 million to drill at least 20 wells and test deeper horizons where we have had recent success.

[GRAPHIC OMITTED]
[Graphic: Map of Masila block]

Masila is the largest oil project in Yemen. Each day, approximately 1.9 million barrels of fluid are produced and collected at our Central Processing Facility (CPF) through over 1,000 km of gathering lines. Water is separated at the field or CPF and re-injected via water disposal wells in an environmentally sensitive manner.

[GRAPHIC OMITTED]
[Margin text: Masila is the largest oil project in Yemen.]

Treated oil is pumped from the CPF via 138 km of pipeline to the export terminal at Ash-Shihr. This pipeline ships Masila, East Al Hajr and third-party crude. Oil is stored in one of six tanks (one 1,000,000 barrel tank and five 500,000 barrel tanks). From the tanks, oil travels through a sub-sea pipeline to a pipeline end manifold (PLEM) 4 km offshore in 50 metres of water. The oil moves through the PLEM up to a single point mooring buoy at the water surface and then through two floating pipelines into tankers.

The oil is shipped to primary customers in Asia. Masila Blend crude oil enjoys a strong market due to its quality, reliability of supply and a consolidated marketing approach. During 2004, we sold our Masila crude oil at an average discount of US$4.84/bbl to WTI.

9

Masila production is governed by a Production Sharing Agreement (PSA) signed in 1987 between the Government of Yemen and the Masila joint venture partners (Partners), including Nexen. Under the PSA, we have the right to produce oil from Masila into 2011 and to negotiate a five-year extension. Production is divided into cost recovery oil and profit oil. Cost recovery oil provides for the recovery of all exploration, development, and operating costs which are funded by the Partners. Costs are recovered from a maximum of 40% of production each year, as follows:

COSTS                                     RECOVERY
--------------------------------------------------------------------------------
Operating                                 100% in year incurred
Exploration                               25% per year for 4 years
Development                               16.7% per year for 6 years

The remaining production is profit oil shared between the Partners and the Government and is calculated on a sliding scale based on production. The Partners' share of profit oil ranges from 20 to 33%. The structure of the agreement moderates impact on the Partners' cash flows during periods of low prices. We recover our costs first, and then share any remaining profit oil with the Government. At current production levels, the Government is entitled to approximately 74% of the profit oil, which includes a component for Yemen income taxes payable by the Partners at 35%. In 2004, the Partners' share of Masila production, including recovery of past costs, was approximately 38%.

[GRAPHIC OMITTED]
[Graphic: schematic of Masila Block PSA]

EAST AL HAJR BLOCK (BLOCK 51)

We have an 87.5% working interest in and operate East Al Hajr. The first successful exploratory well was drilled at BAK-A in 2003, with the BAK-B discovery quickly following. Early production began in November 2004 and the field was producing 16,700 bbls/d before royalties at year-end. Full production is expected to grow to 25,000 bbls/d before royalties in mid-2005.

[GRAPHICS OMITTED]
[Graphic: Map of East Al Hajr block]

[Margin text: Full production from Block 51 is expected to grow to 25,000 bbls/d before royalties in mid-2005.]

Development of the BAK-A discovery began in 2004, and will initially include 16 wells, a central processing facility, a gathering system and a 22-km tieback to our Masila export pipeline. Additional development wells are planned throughout 2005. The BAK-B field will initially be developed with seven wells and will come on stream in late-2005.

In 2004, we drilled four exploration wells on the block. The first two wells were abandoned. The third well, BAK-I, encountered oil shows and will be production tested in early 2005 after we source the necessary testing equipment. The fourth exploration well, BAK-J, was suspended after encountering oil and gas shows associated with high formation pressures, and will be re-entered and deepened when suitable equipment is located and high-pressure drilling equipment is sourced.

In 2005, we plan to invest approximately $200 million to complete development of the BAK-A and BAK-B fields and continue exploring the block with four exploration wells.

10

This block is governed by a PSA between the Government of Yemen, and the Partners: The Yemen Company (an entity owned by the Government of Yemen) (12.5% interest) and Nexen (87.5% interest). The PSA expires in 2023 and we have the right to negotiate a five-year extension. Under the terms of the PSA, the Partners pay a royalty ranging from 3 to 10% to the Government depending on production. The remaining production is divided into cost recovery oil and profit oil. Cost recovery oil provides for the recovery of all of the project's exploration, development and operating costs, funded solely by Nexen. Costs are recovered from a maximum of 50% of production each year, as follows:

COSTS                                    RECOVERY
--------------------------------------------------------------------------------
Operating                                100% in year incurred
Exploration                              75% per year, declining balance
Development                              75% per year, declining balance

The remaining production is profit oil that is shared between the Partners and the Government on a sliding scale based on production rates. The Partners' share of profit oil ranges from 20% to 30%. The Government's share of profit oil includes a component for Yemen income taxes payable by the Partners at a rate of 35%.

[GRAPHIC OMITTED]
[Graphic: schematic of Block 51 PSA]

OTHER EXPLORATION BLOCKS

In 2004, we relinquished our interest in exploration Blocks 11, 12, 36, 50, 54, and 59.

OFFSHORE WEST AFRICA

Offshore West Africa is a growing core area where we already have discoveries. It offers prolific reservoirs and multiple opportunities to invest in this oil-rich region. Our strategy here is to explore and develop our portfolio for medium- to long-term growth. We have three exploration projects underway-- OPL-222 and OML-115, offshore Nigeria and Block K, offshore Equatorial Guinea. We are also producing our final barrels from our Ejulebe field, offshore Nigeria.

In 2004, we invested $69 million of capital offshore West Africa, and expect to invest $84 million in 2005.

[GRAPHICS OMITTED]
[Graphic: Map of offshore West Africa showing Nexen production and exploration blocks]

[Margin text: Offshore West Africa is a growing core area where we already have discoveries.]

NIGERIA

BLOCK OML-109 - EJULEBE

Ejulebe is located in 45 feet of water on Block OML-109 in the Niger Delta, approximately 15 km offshore Nigeria. Crude oil production is transported through a pipeline to a third-party owned FPSO (floating production storage and off-loading vessel) where it is made available for sale and export. We operate the block under a risk service contract, requiring us to provide exploration, development and operatorship services and fund all costs in return for a service fee payable out of production from the block.

Ejulebe was still producing at year-end 2004. We expect to sell or abandon it in 2005. Abandonment would begin once government approvals have been obtained. No capital expenditures are proposed for 2005 other than abandonment expenditures.

11

BLOCK OPL-222

In 1998, we acquired a 20% non-operated interest in Block OPL-222, which includes 448,000 acres and is approximately 50 miles offshore in water depths ranging from 600 to 3,500 feet. The ongoing appraisal of the block indicates significant hydrocarbon accumulations based on the drilling results outlined below:

YEAR        WELL        LOCATION                        RESULTS
-----------------------------------------------------------------------------------------------------------------
1998        Ukot-1      Ukot field discovery well       encountered  three  oil-bearing  intervals  and flowed at
                                                        restricted rate of 13,900 bbls/d from two intervals
2002        Usan-1      Usan field discovery well       encountered several oil-bearing intervals and flowed at
                                                        restricted rate of 5,000 bbls/d from one interval
2003        Usan-2      3 km west of discovery          appraised up-dip portion of the fault block
2003        Usan-3      2 km northwest of discovery     appraised  separate  fault block and flowed at restricted
                                                        rate of 5,600 bbls/d from one interval
2003        Ukot-2      3.5 km south of discovery       encountered three oil-bearing intervals
2003        Usan-4      5 km south of discovery         flowed at  restricted  rate of 4,400  bbls/d  from  first
                                                        interval and 6,300 bbls/d from second interval
2004        Usan-5      6 km west of discovery          sampled oil in several intervals
2004        Usan-6      4 km south of Usan-5            flowed  at  restricted  rate of  5,800  bbls/d  from  one
                                                        interval

[GRAPHICS OMITTED]
[Margin Graphic: Map of OPL-222 showing Nexen discoveries and prospects.]

[Margin Text: We have confirmed the presence of commercial quantities of oil on OPL-222.]

Usan-4 confirmed the presence of commercial quantities of crude oil and Usan-5 and Usan-6 have built on this to the west. The operator has applied to convert the block's licence to one or more Oil Mining Leases, which give 20 years to appraise, develop and produce the reserves. A field development plan for Usan is being prepared for submission to the government.

We plan additional exploration drilling on OPL-222 in 2005, and are now determining which prospects will be drilled.

BLOCK OML-115

The Nigerian Government formally approved the Deed of Assignment for OML-115 in December 2003, which assigned us a 40% interest in the block. Under the terms of our Joint Operating Agreement with Oriental Energy Resources Limited, we have a 100% paying interest and are entitled to between 90% and 95% of the revenues for an initial ten-year period. In 2004, we drilled a well on the Ameena prospect and did not find hydrocarbons. We expect to drill our next exploration well on the block in the first half of 2005.

EQUATORIAL GUINEA - BLOCK K

In 2003, we acquired a 25% operated interest in Block K, a deep-water block located 100 km offshore Equatorial Guinea. This interest was later increased to 50%. In 2004, we drilled a well on the Zorro prospect and found non-commercial quantities of hydrocarbons. We expect to drill our next exploration well on the block in the first half of 2005. We plan to meet all of the work commitments under the production sharing contract before the initial exploration period ends on June 1, 2005.

OTHER INTERNATIONAL

COLOMBIA

BOQUERON BLOCK - GUANDO

In 2000, we made our first discovery at Guando on our 20% non-operated Boqueron Block. Boqueron is located in the Upper Magdalena Basin of central Colombia, approximately 45 km southwest of Bogota. Our share of 2004 production averaged 4,800 bbls/d before royalties (4,400 after royalties), about 2% of Nexen's total production.

Production from Guando is subject to a 5% to 25% royalty depending on daily production levels. The corporate income tax rate is 38.5%.

[GRAPHIC OMITTED]
[Graphic: Map of Colombia showing Nexen producing and exploration blocks]

12

EXPLORATION BLOCKS

Exploration activities in Colombia are focused on assessing potential drilling opportunities on captured blocks. In addition to Boqueron, we have interests in three exploration blocks in the Upper Magdalena Basin. Villarrica was acquired in 2000, El Queso in 2003 and Boqueron Deep in 2003.

BLOCK                 INTEREST (%)     OPERATOR STATUS      2004 ACTIVITY
--------------------------------------------------------------------------------------------------------
Boqueron Deep         40               non-operated         shot 80 km of seismic
Villarrica            50               operated             received environmental license for possible
                                                            2005 exploration well
El Queso              50               operated             shot 70 km of seismic

The fiscal policy structure in Colombia was revised in 2004 to make the terms more competitive in the world market. In December 2004, El Queso was recognized under the new terms. The exploration commitments have been completed for the current phase of Villarrica. The seismic acquisition with Phase One at Boqueron Deep is complete, with processing and interpretation activities carrying forward in 2005. The Phase Two commitments at El Queso will be fulfilled in 2005 with the budgeted seismic program.

In 2005, we plan to drill one exploration well and acquire additional seismic information to help identify future drilling opportunities.

AUSTRALIA - BUFFALO

Since first production in 1999, the Buffalo field, offshore northwest Australia, has produced 53(degree) API crude oil using a fixed wellhead platform linked to a leased floating production storage and off-loading vessel.

We produced our final barrel of crude oil in late-2004, and averaged 2,700 bbls/d before royalties of oil for 2004. Field abandonment began in November 2004 and is expected to be completed in 2005. There were no capital expenditures in 2004, and other than abandonment expenditures, no further expenditures are expected in 2005 .

WESTERN CANADA

Our strategy in Canada is to maximize value from our core operations while we actively pursue emerging sources of supply. We continue to manage our mature conventional assets through selective development, cost control and asset dispositions. In 2004, we produced 59,900 boe/d before royalties (47,000 after royalties) from these assets, which was approximately 24% of Nexen's total production. At year-end 2004, proved reserves of 141 mmboe (164 before royalties) were approximately 31% of Nexen's total proved oil and gas reserves after royalties.

Our Canadian operations are concentrated in geographical regions based on commodity:

o light oil--in southeast Saskatchewan and northeast British Columbia;
o heavy oil--in west central Saskatchewan;
o natural gas--near Calgary, in northern Alberta foothills, southeast Alberta and Saskatchewan.

We operate most of our producing properties and hold 1.7 million net acres of undeveloped land across western Canada.

[GRAPHICS OMITTED]
[Margin text: Our Western Canadian strategy is to maximize value from core operations while pursuing emerging sources of supply.]

[Graphic: Map of Western Canada showing Nexen areas of operations.]

The core assets provide predictable production and earnings while we advance initiatives for future growth:

o coal bed methane (CBM) - focusing on Upper Mannville and Horseshoe Canyon coals and applying our experience in shallow gas drilling and water handling techniques
o enhanced oil recovery (EOR) - actively testing enhanced oil recovery technologies to increase recovery in our heavy oil fields.

13

In 2004, we invested $175 million in Canada, with $148 million in our maturing core assets. In 2005, we plan to invest approximately $200 million, with $140 million allocated to our maturing core assets. From 2003 to 2005, we will have doubled our capital investment in CBM and EOR.

In Canada, the federal and provincial governments impose royalties on production at varying rates, ranging between 15% and 40%, from lands where they own the mineral rights. Some provinces also impose taxes on production from lands where they do not own the mineral rights. The Saskatchewan government assesses a resource surcharge on gross Saskatchewan resource sales of 3.6% that is reduced to 2.0% if the well was completed after October 1, 2002.

Profits earned in Canada from resource properties are subject to federal and provincial income taxes. In 2003, legislation was introduced to reduce the federal corporate income tax rate on income from Canadian oil and gas activities from 28% to 21% by 2007. Canadian entities are also subject to capital taxes.

[GRAPHIC OMITTED]
[Margin text: Our Western Canadian production is split: 20% light oil, 40% heavy oil and 40% natural gas.]

LIGHT OIL

Approximately 20% of our Canadian production is light oil.

We continue to develop and exploit our Hay property in northeast British Columbia. We discovered Hay in 1997 and started producing in April 2000. Hay is entering the final stage of development, with our focus on maximizing its value and evaluating remaining reserve potential.

Our operations in southeast Saskatchewan are characterized by mature fields producing medium-depth light oil. In 2004, we drilled 24 gross wells (19 net) as part of our capital program. Our 2005 plans include ongoing exploitation of these fields.

HEAVY OIL

Approximately 40% of our Canadian production is heavy oil.

Heavy oil is characterized by high specific gravity or weight and high viscosity or resistance to flow. Because of these features, heavy oil is more difficult and expensive to extract, transport and refine than other types of oil. Heavy oil also yields a lower price relative to light oil, as a smaller percentage of high value petroleum products can be refined from heavy oil.

Our heavy oil operations are in west central Saskatchewan. To maximize heavy oil returns, it is important to manage finding, development and operating costs. Our large production base and existing infrastructure helps. In 2004, we drilled 63 gross wells (52 net) as part of our capital program. In 2005, we plan to continue exploiting our existing fields through drilling and optimizing operations.

NATURAL GAS

Approximately 40% of our Canadian production is natural gas, produced primarily from shallow sweet reservoirs in southeast Alberta, southwest and northwest Saskatchewan and from deep sour gas near Calgary and in the northern Alberta foothills.

Shallow gas is natural gas produced from thin, shallow sand formations yielding sweet, low-pressure gas. In general, shallower gas targets are cheaper to drill and develop, but have relatively smaller reserves and lower productivity per well. We have been producing sour natural gas from our Balzac field northeast of Calgary since 1961. This sour gas is processed through our operated Balzac plant. We also have natural gas production from our Findley properties in the Alberta foothills and gas production associated with oil wells. In 2005, we expect to drill 126 gross wells (117 net).

Limited gas exploration activity is focused in the foothills of Alberta and in Montana and central Saskatchewan.

COAL BED METHANE (CBM)

CBM is commonly referred to as an unconventional form of natural gas because it is primarily stored through adsorption by coal in coal deposits rather than in the pore space of the rock like most conventional gas. The gas is released in response to a drop in reservoir pressure. If the coal deposit is water saturated, water generally needs to be extracted to reduce the pressure and allow gas production to occur. If the coal does not produce water and is "dry", gas will be produced from initial development. CBM fields are likely to require between two and eight gas wells per section to efficiently extract the natural gas. Regulatory approval is required to drill more than one well per section. As a result, the timing of drilling programs and land development can be uncertain. Water producing CBM wells in the United States generally show increasing gas production rates for a period of approximately one to three years before gas rates begin to decline.

At the end of 2004, our net undeveloped CBM land position was 285,000 acres. Most of this land is in the Fort Assiniboine region of Alberta, where our Corbett pilot project is located. We have also established positions in other prospective CBM areas in Alberta.

14

[GRAPHIC OMITTED]
[Graphic: Alberta map showing Nexen lands and Corbett pilot location.]

Our CBM pilot at Corbett, operated by Trident Exploration, has established techniques to produce natural gas from the wet Upper Mannville coals. Commercial feasibility depends on achieving threshold production levels, which we hope to achieve in 2005. These coals are generally deeper than the Horseshoe Canyon "dry coal" play which is now being commercially developed in Alberta. During 2004, we expanded our Corbett pilot from 15 to 49 producing wells.

In 2005, besides the potential of initiating commercial development at Corbett, we will continue to evaluate other Mannville and Horseshoe Canyon CBM prospects and pursue new opportunities in CBM. Our capital expenditures in 2004 were approximately $30 million, and we plan to invest $45 million on CBM in 2005.

[GRAPHIC OMITTED]
[Margin text: A strong land position is critical to a successful CBM strategy.]

ENHANCED OIL RECOVERY (EOR)

Heavy oil reservoirs typically have lower recovery factors than conventional oil reservoirs, leaving substantial amounts of oil in the ground. This creates an opportunity to increase recovery factors by applying new technology. We are researching various technologies to enhance our heavy oil recovery with ongoing pilot projects in west central Saskatchewan.

ATHABASCA OIL SANDS

Our oil sands strategy is to economically develop our bitumen resource to provide low-risk, stable, future growth. Our strategy involves integrating bitumen production with field upgrading technology to produce a premium synthetic crude oil. Our oil sands strategy also includes our 7.23% investment in the Syncrude oil sands mining operation.

In 2001, we formed a 50/50 joint venture with OPTI Canada Inc. (OPTI Canada) to develop the Long Lake property (Lease 27) using steam-assisted-gravity-drainage (SAGD) for bitumen production and field upgrading with the OrCrude(TM) process, a technology to which OPTI Canada has the exclusive Canadian license. OPTI Canada has since reorganized its interest into OPTI Long Lake L.P. (OPTI). We also acquired from OPTI the exclusive right to use the technology within approximately 100 miles of Long Lake in collaboration with OPTI, and the right to use the technology independently elsewhere in the world.

[GRAPHIC OMITTED]
[Graphic: Alberta map of Nexen bitumen acreage for Long Lake]

We have 199,000 net acres of bitumen-prone lands located in the Athabasca oil sands of northeast Alberta, and plan to continue acquiring more. We plan to develop our bitumen lands in a phased manner using our integrated upgrading strategy. To begin exploiting this resource, we sanctioned and began development of our Long Lake Project in 2004.

In 1995, Alberta announced generic royalty terms for new oil sands projects that provide for a royalty rate of 25% on net revenues after all costs have been recovered, subject to a minimum 1% gross royalty. We expect to be subject to this royalty on our bitumen production and not our upgraded synthetic crude oil production.

[GRAPHIC OMITTED]
[Margin text: We continue to expand our bitumen holdings and plan to develop them in a phased manner using our integrated upgrading strategy.]

15

LONG LAKE PROJECT

Our $3.5 billion Long Lake Project, the fourth and next major integrated oil sands project in Canada, received regulatory approval in 2003. The project consists of approximately 72,000 bbls/d of SAGD bitumen production integrated with a field upgrading facility using the OrCrude(TM) process and commercially available hydrocracking and gasification. The project is expected to produce approximately 60,000 bbls/d of premium synthetic crude oil with low sulphur content once the upgrader is on stream in the second half of 2007. The project is designed to generate its own fuel and electricity, resulting in significant operating cost savings compared to other bitumen production and upgrading projects and significantly lower price risk on input costs. By upgrading the bitumen to synthetic crude oil, we should also avoid price risk on the production. We are the operator of the Long Lake lease and are responsible for construction, development and operation of the SAGD project, while OPTI is responsible for the design, construction and operation of the upgrader. We will share the production and operating costs of the project equally with OPTI.

[GRAPHIC OMITTED]
[Margin text: We expect our share of phase one production from Long Lake to be 30,000 bbls/d of premium synthetic crude oil.]

The SAGD and upgrader integration, along with the proprietary processes, allows us to overcome three main economic hurdles of SAGD bitumen production: 1) cost of natural gas, 2) cost of diluent, and 3) the realized price of bitumen. The Project generates synthetic gas from internally produced asphaltenes for use as fuel. This essentially eliminates the need for purchasing natural gas. With the upgrading facilities located on site, expensive diluent is not required to transport the produced bitumen to market. Upgrading the bitumen into a highly desirable refinery feedstock or diluent supply enables the end product to command significantly higher prices than raw bitumen.

We plan to produce bitumen using SAGD, a proven technology now being commercialized at several locations in the region. SAGD involves drilling two parallel horizontal wells, generally between 2,300 and 3,300 feet in length with about 16 feet of vertical separation. Steam is injected into the shallower well, where it heats the bitumen that then flows by gravity to the deeper producing well. To optimize the project's well design, a three-well pair SAGD pilot was completed and is still operating. We also have interests in other SAGD projects at various stages of assessment outside of Long Lake.

[GRAPHICS OMITTED]
[Margin text: Our SAGD and upgrader integration allows us to limit our exposure to critical variables affecting the economics of SAGD bitumen production:
1) cost of natural gas, 2) cost of diluent, and 3) price of bitumen.]

[Graphic: schematic of SAGD production and well pair]

[Graphic: schematic of SAGD and Upgrader with OrCrude(TM) upgrading process]

16

The OrCrude(TM) technology, using distillation, solvent deasphalting and thermal cracking, converts bitumen into partially upgraded sour crude oil and liquid asphaltenes. By coupling the OrCrude(TM) process with commercially available hydrocracking and gasification technologies, sour crude is upgraded to light (39(degree) API) premium synthetic crude oil and the asphaltenes are converted to a low-energy, synthetic fuel gas containing free hydrogen for use in the upgrading process. The synthetic fuel will be burned in a co-generation plant to produce steam for the SAGD operations and for on-site power. A 500-bbl/d demonstration plant successfully separated asphaltenes and upgraded over 250,000 bbls of various types of bitumen from the Cold Lake and Athabasca regions, including Long Lake bitumen. Combined SAGD, cogeneration, and upgrading operating costs are expected to average between $7 and $9/bbl.

[GRAPHIC OMITTED]
[Margin text: Combined SAGD cogeneration and upgrading costs are expected to average between $7 and $9/bbl.]

On February 12, 2004, our Board of Directors approved proceeding with commercial development of the Long Lake Project. Field construction work on the SAGD and upgrader facilities began in 2004, with above ground construction scheduled to begin in the first half of 2005. Commercial SAGD drilling of 78 well pairs began in September 2004, with expected completion by early 2006. At year-end, procurement of major equipment was substantially complete, with pricing as budgeted. First steam injection is scheduled to commence in 2006 and the upgrader is scheduled to start-up in the second half of 2007. We expect peak gross production to reach around 60,000 bbls/d before royalties of synthetic crude oil. We expect to maintain this rate over the project's life, estimated at 40 years, by periodically drilling additional SAGD well pairs.

We expect the gross capital cost for the Long Lake Project, including upgrader commissioning and start-up to total $3.5 billion ($1.75 billion, net to us). This is $98 million higher ($49 million, net to us) than the estimate at the time of sanctioning as we have accelerated the drilling of 13 well pairs to ensure we have sufficient bitumen supply to fill the upgrader. In 2004, we invested approximately $362 million and expect to invest $765 million in 2005. The spending in 2005 increases substantially because we are entering the construction phase of the commercial facilities. Ongoing sustaining capital is expected to average $2.50/bbl. We estimate the capital costs of producing and upgrading bitumen using this technology will be comparable to those for surface mining and coking upgrading on a barrel of daily production basis.

[GRAPHIC OMITTED]
Margin text: Our share of Long Lake capital costs to upgrader start-up is estimated at $1.75 billion.]

RESERVES, PRODUCTION AND RELATED INFORMATION
In addition to the tables below, we refer you to the Supplementary Data in Item 8 of this Form 10-K for information on our oil and gas producing activities. Nexen has not filed with nor included in reports to any other United States federal authority or agency, any estimates of total proved crude oil or natural gas reserves since the beginning of the last fiscal year.

NET SALES BY PRODUCT FROM CONTINUING OPERATIONS (INCLUDING SYNCRUDE)

(Cdn$ millions)                                       2004      2003      2002
--------------------------------------------------------------------------------
Conventional Crude Oil and Natural Gas Liquids       1,856     1,590     1,374
Synthetic Crude Oil                                    321       240       245
Natural Gas                                            607       618       345
                                                   -----------------------------
                                                     2,784     2,448     1,964
                                                   =============================

Crude oil (including synthetic crude oil) and natural gas liquids represent approximately 78% of our net sales, while natural gas represents the remaining 22%.

SALES PRICES AND PRODUCTION COSTS (EXCLUDING SYNCRUDE)

                                    AVERAGE SALES PRICE (1)   AVERAGE PRODUCTION COSTS (1)
-----------------------------------------------------------   ----------------------------
                                    2004     2003     2002     2004       2003      2002
                                   ------------------------   ----------------------------
Crude Oil and NGLs (Cdn$/bbl)
  Yemen                            47.59    39.45    38.80     5.64       4.37      4.13
  Canada (2)                       36.60    32.37    31.13    11.76      10.00      8.98
  United States                    46.60    37.68    38.88     6.09       5.08     10.95
  Australia (2)                    51.22    43.14    40.30    35.73      20.21     12.14
  United Kingdom                   46.81       --       --     8.26         --        --
  Other Countries                  43.07    38.22    38.96     4.09       9.01     10.69

Natural Gas (Cdn$/mcf)
  Canada (2)                        5.76     5.64     3.57     0.85       0.65      0.70
  United States                     7.89     8.16     5.29     1.02       0.89      1.83
  United Kingdom                    8.28       --       --       --         --        --
                                   ------------------------ -------------------------------

Notes:
(1) Prices and unit production costs are calculated using our working interest production after royalties.
(2) Includes results of discontinued operations. (See Note 11 to our Consolidated Financial Statements).

17

PRODUCING OIL AND GAS WELLS
(number of wells)                                        2004
------------------------------------------------------------------------------------------------
                                OIL                       GAS                     TOTAL
                     ------------------------   ----------------------    ----------------------
                      Gross (1)       Net (2)   Gross (1)      Net (2)    Gross (1)      Net (2)
United States           196           89          208          129          404          218
Yemen                   371          195           --           --          371          195
United Kingdom           27           12           --           --           27           12
Canada                2,831        2,041        2,536        2,201        5,367        4,242
Nigeria                   1            1           --           --            1            1
Colombia                 74           16           --           --           74           16
                     ------------------------   ----------------------    ----------------------
Total                 3,500        2,354        2,744        2,330        6,244        4,684
                      =======================   ======================    ======================

Notes:
(1) Gross wells are the total number of wells in which we own an interest.
(2) Net wells are the sum of fractional interests owned in gross wells.

OIL AND GAS ACREAGE
(thousands of acres)                                       2004
-----------------------------------------------------------------------------------------------
                              DEVELOPED               UNDEVELOPED (1)              TOTAL
                         ------------------        ------------------        ------------------
                         Gross          Net        Gross          Net        Gross          Net
United States              182          102        1,020          494        1,202          596
Yemen (2)                   45           24          761          633          806          657
Nigeria (2), (3), (4)        1            1          524          128          525          129
Equatorial Guinea           --           --        1,106          553        1,106          553
Canada                     909          695        2,754        1,680        3,663        2,375
Colombia (5)                 1           --          787          552          788          552
United Kingdom              44           19        1,598          708        1,642          727
Australia                    1            1           --           --            1            1
                         ------------------        ------------------        ------------------
Total                    1,183          842        8,550        4,748        9,733        5,590
                         ==================        ==================        ==================

Notes:
(1) Undeveloped acreage is considered to be those acres on which wells have not been drilled or completed to a point that would permit production of commercial quantities of crude oil and natural gas regardless of whether or not such acreage contains proved reserves.
(2) The acreage is covered by production sharing contracts.
(3) The acreage is covered by a risk service contract.
(4) The acreage is covered by a joint venture agreement.
(5) The acreage is covered by an association contract.

DRILLING ACTIVITY

(number of net wells)                                 2004
--------------------------------------------------------------------------------------------------------
                                 NET EXPLORATORY                   NET DEVELOPMENT
                     ---------------------------------   ----------------------------------
                                       Dry                                 Dry
                     Productive      Holes       Total   Productive      Holes        Total        Total
United States               0.3        1.8         2.1         11.0        1.0         12.0         14.1
United Kingdom               --         --          --           --         --           --           --
Yemen                        --        2.0         2.0         37.3        0.5         37.8         39.8
Nigeria                     0.4        1.0         1.4           --         --           --          1.4
Canada                     13.4        1.0        14.4        202.9         --        202.9        217.3
Colombia                     --         --          --          7.0         --          7.0          7.0
Equatorial Guinea            --        0.5         0.5           --         --           --          0.5
                     ---------------------------------   -----------------------------------------------
Total                      14.1        6.3        20.4        258.2        1.5        259.7        280.1
                     ==================================  ===============================================

                                                      2003
--------------------------------------------------------------------------------------------------------
                                 NET EXPLORATORY                   NET DEVELOPMENT
                     ---------------------------------   ----------------------------------
                                       Dry                                 Dry
                     Productive      Holes       Total   Productive      Holes        Total        Total
United States                --        0.5         0.5          8.3        0.1          8.4          8.9
Yemen                       8.0        1.0         9.0         49.0         --         49.0         58.0
Nigeria                     0.6         --         0.6           --         --           --          0.6
Canada                     15.4        1.7        17.1        157.7        2.5        160.2        177.3
Colombia                     --        1.0         1.0          6.2         --          6.2          7.2
Brazil                       --        0.2         0.2           --         --           --          0.2
                     ---------------------------------   -----------------------------------------------
Total                      24.0        4.4        28.4        221.2        2.6        223.8        252.2
                     ==================================  ===============================================

18

                                                      2002
--------------------------------------------------------------------------------------------------------
                                 NET EXPLORATORY                   NET DEVELOPMENT
                     ---------------------------------   ----------------------------------
                                       Dry                                 Dry
                     Productive      Holes       Total   Productive      Holes        Total        Total
United States              --          1.4         1.4         14.9        0.6         15.5         16.9
Yemen                      --          0.6         0.6         38.0        1.0         39.0         39.6
Canada                     16.0        4.0        20.0        225.0        8.0        233.0        253.0
Australia                  --         --          --            2.0       --            2.0          2.0
Other Countries (1)         0.2        0.7         0.9          2.0        0.2          2.2          3.1
                     ---------------------------------   -----------------------------------------------
Total                      16.2        6.7        22.9        281.9        9.8        291.7        314.6
                     ==================================  ===============================================

Note:
(1) Other countries include drilling primarily in Nigeria, Colombia and Brazil.

WELLS IN PROGRESS

At December 31, 2004, we were in the process of drilling ten wells (5.7 net) in the United States, 29 wells (15.5 net) in Canada, four wells in Yemen (3.0 net), and one well in Colombia (0.2 net).

SYNCRUDE MINING OPERATIONS

We hold a 7.23% participating interest in Syncrude Canada Ltd. (Syncrude). This joint venture was established in 1975 to mine shallow oil sands deposits using open-pit mining methods, extract the bitumen from the oil sands, and upgrade the bitumen to produce a high-quality, light (32(degree) API), sweet, synthetic crude oil.

The Syncrude operation exploits a portion of the Athabasca oil sands deposit which contains bitumen in the unconsolidated sands of the McMurray formation. Ore bodies are buried beneath 50 to 150 feet of over-burden, have bitumen grades ranging from 4 to 14 weight percent, and ore bearing sand thickness of 100 to 160 feet.

Syncrude's operations are located on eight leases (10, 12, 17, 22, 29, 30, 31, and 34) covering 258,000 acres, 40 km north of Fort McMurray in northeast Alberta.

Syncrude mines oil sands at three mines: Base, North, and Aurora North. These locations are readily accessible by public road. At the Base Mine (lease 17), a dragline, bucket wheel reclaimers, and belt conveyors are used for mining and transporting oil sands. In the North Mine (leases 17 and 22) and in the Aurora North Mine (leases 10, 12, and 34), a truck-and-shovel and hydro-transport system is used.

The extraction facilities, which separate bitumen from oil sands, are capable of processing more than 240 million tons of oil sands per year and about 110 mmbbls of bitumen per year. To extract bitumen, the oil sands are mixed with water to form a slurry. Air and chemicals are added to separate bitumen from the sand grains. The process at the Base Mine uses hot water, steam, and caustic soda to create a slurry, while at the North Mine and the Aurora North Mine the oil sands are mixed with warm water to produce a slurry.

The extracted bitumen is fed into a vacuum distillation tower and two cokers for primary upgrading. The resulting products are then separated into naphtha, light gas oil, and heavy gas oil streams. These streams are hydrotreated to remove sulphur and nitrogen impurities to form light, sweet synthetic crude oil. Sulphur and coke, which are by-products of the process, are stockpiled for possible future sale. In 2004, the upgrading process yielded 0.86 barrels of synthetic crude oil per barrel of bitumen.

[GRAPHICS OMITTED]
[Graphic: Alberta map of Syncrude oil sands leases.]

[Margin text: The quality of Syncrude's synthetic crude oil typically allows it to be sold at a premium to WTI.]

The quality of Syncrude's synthetic crude oil typically allows it to be sold at a premium to WTI. In 2004, about 45% of the synthetic crude oil was sold to Edmonton area refineries and the remaining 55% was sold to refineries in eastern Canada and the mid-western United States.

Electricity is provided to Syncrude from two generating plants: a 270 MW plant and an 80 MW plant. Both plants are located at Syncrude and are owned by the Syncrude participants.

Since operations started in 1978, Syncrude has shipped more than 1.5 billion barrels of synthetic crude oil to Edmonton, Alberta by Alberta Oil Sands Pipeline Ltd. The pipeline was expanded in 2004 to accommodate increased Syncrude production.

19

To the end of 2004, our total investment in the property, plant and equipment, including surface mining facilities, transportation equipment, and upgrading facilities is approximately $1 billion. Based on development plans, our share of future expansion and equipment replacement costs over the next 35 years is expected to be about $1.3 billion.

In 1999, the Alberta Energy and Utilities Board (AEUB) extended Syncrude's operating license for the eight oil sands leases through to 2035. The licence permits Syncrude to mine oil sands and produce synthetic crude oil from approved development areas on the oil sands leases. The leases are automatically renewable as long as oil sands operations are ongoing or the leases are part of an approved development plan. All eight leases are included in a development plan approved by the AEUB. There were no known commercial operations on these leases prior to the start-up of operations in 1978.

Syncrude pays a royalty to the Province of Alberta. Subsequent to 1987, this royalty was equal to 50% of Syncrude's deemed net profits after deduction of capital expenditures. In 1995, the Province announced generic royalty terms for new oil sands projects that provide for a royalty rate of 25% on net revenues after all costs have been recovered, subject to a minimum 1% gross royalty. In 1997, the Province of Alberta and the Syncrude owners agreed to move to the generic royalty terms when the total of all allowed capital costs incurred after December 31, 1995 equalled $2.8 billion (gross). That total was surpassed at the end of 2001.

In 1999, the AEUB approved an increase in Syncrude's production capacity to 465,700 bbls/d. At the end of 2001, Syncrude had increased its synthetic crude oil capacity to 246,500 bbls/d with the development of the Aurora North Mine which involved extending mining operations to a new location about 25 miles north of the main Syncrude site. In 2001, the Syncrude owners approved the third stage of the Syncrude expansion, which will increase capacity to 360,000 bbls/d in 2006. Due to higher engineering, manufacturing, and construction costs, the estimated costs of the Stage 3 expansion have increased from initial estimates of $4.1 billion to $7.8 billion. Nexen's share of the project costs was revised in May 2004 to $565 million, of which $440 million was incurred by year-end 2004. Activities in 2005 are focused on completing the upgrader expansion, as well as spending $415 million (Nexen's share is $30 million) to replace bitumen production capacity that will be lost with the closure of the depleted southwest quadrant of the Base Mine in early 2006.

[GRAPHIC OMITTED]
[Margin text: Syncrude's capacity expansion to 360,000 bbls/d should be complete in 2006.]

In 2004, Syncrude's production of marketable synthetic crude oil was 238,000 bbls/d. Nexen's share was 17,200 bbls/d before royalties.

The following table sets out certain operating statistics for the Syncrude operations:

                                                     2004       2003       2002
-------------------------------------------------------------------------------
Total mined volume (1)
  Millions of tons                                    389        380        375
  Mined volume to oil sands ratio (1)                 2.1        2.3        2.2

Oil sands processed
  Millions of tons                                    188        168        173
  Average bitumen grade (weight %)                   11.1       11.0       11.2

Bitumen in mined oil sands
  Millions of tons                                     21         18         19
  Average extraction recovery (%)                      87         89         90

Bitumen production (2)
  Millions of barrels                                 103         92         98
  Average upgrading yield (%)                          86         86         86

Gross synthetic crude oil shipped (3)
  Millions of barrels                                  87         77         84

Nexen's share of marketable crude oil
  Millions of barrels before royalties                6.3        5.6        6.1
  Millions of barrels after royalties                 6.1        5.5        6.0
                                                   ----------------------------

Notes:
(1) Includes pre-stripping of mine areas and reclamation volumes.
(2) Bitumen production in barrels is equal to bitumen in mined oil sands multiplied by the average extraction recovery and the appropriate conversion factor.
(3) Approximately 1.2% of the produced synthetic crude oil is used internally at Syncrude. The remaining synthetic oil is sold externally.

[GRAPHIC OMITTED]
[Margin text: In 2004, approximately 1.8 tons of oil sand produced 1 barrel of bitumen that was upgraded to 0.86 barrels of synthetic crude oil.]

20

OIL AND GAS MARKETING

Our marketing group sells proprietary and third-party natural gas, crude oil and power in certain regional markets where we have built a solid physical asset base. This includes access to transportation, storage and facilities, as well as crude oil and natural gas we produce or acquire. We optimize the margin on our base business by trading around our access to these physical assets when market opportunities present themselves. We use financial and derivative contracts, including futures, forwards, swaps and options for hedging and for trading purposes.

Our marketing strategy is to:

o obtain competitive pricing on the sale of our own oil and gas production,

o provide market intelligence in support of our oil and gas operations,

o provide superior customer service to producers and consumers, and

o capitalize on market opportunities through low-risk trading based on our transportation and storage capacity.

This strategy aligns with our corporate focus to extract full value from our assets, and provides us with the market intelligence needed to deliver our current and future oil and gas production to market at competitive pricing.

GAS MARKETING
The marketing and trading of natural gas is our marketing division's largest revenue stream. We focus on key regional markets where we have a strategic presence - solid customer relationships, in-depth understanding of the market or established physical trading-based assets. We capture regional opportunities by managing supply, transportation and storage assets for producers and end users. In addition to the fee-for-service income we realize from managing these assets, we generate further net revenue by:

o capitalizing on location spreads (differences in prices between market locations) using our transportation assets, and

o capitalizing on time spreads (differences in price between summer and winter) using our storage assets.

[GRAPHIC OMITTED]
[Margin text: The marketing and trading of natural gas is our marketing division's largest revenue stream.]

We have offices in key regions including Calgary, Detroit and Houston. Our Calgary office provides a variety of services including supply, storage, and transportation management as well as netback pool arrangements and other customer services. Our customers include producers and consumers in Western Canada as well as consumers (including utilities) in Eastern Canada, the Northeastern United States and the US mid-continent. Our Detroit office works closely with Calgary to provide services to our customers. Our presence in Houston has established us in the Gulf Coast region where we have our own production.

We use our access to transportation and storage facilities to optimize returns for ourselves as well as our customers.

[GRAPHIC OMITTED]
[Margin text: We use our access to transportation and storage facilities to optimize returns.]

In 2004, we grew our asset base by acquiring physical gas purchase and sales contracts, as well as natural gas transportation capacity on favourable terms. This gave us access to new producer gas until 2008, as well as pipeline capacity and gas purchase and sales contracts to the end of 2004. The majority of these gas purchase and sales contracts have been renewed to the end of 2005. We also added storage capacity in key regional locations.

Our position as a physical marketer at multiple delivery points in key markets gives us the flexibility to capitalize on time and location spreads. With pipeline capacity, we can move gas from producing regions to take advantage of price differences. We can also use storage capacity to store less expensive summer gas in the ground until the winter heating season arrives.

In addition to transportation and storage assets, we hold financial contracts that allow us to capture profits around time and location spreads. The basis risk we assume on these contracts is based on solid fundamental analysis and in-depth knowledge of regional markets. The risk is managed proactively by our product group teams and monitored closely by our risk group, with regular reporting to management and the Board.

CRUDE OIL MARKETING

Our crude oil business focuses on marketing physical crude oil volumes to end use refiners. The crude oil group markets our own production and over 100,000 bbls/d of third-party field production to refiners from producing regions where we operate. In addition to physical marketing, we take advantage of quality differentials and time spreads.

Our North American operations focus on key regions supported by our offices in Calgary and Houston. In Western Canada, our producer services group concentrates on the procurement of a diversified supply base, while the trading team seeks to optimize the mix for sale to refiners. Traditionally, the

21

Chicago area has been the key market for Western Canadian crude. The recent growth in our deep-water Gulf of Mexico crude oil production has given us the opportunity to expand our presence in that market through our Houston office.

Internationally, we focus on the physical marketing of our Yemen crude oil. In order to meet customer needs, we may occasionally market other regional crude types. In addition to our own crude, we market production for our partners and third parties in the Yemen region. By locating our international crude oil marketing office in Singapore, we are well positioned to serve both the producing region and the Asian refining market.

[GRAPHIC OMITTED]
[Margin text: Our international marketing group focuses on the physical marketing of our Yemen crude oil.]

Our crude oil marketing group also holds financial contracts that allow us to capture trading profits around time, quality and location spreads. The basis risk assumed is, like gas marketing, based on solid fundamental analysis and proprietary knowledge of regional markets, and it is managed and monitored closely by our risk group.

POWER MARKETING

Our power marketing group is responsible for optimizing the use of our 100 MW gas-fired combined-cycle power generation facility at Balzac, Alberta and for marketing power to larger commercial, industrial and municipal clients within Alberta. Our Balzac facility began operations in 2001. We expect to increase our power generation capacity with a 170 MW co-generation facility at Long Lake in 2007, and through our 70 MW Soderglen wind power project in southern Alberta in 2006. We have a 50% interest in each project.

CHEMICALS

We manufacture sodium chlorate and chlor-alkali products (chlorine, caustic soda and muriatic acid) in Canada and Brazil. This production is sold in North and South America, with a small amount of sodium chlorate distributed in Asia. Our manufacturing facilities are modern, reliable, and strategically located to capitalize on competitive power costs or transportation infrastructure to minimize production and delivery costs. This enables us to have reliable supplies and low costs, key factors for marketing bleaching chemicals.

The bleaching chemicals we produce are subject to commodity pricing structures. Our strategy for adding value in this business focuses on:

o improving our cost position,

o maintaining our market share,

o building a strong, sustainable North American customer base, and

o capturing new offshore opportunities.

Since 1999, we have made significant investments to grow our capacity, expand internationally and lower our overall cost structure, allowing us to improve our position in the bleaching chemicals industry.

The primary raw materials required to produce sodium chlorate and chlor-alkali products are electricity, salt, and fresh water. Electricity is the single largest operational cost, making up more than half of our cash costs. Labour is also a significant component of our manufacturing costs. Approximately 50% of our workforce is unionized, with collective agreements in place at all of our unionized plants.

[GRAPHIC OMITTED]
[Margin text: Our chemical facilities are modern, reliable, and strategically located to capitalize on competitive power costs or transporatation infrastructure.]

AVERAGE ANNUAL PRODUCTION CAPACITY

                                                   2004        2003        2002
--------------------------------------------------------------------------------
Sodium Chlorate (short-tons)
   North America                                446,617     432,812     500,650
   Brazil                                        70,213      70,213      57,320
                                              ----------------------------------
Total                                           516,830     503,025     557,970
                                              ==================================

Chlor-alkali (short-tons)
   North America                                356,002     356,002     351,844
   Brazil                                       109,430     109,430      97,462
                                              ----------------------------------
Total                                           465,432     465,432     449,306
                                              ==================================

22

NORTH AMERICA
[GRAPHIC OMITTED]
[Graphic: Canada map of chemical plant locations]

The North American pulp and paper industry consumes approximately 95% of local sodium chlorate production. We market our sodium chlorate production to numerous pulp and paper mills under multi-year contracts that contain price and volume provisions. Approximately 30% of this production is sold in Canada, 60% in the US, and the rest marketed offshore.

We are the third largest manufacturer of sodium chlorate in North America with five Canadian facilities: Nanaimo, British Columbia; Bruderheim, Alberta; Brandon, Manitoba; Amherstburg, Ontario; and Beauharnois, Quebec.

In October 2004, we completed an expansion of our Brandon, Manitoba plant by increasing capacity 33% to 260,000 tonnes per year. This expansion replaced higher-cost capacity idled in 2002 at Taft, Louisiana. Brandon is currently the world's largest sodium chlorate facility, and has one of the lowest cost structures in the industry, significantly enhancing our competitive position in North America.

[GRAPHIC OMITTED]
[Margin comment: Our Brandon plant is the world's largest sodium chlorate plant and one of the lowest cost producers in North America.]

Our chlor-alkali facility at North Vancouver, British Columbia manufactures caustic soda, chlorine and muriatic acid. Almost all of our caustic soda is consumed by local pulp and paper mills, while our chlorine is sold to various customers in the polyvinyl chloride, water purification and petrochemicals industries, primarily in the United States.

BRAZIL

We entered Brazil in 1999 by acquiring a sodium chlorate plant and a chlor-alkali plant from Aracruz Cellulose S.A., the leading Brazil manufacturer of pulp. The majority of the production is sold to Aracruz under a long-term sales agreement that expires in 2024. This agreement has an initial six year take-or-pay component that ends in 2005. Most of the chlorine and about 20% of the sodium chlorate production is sold in the merchant market under shorter-term contractual arrangements. In 2002, we completed expanding both facilities to meet Aracruz's growing needs. Chlorate production capacity is now 70,213 short-tons per year and chlor-alkali capacity is 109,430 short-tons per year.

ADDITIONAL FACTORS AFFECTING BUSINESS See Item 7 of this Form 10-K.

GOVERNMENT REGULATIONS

Our operations are subject to various levels of government controls and regulations in the countries in which we operate. These laws and regulations include matters relating to land tenure, drilling, production practices, environmental protection, marketing and pricing policies, royalties, various taxes and levies including income tax, and foreign trade and investment, all of which are subject to change from time to time. Current legislation is generally a matter of public record, and we are unable to predict what additional legislation or amendments may be proposed that will affect our operations or when any such proposals, if enacted, might become effective. However, we participate in many industry and professional associations and otherwise monitor the progress of proposed legislation and regulatory amendments.

ENVIRONMENTAL REGULATIONS

Our oil and gas and chemical operations are subject to government laws and regulations designed to protect and regulate the discharge of materials into the environment in the countries where we operate. We believe that our operations comply in all material respects with applicable environmental laws. To mitigate our exposure we apply industry standards, codes and best practices to meet or exceed these laws and regulations. From time to time, we may conduct activities in countries where environmental regulatory frameworks are in various stages of evolution. Where regulations are lacking, we observe Canadian standards where applicable, as well as internationally accepted industry environmental management practices.

We have an active Safety, Environment and Social Responsibility group that are responsible for ensuring that our worldwide operations are conducted in a safe, ethical and socially responsible manner. We have developed policies for continuing compliance with environmental laws and regulations in the countries in which we operate.

23

ENVIRONMENTAL PROVISIONS AND EXPENDITURES

The ultimate financial impact of environmental laws and regulations is not clearly known nor can they be reasonably estimated as new standards continue to evolve in the countries in which we operate. We estimate our future environmental costs based on past experience and current regulations. At December 31, 2004, $468 million ($770 million, undiscounted) has been provided in our consolidated financial statements for asset retirement obligations relating to our oil and gas, Syncrude and chemicals facilities. During 2004, we increased our retirement obligations for future dismantlement and site restoration by $146 million primarily due to the acquisition of oil and gas properties in the North Sea.

During 2004, our capital expenditures for environmental-related matters, including environment control facilities, were approximately $31 million. Our operating expenditures for environmental-related matters were approximately $8 million. Environmental related and site restoration capital expenditures in 2005 are expected to be approximately $47 million, primarily from the remediation of our Australia and Nigeria oil producing areas.

EMPLOYEES

We had 3,247 employees on December 31, 2004.

Information on our executive officers is presented in Item 10 of this report.

[GRAPHIC OMITTED]
[Margin text: See page 125 for details on our executive officers.]

ITEM 3. LEGAL PROCEEDINGS

There are a number of lawsuits and claims pending against Nexen, the ultimate results of which cannot be ascertained at this time. Management is of the opinion that any amounts assessed against us would not have a material adverse effect upon our consolidated financial position or results of operations. We believe we have made adequate provisions for such lawsuits and claims.

Certain of our US oil and gas operations have received, over the years, notices and demands from the United States Environmental Protection Agency, state environmental agencies, and certain third parties with respect to certain sites seeking to require investigation and remediation under federal or state environmental statutes. In addition, notices, demands, and suits have been received for certain sites related to historical operations and activities in the US for which, although no assurances can be made, we believe that certain assumption and indemnification agreements protect our US operations from any present or future material liabilities that may arise from these particular sites.

On June 25, 2003, a subsidiary of Occidental Petroleum Corporation (Occidental) initiated a request for arbitration at the International Court of Arbitration of the International Chamber of Commerce regarding an Area of Mutual Interest Agreement (Agreement) in the Republic of Yemen. Pursuant to the Agreement, if Nexen proposed to conduct petroleum development operations within two small areas of Block 51 in the Republic of Yemen (Heijah/Tawila Extension Lands), then we were to offer Occidental the right to acquire 50% of our interest in those areas. The Agreement expired on March 12, 2003, with Nexen not having proposed any such operations. Occidental seeks a claim for declaratory relief under the Agreement, claims compensation for breach of contract (50% of the net profits earned or to be earned from the Heijah/Tawila Extension Lands), plus interest and costs. Subsequent to the expiry of the Agreement, we commenced exploration activities within Block 51, including the Heijah/Tawila Extension Lands and, in December 2003, filed a notice of commercial discovery with the Yemen government. Given that the agreement expired without Nexen having proposed to conduct petroleum development operations, we believe Occidental's claim is without merit and we are vigorously defending our contractual rights.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

No matters were submitted to a vote of Nexen's security holders during the fourth quarter of 2004.

24

PART II

ITEM 5. MARKET FOR THE REGISTRANT'S COMMON SHARES AND RELATED STOCKHOLDER MATTERS

Nexen's common shares are traded on the Toronto Stock Exchange (TSX) and the New York Stock Exchange (NYSE) under the symbol NXY.

On December 31, 2004, there were 1,329 registered holders of common shares and 129,199,583 common shares outstanding. The number of registered holders of common shares is calculated excluding individual participants in securities positions listings. During the year, we made no purchases of our own equity securities.

[GRAPHIC OMITTED]
[Margin text: Symbol: NXY, Traded on the TSX and NYSE with 129.2 million common shares outstanding.]

TRADING RANGE OF NEXEN'S COMMON SHARES

($/share) TSX (CDN$) NYSE (US$)

--------------------------------------------------------------------------------
                                              HIGH      LOW        HIGH      LOW
2004
   First Quarter                             53.35    45.00       40.61    34.10
   Second Quarter                            56.50    46.80       42.29    34.49
   Third Quarter                             53.70    44.34       42.13    33.88
   Fourth Quarter                            58.66    48.17       46.56    39.20

2003
   First Quarter                             34.85    29.30       22.55    19.89
   Second Quarter                            35.59    28.26       26.31    19.75
   Third Quarter                             39.68    33.02       29.00    24.03
   Fourth Quarter                            47.08    36.65       36.47    27.32
                                           -------------------------------------

[GRAPHIC OMITTED]
[Margin text: On the TSX in 2004, we traded from a

 low of $44.34 in Q3 to a high of
 $58.66 in Q4.]

QUARTERLY DIVIDENDS ON COMMON SHARES         FIRST     SECOND     THIRD   FOURTH
($/share)                                  QUARTER    QUARTER   QUARTER  QUARTER
--------------------------------------------------------------------------------
2004                                          0.10       0.10      0.10     0.10
2003                                         0.075      0.075     0.075     0.10
                                         ---------------------------------------

[GRAPHIC OMITTED]
[Margin text: We increased our quarterly dividend to $0.10/share in Q4 2003.]

Payment date for dividends was the first day of the next quarter.

The Income Tax Act of Canada requires us to deduct a withholding tax from all dividends remitted to non-residents. In accordance with the Canada-US Tax Treaty, we have deducted a withholding tax of 15% on dividends paid to residents of the United States, except in the case of a company that owns at least 10% of the voting stock where the withholding tax is 5%.

The Investment Canada Act requires that a "non-Canadian" (as defined) file notice with Investment Canada and obtain government approval prior to acquiring control of a "Canadian business" (as defined). Otherwise, there are no limitations, either under the laws of Canada or in Nexen's charter on the right of a non-Canadian to hold or vote Nexen's securities.

On February 3, 2000, at a Special Meeting of Shareholders, a Shareholder Rights Plan was approved. On May 2, 2002, at the Annual General and Special Meeting of Shareholders, an Amended and Restated Shareholder Rights Plan (Plan) was approved. The Plan creates a right, which attaches to each present and future outstanding common share. Each right entitles the holder to acquire additional common shares during the term of the right. Prior to the separation date, the rights are not separable from the common shares and no separate certificates are issued. The separation date would typically occur at the time of an unsolicited takeover bid, but our Board can defer the separation date.

The Plan creates a right, which can only be exercised when a person acquires 20% or more of our common shares (a Flip-In Event), for each shareholder, other than the 20% buyer, to acquire additional common shares at one-half of the market price at the time of exercise. The Plan must be reapproved by shareholders on or before our annual general meeting in 2005 to remain effective past that date.

25

ITEM 6. SELECTED FINANCIAL DATA

FIVE-YEAR SUMMARY OF SELECTED FINANCIAL DATA IN ACCORDANCE WITH US GAAP

(Cdn$ millions)                                       2004          2003         2002        2001        2000
--------------------------------------------------------------------------------------------------------------
RESULTS OF OPERATIONS
   Net Sales (1)                                     3,176         2,844        2,341       2,356       1,366

   Net Income from Continuing Operations               775           462          299         340         474
   Basic Earnings per Common Share
     from Continuing Operations ($/share)             6.03          3.73         2.45        2.82        3.79
   Diluted Earnings per Common Share
     from Continuing Operations ($/share)             5.95          3.70         2.41        2.78        3.74

   Net Income                                          788           420          352         365         522
   Basic Earnings per Common Share ($/share)          6.13          3.39         2.88        3.03        4.17
   Diluted Earnings per Common Share ($/share)        6.05          3.36         2.84        2.99        4.12

   Production before Royalties (mboe/d) (2)            250           269          269         268         256
   Production after Royalties (mboe/d) (2)             174           185          176         184         171

FINANCIAL POSITION
   Total Assets (2)                                 12,339         7,703        6,764       5,609       5,874
   Long-Term Debt (3)                                4,214         2,470        2,575       2,242       2,238
   Shareholders' Equity                              2,892         2,131        1,812       1,414       1,050

   Capital Investment, including Acquisitions        4,264         1,432        1,545       1,325         841

   Dividends per Common Share ($/share) (4)           0.40         0.325         0.30        0.30        0.30

   Common Shares Outstanding (thousands)           129,200       125,606      122,966     121,202     119,855
                                                 ------------------------------------------------- -----------

Notes:
(1) During 2003, we sold non-core conventional light oil assets in southeast Saskatchewan in Canada producing 9,000 bbls/d. In late 2004, we concluded production from our Buffalo field, offshore Australia as anticipated. The results of these operations have been shown as discontinued operations.

(2) In 2003, production increased from our deep-water Aspen development in the Gulf of Mexico in the United States. In 2004, production declined from our maturing assets in Yemen at Masila, in Canada, and in the United States on the Gulf of Mexico Shelf. In late 2004, we acquired North Sea assets and commenced production from Block 51 in Yemen.

(3) In December 2004, we drew US$1,500 million on unsecured acquisition credit facilities to finance the purchase of North Sea assets. The remainder of the purchase price was funded from cash on hand.

(4) Quarterly dividends were increased to 10(cent) per share in the fourth quarter of 2003.

[GRAPHIC OMITTED]
[Margin text: See page 108 for differences between Canadian & US GAAP.]

26

MD&A

[GRAPHIC OMITTED]
[Graphic Image: Masila Block, Yemen]

27

ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

TABLE OF CONTENTS

PAGE

Executive Summary of 2004 Results.............................................29
Capital Investment............................................................31
       2004 Investment Program................................................31
       2005 Estimated Capital.................................................32
Financial Results
       Year to Year Change in Net Income......................................35
       Oil & Gas and Syncrude
               Production  ...................................................36
               Commodity Prices...............................................39
               Operating Costs................................................42
               Depreciation, Depletion, Amortization and Impairment...........43
               Exploration Expense............................................44
       Oil & Gas and Syncrude Netbacks........................................45
       Oil and Gas Marketing..................................................46
       Chemicals .............................................................48
       Corporate Expenses.....................................................49
       Impact of Foreign Exchange on Operations...............................51
Outlook for 2005..............................................................51
Liquidity and Capital Resources...............................................53
Business Risk Management .....................................................58
Critical Accounting Estimates.................................................64
New Accounting Pronouncements.................................................67

THE FOLLOWING SHOULD BE READ IN CONJUNCTION WITH THE CONSOLIDATED FINANCIAL STATEMENTS INCLUDED IN THIS REPORT. THE CONSOLIDATED FINANCIAL STATEMENTS HAVE BEEN PREPARED IN ACCORDANCE WITH GENERALLY ACCEPTED ACCOUNTING PRINCIPLES (GAAP) IN CANADA. THE IMPACT OF SIGNIFICANT DIFFERENCES BETWEEN CANADIAN AND UNITED STATES (US) ACCOUNTING PRINCIPLES ON THE FINANCIAL STATEMENTS IS DISCLOSED IN
NOTE 19 TO THE CONSOLIDATED FINANCIAL STATEMENTS. THE DATE OF THIS DISCUSSION IS

FEBRUARY 7, 2005.

UNLESS OTHERWISE NOTED, TABULAR AMOUNTS ARE IN MILLIONS OF CANADIAN DOLLARS. OUR DISCUSSION AND ANALYSIS OF OUR OIL AND GAS ACTIVITIES WITH RESPECT TO OIL AND GAS VOLUMES, RESERVES AND RELATED PERFORMANCE MEASURES IS PRESENTED ON A WORKING INTEREST BEFORE-ROYALTIES BASIS. WE MEASURE OUR PERFORMANCE IN THIS MANNER CONSISTENT WITH OTHER CANADIAN OIL AND GAS COMPANIES. WHERE APPROPRIATE, WE HAVE PROVIDED INFORMATION ON AN AFTER-ROYALTY BASIS IN TABULAR FORMAT.

NOTE: CANADIAN INVESTORS SHOULD READ THE SPECIAL NOTE TO CANADIAN INVESTORS ON PAGE 72 WHICH HIGHLIGHTS DIFFERENCES BETWEEN OUR RESERVE ESTIMATES AND RELATED DISCLOSURES THAT ARE OTHERWISE REQUIRED BY CANADIAN REGULATORY AUTHORITIES.

28

EXECUTIVE SUMMARY OF 2004 RESULTS

(Cdn$ millions)                                           2004     2003     2002
--------------------------------------------------------------------------------
Net Income                                                 793      578      409
Earnings per Common Share ($/share)                       6.17     4.67     3.34
Cash Flow from Operating Activities                      1,607    1,405    1,250

Production before Royalties (mboe/d) (1)                   250      269      269
Production after Royalties (mboe/d)                        174      185      176

Capital Investment, including Acquisitions               4,264    1,494    1,625

Net Debt (2)                                             4,219    1,690    2,527
Average Foreign Exchange Rate (Canadian to US dollar)     0.77     0.71     0.64
                                                         -----------------------

Notes:
(1) Production before royalties reflects our working interest before royalties and includes production of synthetic crude oil from Syncrude. We have presented our working interest before royalties as we measure our performance on this basis consistent with other Canadian oil and gas companies.

(2) Long-term debt less net working capital.

[GRAPHIC OMITTED]
[Margin graph: Graph: Net Income (Cdn$ millions)]

In 2004, we had our best year ever financially. Strong oil and gas prices, outstanding results from marketing, and late-year production additions in Yemen and the North Sea fuelled our financial results. A stronger Canadian dollar, declining base production and increasing costs moderated these results. Nevertheless, net income has almost doubled since 2002. Over the same period, our average realized oil and gas price only increased 28%. This is, in part, the result of a strategic transition towards higher margin production, particularly in the deep-water Gulf of Mexico where we have added over 30,000 boe/d of low-royalty, low-cost production since 2002.

Margin text: Record financial results were fuelled by strong prices, outstanding marketing results and new production from Yemen and the North Sea.

WTI averaged US$41.40/bbl in 2004, with crude oil prices spiking to new levels throughout the year. The gains made from high prices were partially offset by a strengthening Canadian dollar, relative to the US dollar. Our foreign revenues and realized commodity prices were impacted when translated into Canadian dollars, reducing cash flow from operating activities by $200 million and our net income by $105 million.

To a lesser extent, the strengthening dollar positively affected our results. Our foreign operating costs and capital expenditures were reduced when translated into Canadian dollars. Additionally, most of our debt is US dollar denominated, so the Canadian dollar debt equivalent was also decreased.

In total, we invested $4.3 billion in 2004 and made significant progress on the many longer-cycle time development projects in our portfolio. In the Athabasca oil sands, the Syncrude Stage 3 expansion is on schedule for production start-up in mid-2006 and our Long Lake Project is on budget and on schedule to commence bitumen production in 2006 and upgrading operations in 2007. In Yemen, production from the BAK-A field on Block 51 came on stream in November, just 11 months after sanctioning and we had encouraging results from our exploration program on the block. Offshore West Africa, drilling on OPL-222, offshore Nigeria, resulted in a significant extension of the Usan discovery. We also began exploration of OML-115, offshore Nigeria, and Block K, offshore Equatorial Guinea.

In the fourth quarter, we acquired EnCana Corporation's UK North Sea assets for US$2.1 billion in cash, subject to certain adjustments. The assets include the Buzzard development, Scott and Telford producing fields, several undeveloped discoveries, over 700,000 net exploratory acres and the team that built these assets.

[GRAPHIC OMITTED]
[Margin text: Our US$2.1 billion North Sea acquisition establishes a new core area for us.]

This acquisition creates a new core area for us. The Buzzard development is currently on schedule to deliver oil volumes in late-2006. Scott and Telford are currently producing approximately 19,000 boe/d before royalties and there are opportunities in these fields and surrounding acreage to increase production over the next few years.

29

In 2004, we saw production increases from our deep-water Gulf of Mexico properties, Syncrude, and late-year contributions from Block 51, Scott and Telford--all higher margin assets. However, these increases were not able to overcome the declines from our maturing asset base at Masila in Yemen, in Canada, and in the shallow-water Gulf of Mexico. We reached final production from our Buffalo field in Australia in the fourth quarter. In addition, our 2003 production volumes included 6,200 boe/d before royalties of production relating to Canadian assets sold in August 2003.

We added 123 mmboe of proved oil and gas reserves after royalties, including 13 million barrels relating to our Syncrude operations. Most of these additions related to the North Sea acquisition and Syncrude expansion, offset by some negative revisions in Yemen and Canada. At our Long Lake oil sands project, SEC regulations require us to represent bitumen reserves for this project rather than upgraded synthetic crude oil reserves we plan to sell from the lease. As a result, we recognized 241 million barrels of proved bitumen reserves on sanctioning. At year-end, low bitumen prices and high diluent and natural gas prices resulted in the write-off of our proved bitumen reserves. However, our Long Lake Project is designed to produce and upgrade bitumen into high-quality synthetic crude oil in a fully integrated process which requires no diluent or purchased natural gas. As a result, the economic returns from this process are not dependent on bitumen, diluent and natural gas prices. This write-off has no impact on our decision to proceed with this project.

[GRAPHIC OMITTED]
[Margin text: We added 123 mmboe of proved reserves after royalties, mostly in the North Sea and at Syncrude. No proved reserves were booked at Long Lake.]

We financed our North Sea acquisition with cash on hand and bridge financing facilities, increasing our net debt by about $2.6 billion. Historically, we have used leverage to finance major expansions of our business, such as the Yemen Masila project in 1993, the Wascana acquisition in 1997, and the Aspen acquisition in 2002. In all cases, we have successfully used cash flow from these assets to subsequently reduce our net debt. In 2005, we plan to reduce net debt with approximately $1.5 billion in asset dispositions.

Our planned 2005 capital program of $2.6 billion is focussed on progressing our major development projects and drilling over 20 high-potential exploration wells in the Gulf of Mexico, offshore West Africa, North Sea and in Yemen. Less than 20% will be re-invested in our core assets to sustain production and cash flow.

Going forward, we are well positioned for growth. At the end of 2004, we had over $3 billion of capital invested in multi-year development projects not yet producing oil or cash flow. This amount is expected to peak in late-2006 at approximately $5 billion, as we bring Buzzard and Long Lake on-stream. We expect net debt to decrease significantly once these projects start contributing cash flow in late-2006 and in 2007, respectively.

[GRAPHIC OMITTED]
[Margin text: By late-2006, we'll have almost $5 billion invested in multi-year projects not yet producing oil or cash flow.]

Our share of incremental production and cash flow from this investment is expected to be significant. Block 51 in Yemen is expected to reach close to 25,000 bbls/d before royalties, in mid-2005. Syncrude's Stage 3 expansion is expected to come on stream in early-2006 adding an incremental 8,000 bbls/d before royalties. Buzzard is on schedule for production start-up planned for late-2006 with production ramping up to 80,000 boe/d before royalties in 2007. At Long-Lake, bitumen production is planned to begin in late-2006. In the second half of 2007, this bitumen will be upgraded to 30,000 bbls/d of premium synthetic crude oil when the upgrader comes on stream. Later in the decade, we expect to see significant new production volumes from OPL-222, offshore Nigeria.

Overall, we expect our oil and gas production before royalties to grow to between 300,000 and 350,000 boe/d in 2007, after projected asset sales and base declines. We have assumed exploration success contributes little volume to these estimates.

Most of our new production is subject to little or no royalty payments and generates significantly higher cash margins than our current production. As a result, we expect our production after royalties to grow to between 260,000 and 300,000 boe/d in 2007.

[GRAPHIC OMITTED]
[Margin text: In 2007, we expect to produce between 300,000 and 350,000 boe/d before royalties.]

30

CAPITAL INVESTMENT

                                                          ESTIMATED
(Cdn$ millions)                                                2005          2004        2003
---------------------------------------------------------------------------------------------
New Growth Development                                        1,675           682         358
New Growth Exploration                                          435           266         329
Core Asset Development                                          435           634         589
                                                          -----------------------------------
                                                              2,545         1,582       1,276
Acquisitions                                                     --         2,587         164
                                                          -----------------------------------
Total Oil & Gas and Syncrude                                  2,545         4,169       1,440
Chemicals, Marketing and Other                                   50            95          54
                                                          -----------------------------------
Total Capital                                                 2,595         4,264       1,494
                                                          ===================================

Our strategy and capital programs are focused on growing long-term value for shareholders. To maximize value, we invest in:

o core assets for short-term production and free cash flow to fund ongoing capital programs and repay debt;

o development projects that convert our discoveries into new production and cash flow; and

o exploration projects for longer-term growth.

As conventional basins in North America mature, we are transitioning our operations towards less mature basins and unconventional resources in more mature basins. These include the North Sea, Athabasca oil sands, Gulf of Mexico, offshore West Africa and the Middle East - basins which we believe have attractive fiscal terms and significant remaining opportunity.

[GRAPHIC OMITTED]
[Margin text: Our capital program supports short, mid and long-term growth.]

[Margin text: We are shifting our capital: investing less in maturing core assets and more in attractive multi-year projects.]

2004 INVESTMENT PROGRAM

In 2004, we invested almost $4.3 billion, comprising $1.7 billion in capital expenditures and $2.6 billion related to our North Sea acquisition. Excluding this acquisition, most of our capital was invested in multi-year development projects and long cycle-time exploration. Here is the breakdown of our capital investment:

                                       NEW GROWTH       NEW GROWTH      CORE ASSET
(Cdn$ millions)                       DEVELOPMENT      EXPLORATION     DEVELOPMENT     TOTAL
---------------------------------------------------------------------------------------------
Oil and Gas
   Synthetic (mainly Long Lake)               343               19              --       362
   North Sea                                   46                4               7        57
   Yemen                                      112               19             155       286
   United States                               --              133             267       400
   Canada                                      17               27             131       175
   Other Countries                             --               64              24        88
Syncrude                                      164               --              50       214
                                            -------------------------------------------------
                                              682              266             634     1,582

Chemicals                                      --               --              58        58
Marketing, Corporate and Other                 --               --              37        37
                                            -------------------------------------------------
Total Capital                                 682              266             729     1,677
                                            =================================================
As a % of Total Capital                        41%              16%             43%      100%
                                            -------------------------------------------------

[GRAPHIC OMITTED]
[Chart: 2004 Capital and 2005 Estimated Capital.]

31

2005 ESTIMATED CAPITAL

In 2005, we are managing our largest development and exploration program ever. We plan to invest over $2.5 billion on our oil and gas and Syncrude assets before considering the impact of dispositions. Around 65% of this is focused on multi-year development projects, with the remainder split equally between new growth exploration and our core assets.

                                       NEW GROWTH       NEW GROWTH      CORE ASSET
(Cdn$ millions)                       DEVELOPMENT      EXPLORATION     DEVELOPMENT     TOTAL
---------------------------------------------------------------------------------------------
Oil and Gas
   Synthetic (mainly Long Lake)               765               --              --       765
   North Sea                                  590               50              45       685
   Yemen                                      200               --              70       270
   United States                               --              215             100       315
   Canada                                      --               60             140       200
   Other Countries                             --              110              25       135
Syncrude                                      120               --              55       175
                                      -------------------------------------------------------
                                            1,675              435             435     2,545

Chemicals                                      --               --              17        17
Marketing, Corporate and Other                 --               --              33        33
                                      -------------------------------------------------------
Total Capital                               1,675              435             485     2,595
                                      =======================================================
As a % of Total Capital                       65%              17%             18%      100%
                                      -------------------------------------------------------

[GRAPHIC OMITTED]
[Margin text: We'll invest over 80% of 2005 capital on major projects and exploration.]

NEW GROWTH DEVELOPMENT

LONG LAKE PROJECT

Almost half our new growth development capital is being invested at Long Lake. The project remains on schedule and on budget. Drilling of the commercial SAGD wells began in late-2004 and will continue throughout 2005. Construction of the SAGD and upgrader facilities is expected to begin in 2005, with the SAGD facilities to be completed in late-2006 and the upgrader in 2007. The upgrader is expected to come on stream in the second half of 2007 with our share of bitumen production ramping up to 36,000 bbls/d (approximately 30,000 bbls/d of synthetic crude oil production).

We are continuing to operate the three well-pair SAGD pilot to optimize performance and gain a better understanding of our operating requirements. To date, we have experienced higher than expected steam-to-oil ratios primarily as a result of the existence of lean zones which absorb the steam without increasing the oil flow. Late in 2004, we shut in one well-pair and reduced the operating pressure of the remaining two well-pairs to see if we could reduce fluid losses into the lean zones. As a result, we have seen fluid losses decline, and our steam to oil ratio is continuing to drop. Production is now averaging 500 to 600 bbls/d per well-pair, in line with industry experience and our expectations given the reduced operating pressures.

As a result of our core hole and horizontal drilling for the commercial SAGD wells, we are confident that the lean zone density in the commercial area is lower than the pilot area. We expect to operate most of our commercial wells at higher pressures than the current operating pressures of the SAGD pilot. Higher operating pressures increase well productivity.

To ensure certainty and reliability of bitumen production when we begin upgrading, we are accelerating one well pad consisting of 13 well pairs. This pad will be drilled and tied-in after the current 65 well pairs, for a gross cost of $98 million. While there is no change to total project costs, accelerating this drilling capital increases the total gross capital to upgrader start-up from $3.4 billion to $3.5 billion. We expect to have sufficient bitumen supply to fill our upgrader to capacity as a result of the accelerated drilling of the well pairs and the lower lean zone density.

To the end of December, approximately 35% of the project's total costs are committed and 20% of these costs have been incurred. Costs to date are consistent with our original estimates and the project is on time and on budget.

NORTH SEA DEVELOPMENT

Following our acquisition in the North Sea, we invested $46 million in Buzzard. In 2005, we plan to invest approximately $530 million for development drilling, pipeline installation and facility construction. This development is on budget and on schedule to begin production in late-2006, with our share of production expected to ramp up to 80,000 boe/d before royalties during 2007.

We also plan to evaluate and start developing a number of smaller discoveries on our North Sea acreage. These discoveries contribute to the expected doubling of non-Buzzard production in the North Sea by 2008. The first of these projects, Farragon, is scheduled to come on stream in late-2005, with our share of production reaching between 3,000 and 4,000 boe/d before royalties by early-2006.

[GRAPHICS OMITTED]
[Margin text: Our Long Lake and Buzzard developments are on schedule and on budget.]

[Margin text: North Sea should be producing about 120,000 boe/d after royalties in 2008.]

32

YEMEN BLOCK 51

At Block 51, we began first oil production ahead of schedule in mid-November. Production from the BAK-A field was producing 16,700 bbls/d before royalties at year-end. Early production from several development wells is handled through temporary production facilities and a new 22-km oil pipeline that connects to the existing Masila export pipeline. We expect to reach full production of 25,000 bbls/d before royalties late in the second quarter of 2005. Another 15 development wells are planned throughout 2005.

We are developing our second Block 51 discovery, BAK-B. The field will initially be developed with five wells and is expected to come on stream in late-2005. We expect the BAK-A and BAK-B fields to maintain production at approximately 25,000 bbls/d before royalties, through 2007. We also expect to have sufficient capacity with our production facilities to handle any additional growth that may come from exploration success on the block.

SYNCRUDE STAGE 3 EXPANSION

We expect the Syncrude expansion to be completed in early-2006, adding 8,000 bbls/d before royalties of synthetic crude net to our 7.23% interest in the joint venture. In 2005, we will focus on completing and commissioning the upgrader expansion and increasing bitumen production supply.

NEW GROWTH EXPLORATION

We remain committed to exploration for longer-term growth. Like other aspects of our business, our exploration portfolio has undergone a transition. Once characterized by non-operated, high-risk prospects, our program is focussing more on prospects that are operated, so we control timing, and have lower risk. We have a balance of short and longer cycle-time prospects. Many are also located near existing infrastructure, allowing for relatively quick tie-in upon success.

[GRAPHIC OMITTED]
[Margin text: We remain committed to exploration for longer-term growth and have both short and longer cycle-time prospects.]

We had a very active exploration program in 2004. We had success on OPL-222 in Nigeria, and in the Gulf of Mexico at Tobago, Dawson Deep and most recently Wrigley and Anduin. We will book proved reserves for these discoveries once commercial projects are sanctioned.

Below are the results of our 2004 exploration program:

WELL                     LOCATION                  INTEREST              WELL RESULTS
-------------------------------------------------------------------------------------------------------------------
NIGERIA
Usan 5                   OPL-222                   20% non-operated      sampled oil in several intervals
Usan 6                   OPL-222                   20% non-operated      flowed at restricted rate of 5,800 bbls/d
                                                                         from one interval
Ameena                   OML-115                   40% operated          well abandoned

EQUATORIAL GUINEA
Zorro                    Block K                   50% operated          well abandoned

YEMEN
BAK-C                    Block 51                  87.5% operated        well abandoned
BAK-E                    Block 51                  87.5% operated        well abandoned
BAK-I                    Block 51                  87.5% operated        encountered oil shows; testing in
                                                                         progress

US GULF OF MEXICO
Shark                    South Timbalier 174       40% non-operated      well abandoned
Dawson Deep              Garden Banks 625          15% non-operated      discovery expected to begin producing in
                                                                         late-2005 through sub-sea tie-back to the
                                                                         Gunnison SPAR
Tobago                   Alaminos Canyon 858/859   13.34% non-operated   discovery temporarily abandoned; possibly
                                                                         part of future regional development
Crested Butte            Green Canyon 242          100% operated         well abandoned as oil shows were close
                                                                         to salt; further work required to see if
                                                                         side-track warranted
Main Pass 240            Main Pass 240             45% non-operated      well abandoned
Fawkes                   Garden Banks 303          33 1/3% non-operated  well abandoned
Wind River               West Cameron 335          50% non-operated      well abandoned
Wrigley                  Mississippi Canyon 506    50% non-operated      gas discovery expected on stream
                                                                         mid-2006
Anduin                   Mississippi Canyon        50% operated          encountered oil shows; side-tracking to
                         754/755                                         delineate
-------------------------------------------------------------------------------------------------------------------

[GRAPHIC OMITTED]
[Margin text: 16 wells drilled: 6 successful, 1 requires testing, 9 abandoned.
See page 44 for dry-hole costs expensed.]

33

Our US program was delayed in 2004 due to rig delays and storms, but we plan to drill up to 10 exploration wells in the Gulf in the next year. This includes major deep-water, sub-salt prospects at Vrede, Knotty Head and Pathfinder. Most of the drilling rigs are lined up, partner approvals are in place and we are looking forward to the results of this program.

Overall, we expect to drill more than 20 high-potential wells in 2005, with most of these to be drilled in the first half of the year. Internationally, we are planning to drill exploration wells offshore West Africa, at least four wells in the North Sea and four wells on Block 51 in Yemen.

[GRAPHIC OMITTED]
[Margin text: In 2005, we plan to drill more than 20 high-potential wells.]

We already have three wells underway with results expected in the first half of 2005:

REGION                   WELL                      LOCATION              INTEREST
-----------------------------------------------------------------------------------------
US Gulf of Mexico        Big Bend                  Mustang Island A-110  50% non-operated
US Gulf of Mexico        Vrede                     Atwater Valley        25% non-operated
                                                   223/224/267/268
Yemen                    BAK-J                     Block 51              87.5% operated

In Canada, we continue to focus on large unconventional resource opportunities. We expect to establish commerciality of our Upper Mannville CBM pilot at Corbett in 2005, setting the stage for full field development, and to continue evaluating other Upper Mannville and Horseshoe Canyon CBM prospects. We also plan to continue a number of enhanced oil recovery pilot projects on our heavy oil properties in west central Saskatchewan. These projects are evaluating technologies to increase recovery of our extensive heavy oil properties.

CORE ASSETS

We are limiting our capital investment in core assets: the Gulf of Mexico shelf, Masila in Yemen, and Western Canada. Generally, only 20% of the cash flow they generate is being reinvested back into these assets. Our goal is to maximize value from these assets in the form of returns, not necessarily increasing reserves or production. By maximizing value, we also generate significant free cash flow from these assets to help fund our major development projects and new growth exploration.

[GRAPHIC OMITTED]
[Margin text: Core asset investment is focussed on maximizing returns, not just increasing production or reserves.]

In the Gulf of Mexico, we tied-in the third development well at Aspen and the remaining development wells at Gunnison. In 2005, our development program will focus on a number of shallow-water gas opportunities in the Eugene Island and Vermilion areas. In the deep-water, we intend to drill and tie back two sub-sea wells and the Dawson Deep discovery to the Gunnison SPAR.

In the North Sea, we plan to drill, complete and tie-in five development wells in the Scott/Telford area, work-over several existing wells and de-bottleneck and upgrade production facilities on the Scott platform in 2005.

In Yemen, the Masila Block continues to generate value. At the end of 2004, we have produced approximately 80% of Masila's expected reserves and have generated more than US$1.5 billion of free cash flow, net to us. As we continue to deplete the remaining reserves, we expect to recover more than US$1 billion of additional free cash flow before the primary term of our production sharing agreement expires in 2011.

The Masila fields are maturing and we are managing the pace of our drilling program to between 20 and 40 wells per year to ensure we recover the remaining reserves in the most economic and prudent manner. In 2005, we plan to drill at least 20 wells to further develop existing fields and test deeper horizons where we have had recent success. We expect our share of Masila production to be between 74,000 and 84,000 bbls/d before royalties and to generate approximately $300 million of free cash flow.

In Canada, we continue focusing on maximizing value from our existing assets through infill drilling, optimizing production from existing wells and reducing operating costs.

34

CHEMICALS

In the fourth quarter, our Brandon chemicals operations completed their sixth expansion using relocated equipment from our idled Louisiana facility. The expansion increased sodium chlorate production by 65,000 tonnes per year, raising the annual plant capacity to over 260,000 tonnes. The Brandon plant is now the largest sodium chlorate plant in the world, and we are one of the largest and lowest cost producers of sodium chlorate in North America. Low input and operating costs here are expected to help lower our overall manufacturing cost of sodium chlorate. Activities in 2005 will focus on maintaining existing infrastructure and limiting plant downtimes.

[GRAPHIC OMITTED]
[Margin comment: The expansion at Brandon makes it the world's largest sodium chlorate plant.]

MARKETING, CORPORATE AND OTHER

In 2004, we continued implementing and realizing full benefits from our SAP and other information technology platforms.

FINANCIAL RESULTS

YEAR TO YEAR CHANGE IN NET INCOME
                                                                                         MDA PAGE
(Cdn$ millions)                                           2004 VS 2003   2003 VS 2002   REFERENCE
-------------------------------------------------------------------------------------------------
NET INCOME FOR 2003 AND 2002 (1)                                578             409
                                                          ===========================
   Favourable (unfavourable) variances:

   CASH ITEMS:
     Production volumes, after royalties:
       Crude oil                                               (116)             51
       Natural gas                                               (8)             41
       Change in crude oil inventory                             40             (25)
                                                          ---------------------------
         Total volume variance                                  (84)             67      page 36
                                                          ---------------------------
     Realized commodity prices:
       Crude oil                                                365              48
       Natural gas                                               --             234
                                                          ---------------------------
         Total price variance                                   365             282      page 39
                                                          ---------------------------
     Oil and gas operating expense:
       Conventional                                             (55)             46
       Synthetic                                                 (2)            (14)
                                                          ---------------------------
         Total operating expense variance                       (57)             32      page 42
                                                          ---------------------------
     Marketing contribution                                     (14)             96      page 46
     Chemicals contribution                                      10              (5)     page 48
     General and administrative                                 (39)            (34)     page 49
     Interest expense                                            26              12      page 50
     Current income taxes                                       (38)             13      page 50
     Other                                                      (22)             21      page 51
                                                          ---------------------------
   TOTAL CASH VARIANCE                                          147             484
                                                          ---------------------------

   NON-CASH ITEMS:
     Depreciation, depletion, amortization and impairment:
       Oil & Gas and Syncrude                                   271            (312)     page 43
       Other                                                     13              (5)
     Exploration expense                                        (45)            (12)     page 44
     General and administrative                                 (70)             (4)     page 49
     Future income taxes                                       (176)             34      page 50
     Other                                                       75             (16)     page 51
                                                          ---------------------------
   TOTAL NON-CASH VARIANCE                                       68            (315)
                                                          ---------------------------

                                                          ---------------------------
NET INCOME FOR 2004 AND 2003                                    793             578
                                                          ===========================

Note:
(1) Includes results of discontinued operations (see Note 11 to our Consolidated Financial Statements).

Significant variances in net income are explained in the sections that follow. The impact of foreign exchange on our operations is summarized on page 51.

35

OIL & GAS AND SYNCRUDE

PRODUCTION

All volumes discussed below are our working interest volumes.

                                           2004                          2003                            2002
-----------------------------------------------------------------------------------------------------------------------------
                                    Before            After         Before             After         Before            After
                                 Royalties (1)    Royalties      Royalties (1)     Royalties      Royalties (1)    Royalties
                               ----------------------------------------------------------------------------------------------
Oil and Liquids (mbbls/d)
   Yemen                             107.3             53.5          116.8              57.5          118.0             55.8
   Canada (2)                         36.2             28.2           46.3              35.4           56.3             43.4
   United States                      30.0             26.5           28.3              25.0            9.9              8.2
   Australia (3)                       2.7              2.5            6.1               5.6           12.8             10.3
   United Kingdom                      1.5              1.5             --                --             --               --
   Other Countries                     5.3              4.7            5.4               4.6            8.9              5.2
Syncrude (mmbls/d) (4)                17.2             16.6           15.3              15.2           16.6             16.5
                               ----------------------------------------------------------------------------------------------
                                     200.2            133.5          218.2             143.3          222.5            139.4
                               ----------------------------------------------------------------------------------------------
Natural Gas (mmcf/d)
   Canada (2)                          146              115            158               125            167              128
   United States                       148              126            145               122            112               93
   United Kingdom                        3                3             --                --             --               --
                               ----------------------------------------------------------------------------------------------
                                       297              244            303               247            279              221
                               ----------------------------------------------------------------------------------------------

Total (mboe/d)                         250              174            269               185            269              176
                               ==============================================================================================

Notes:
(1) We have presented production volumes before royalties as we measure our performance on this basis consistent with other Canadian oil and gas companies.

(2) Includes the following production from discontinued operations. See Note 11 to our Consolidated Financial Statements.

(mboe/d)                           2004       2003       2002
-------------------------------------------------------------
Production
  Before Royalties                   --        6.2       10.5
  After Royalties                    --        4.6        7.8
                                   --------------------------

(3) Comprises production from discontinued operations. See Note 11 to our Consolidated Financial Statements.

(4) Considered a mining operation for US reporting purposes.

2004 VS 2003 - LOWER PRODUCTION DECREASED NET INCOME BY $84 MILLION

Production after royalties decreased 6% from 2003. Our 2003 production included volumes from our non-core Canadian light oil properties in southeast Saskatchewan that were sold in August 2003. Excluding these volumes, our production after royalties decreased 3%. This table summarizes the change:

                                                                                                      Before          After
(mboe/d)                                                                                           Royalties      Royalties
-----------------------------------------------------------------------------------------------------------------------------
2003 Production                                                                                          269            185
    Sale of non-core Canadian properties                                                                  (6)            (5)
                                                                                              -------------------------------
                                                                                                         263            180
    Production changes:
      Masila Block in Yemen                                                                              (11)            (5)
      Block 51 in Yemen                                                                                    1              1
      Canada                                                                                              (6)            (4)
      Gulf of Mexico - deep-water                                                                          8              7
      Gulf of Mexico - shallow-water                                                                      (6)            (5)
      Australia                                                                                           (3)            (3)
      North Sea                                                                                            2              2
      Syncrude                                                                                             2              1
                                                                                              --------------- ---------------
2004 Production                                                                                          250            174
                                                                                              =============== ===============

[GRAPHICs OMITTED]
[Margin text: Production dropped 6% after royalties and 7% before royalties as new volumes did not offset declines in maturing fields.]

[Margin graphic: Bar graph: Oil and Gas Production before royalties (mmboe/d)]

36

Production before royalties decreased 7% as new volumes from the deep-water Gulf of Mexico, the North Sea and Block 51 did not offset declines in our maturing conventional assets and late-life assets offshore Nigeria and Australia and the sale of Canadian properties in 2003. Our known future production increases are expected to come from Block 51 in Yemen in 2005, Syncrude in early-2006, first production from Buzzard in the North Sea in late-2006, and from bitumen production in 2006 and synthetic crude in 2007 from the Long Lake Project.

YEMEN
Production decreased 8% compared to 2003. The shortfall resulted from declining base production, lower drilling success rates and delays in approvals for our development drilling program. As a result, we drilled 73 development wells rather than the 90 planned, and this drilling was unable to keep up with base declines. In 2005, we plan to drill at least 20 wells.

First production from Block 51 commenced in November 2004 with initial rates around 4,000 bbls/d. By mid-2005, we expect production to ramp up to approximately 25,000 bbls/d before royalties as permanent production facilities, including water handling facilities, are commissioned.

[GRAPHIC OMITTED]
[Margin text: First oil from Block 51 was achieved ahead of schedule.]

We expect production from Masila and Block 51 to average between 90,000 and 100,000 bbls/d before royalties in 2005.

CANADA

Production was down 9% from 2003, after adjusting for the August 2003 sale of non-core, light-oil properties in southeast Saskatchewan. To maximize value, we continue to manage our maturing conventional assets in Western Canada through selective development, cost control and asset dispositions. In 2005, we expect them to produce between 52,000 and 56,000 boe/d before royalties, net to us. Looking ahead, we expect increases as the Long Lake Project starts up with bitumen production in 2006 and synthetic crude in 2007. We are considering the sale of certain Canadian oil and gas properties in 2005. Any sale of assets would reduce our 2005 production volumes.

GULF OF MEXICO

Production averaged an all-time high of 54,700 boe/d before royalties, 4% higher than last year, due to new deep-water volumes at Aspen and Gunnison.

Our deep-water production grew 8,000 boe/d before royalties over 2003 levels. These high-margin volumes contribute cash netbacks almost twice our corporate average. The third Aspen development well, brought on stream in July, is currently producing 16,200 boe/d before royalties. However, we experienced higher water cuts on our Aspen-1 well and completed an intervention, attempting to reduce these cuts. The well was shut-in for most of August to complete this work. To date, the response has not met our expectations as there has been no increase in oil production or decrease in water production. We are currently producing 24,500 boe/d before royalties from all three wells.

[GRAPHIC OMITTED]
[Margin text: We added 8,000 boe/d before royalties of high-margin barrels in the deep water. These fuelled our corporate netbacks. See page 45.]

We completed the tie-in of the remaining wells at Gunnison which added 9,000 boe/d before royalties in 2004. These volumes were less than expected as one well sanded up in early May and another encountered tar on completion. We successfully re-completed the well that sanded up and brought it back on stream in mid-August. A sidetrack on the tar well was completed and this well started producing from one of three intervals in mid-December. We expect to produce from all three intervals by the end of February 2005.

Our shallow-water production declined 6,000 boe/d before royalties compared to 2003, caused by base declines and delays in our development program. We had planned an expanded development program in the second half of the year, but it was delayed due to rig delivery, storms and drilling problems. Development drilling at Vermilion 302/320, West Cameron 170 and Vermilion 76 helped mitigate declines.

We expect production from the Gulf of Mexico to average between 50,000 and 60,000 boe/d in 2005.

37

NORTH SEA

The acquired Scott and Telford fields contributed production for December 2004, adding 2,000 boe/d before royalties to our annual average. In 2005, we expect these fields to produce between 14,000 and 18,000 boe/d before royalties, net to us.

OTHER COUNTRIES

Australia produced its final barrel in November and abandonment activities are proceeding. We expect abandonment activities to be completed in 2005. Production from Colombia grew 50% from 2003 to 4,800 bbls/d before royalties as we continue to implement our development program at Guando. We continue to produce small volumes from the Ejulebe field offshore Nigeria, but we expect final production in the first half of 2005.

[GRAPHIC OMITTED]
[Margin text: Australia is fully depleted and Nigeria is to be depleted in 2005.]

SYNCRUDE

Syncrude achieved a new annual production record despite operating problems towards the end of the year. In November, we experienced an unscheduled coker shut-down. After the coker had returned to full capacity in early December, a major electrical interruption led to the shut-down of the LC finer for the rest of the year. The LC finer has returned to full capacity. Turnarounds on the coker and hydrotreater units in early-2005 are expected to cause first quarter production to be lower than planned by 25%. We expect 2005 Syncrude volumes of between 16,000 and 18,000 bbls/d before royalties, net to us.

[GRAPHIC OMITTED]
[Margin text: Syncrude produced a record 17.2 mboe/d before royalties, net to us.]

2003 VS 2002 - 5% PRODUCTION GROWTH AFTER ROYALTIES ADDED $67 MILLION TO NET INCOME

Production after royalties grew 5%, with new low-royalty, deep-water production from Aspen and Gunnison, and more cost recovery barrels from Masila in Yemen. At Masila, we received a greater percentage of gross production to recover costs incurred.

Production before royalties was flat compared to 2002 as growth in our US deep-water production was partially offset by dispositions in Canada, production declines offshore Nigeria and Australia, and maturing conventional assets. Production from the Masila block in Yemen decreased slightly in 2003 consistent with the overall decline in the field's base production. In Canada, we aggressively managed our assets by developing them where we could add value or by selling them at attractive prices where this maximized value. A full year of deep-water Aspen production increased US production rates 84% to record levels in 2003. Production adds and optimization activities at Eugene Island 295 and Vermilion 76 offset declines on the Shelf.

Our production at Buffalo, offshore Australia and at Ejulebe, offshore Nigeria declined as expected throughout 2003 as both fields approached the end of their economic life. Syncrude production decreased 8% in 2003 as an unplanned additional coker turnaround was completed during the year.

38

COMMODITY PRICES

                                                        2004      2003      2002
--------------------------------------------------------------------------------
CRUDE OIL
   West Texas Intermediate (US$/bbl)                   41.40     31.04     26.09
                                                      --------------------------

   Differentials (1) (US$/bbl)
     Masila                                             4.84      3.03      1.41
     Heavy Oil                                         13.53      8.63      6.49
     MARS                                               6.15      3.53      2.51

   Producing Assets (Cdn$/bbl)
     Yemen                                             47.59     39.45     38.80
     Canada                                            36.60     32.37     31.13
     United States                                     46.60     37.68     38.88
     Syncrude                                          52.80     43.36     40.89
     Australia                                         51.22     43.14     40.30
     North Sea                                         46.81        --        --
     Other Countries                                   43.07     38.22     38.96

   Corporate Average (Cdn$/bbl)                        45.90     38.04     37.13
                                                      --------------------------

NATURAL GAS
   New York Mercantile Exchange (US$/mmbtu)             6.19      5.60      3.37
   AECO (Cdn$/mcf)                                      6.44      6.35      3.84
                                                      --------------------------

   Producing Assets (Cdn$/mcf)
     Canada                                             5.76      5.64      3.57
     United States                                      7.89      8.16      5.29
     North Sea                                          8.28        --        --

   Corporate Average (Cdn$/mcf)                         6.85      6.85      4.25
                                                      --------------------------

NEXEN'S AVERAGE REALIZED OIL AND GAS PRICE (Cdn$/boe)  44.94     38.63     35.14
                                                      --------------------------

AVERAGE FOREIGN EXCHANGE RATE
   Canadian to US Dollar                              0.7683    0.7135    0.6369
                                                      --------------------------

Note:
(1)  These differentials are a discount to WTI.

[GRAPHIC OMITTED]
[Margin graphic: Chart of Nexen's average realized oil and gas price 2002-2004]

2004 VS 2003 - HIGHER REALIZED PRICES ADDED $365 MILLION TO NET INCOME

Crude oil prices reached record levels in 2004, supported by supply concerns, high demand and speculative traders increasing volatility to all-time highs. The positive impact of strong crude oil reference prices was offset in part by the weakening US dollar and widening crude oil quality differentials.

All of our oil sales and most of our gas sales are denominated in or referenced to US dollars. As a result, a stronger Canadian dollar relative to the US dollar reduced our realized crude oil price by $3.50/bbl and our realized natural gas price by $0.50/mcf. In total, our net sales decreased $220 million from 2003 due to the weakening US dollar. The Canadian to US dollar exchange rate closed the year at 83(cent).

[GRAPHIC OMITTED]
[Margin text: A stronger Canadian dollar reduced our realized oil and gas prices and dropped net sales by $220 million.]

39

CRUDE OIL REFERENCE PRICES

Crude oil prices reached record highs in 2004 and West Texas Intermediate (WTI) averaged US$41.40/bbl in 2004, 33% higher than its 2003 average of US$31.04/bbl. At its peak, WTI broke through US$55/bbl. Strong demand and concerns around supply disruptions and inventories, coupled with significant volatility, contributed to the increase.

[GRAPHIC OMITTED]

[LINE CHART - 2004 Oil Prices (WTI Monthly Average]

Strong global demand, led by China and India, prevailed throughout much of 2004. Even as WTI reached successive record highs late in the year, demand for crude oil, particularly sweet blends, remained strong globally. While global demand drove crude oil prices up, actual and potential supply concerns supported major price moves:

o terrorist activities in Iraq continued throughout the year, disrupting supply on several occasions;

o attacks in Saudi Arabia called into question not only the security of current supply, but also the security of the only significant spare capacity globally;

o on-going civil unrest in Nigeria and Venezuela impacted their ability to export crude;

o labour disputes and safety concerns in the North Sea disrupted supply on several occasions, increasing concerns around already tight European supply;

o Hurricane Ivan disrupted supply from the Gulf of Mexico in the third quarter and increased concern over low inventory levels in the US; and

o the Yukos bankruptcy crisis reduced expected production increases from Russia.

OPEC responded by increasing output on several occasions, but these increases were not enough to change the perception that there was insufficient stable supply to meet demand.

These events caused significant oil price volatility. As a result, traders and longer-term commodity investors flocked to the market, pushing daily trading bands higher than previously observed. Traders' positions and related profit-taking created more volatility. With supply concerns, growing speculation and continued volatility, we expect to see high crude oil prices continue into 2005.

[GRAPHICS OMITTED]
[Margin text: WTI oil price was 33% higher than in 2003, reflecting supply concerns.]
[Margin text: We expect strong crude oil prices in 2005.]

CRUDE OIL DIFFERENTIALS

Crude oil differentials were wide in 2004 due mostly to strong benchmark prices. Growing global demand for diesel and gasoline has created a premium for light, sweet crudes. Incremental heavy, sour barrels brought on by OPEC throughout the year widened out the light/heavy differentials even further. The Canadian heavy oil differential widened to average US$13.53/bbl, as light, sweet blends increased in value relative to heavy, sour blends. Although differentials were wide, the normal seasonal patterns held true which narrows the heavy oil differential through the summer when there is increased demand due to road construction. Heavy oil differentials reached a record-wide US$22.67/bbl in December from these factors.

[GRAPHIC OMITTED]
[Margin text: Widening differentials reduced the price we received for our heavy oil, Masila and Aspen volumes.]

40

The WTI/Brent differential (relevant for our Masila crude and North Sea production) widened to average US$3.19/bbl in 2004 compared to US$2.20 in 2003. Higher freight rates due to increased production out of the Middle East made Brent more expensive to purchase, thereby decreasing its value relative to WTI.

The Masila differential tracked the Brent/WTI spread very closely through the first eight months of the year, but widened relative to both WTI and Brent late in the year. As with Canadian heavy oil differentials, our Masila barrels were impacted by the increased supply of heavy, sour oil from the Middle East later in the year and strong demand by Asian refiners for lighter blends. The differential reached US$7.84/bbl in the fourth quarter, compared to its annual average of US$4.84.

Similar to Canadian heavy oil and Masila, the MARS differential (relevant for Aspen) widened on the strength of WTI and the increased supply of world heavies.

NATURAL GAS REFERENCE PRICES

Natural gas prices remained strong in 2004, buoyed by high crude oil prices and tight long-term supply and demand fundamentals. In 2004, NYMEX averaged US$6.19/mcf, 11% higher than 2003. Weather was reasonably mild in North America, causing a strong build in inventory levels into winter.

[GRAPHIC OMITTED]

[LINE CHART - 2004 Natural Gas Prices (NYMEX Monthly Average)]

At year-end, inventory levels were 3% higher than 2003 and 11% higher than the five-year average. Despite this, long-term concerns remain around the ability of supply to keep up with demand from North American utilities. As a result, we expect prices to remain above US$5/mmbtu into the future. Even with short-term bearish fundamentals, prices tracked their normal seasonal pattern and remained relatively strong into winter, consistent with higher heating oil prices.

[GRAPHICS OMITTED]
[Margin text: NYMEX gas price was 11% higher than in 2003, reflecting concerns that supply could not keep pace with demand.]

[Margin text: We expect prices to remain above US$5/mcf into the future]

2003 VS 2002 - HIGHER REALIZED PRICES ADDED $282 MILLION TO NET INCOME

Both crude oil and natural gas commodity prices reached near record levels in 2003 as supply and demand fundamentals supported strong prices. The positive impact of strong crude oil and natural gas reference prices was offset in part by the stronger Canadian dollar and wider crude oil differentials.

Since all of our oil sales and most of our gas sales are denominated in or referenced to US dollars, the strengthening Canadian dollar relative to the US dollar reduced our realized crude oil price by $4.50/bbl and our realized natural gas price by $0.80/mcf. In total, our net sales decreased $280 million from 2002 levels because of the stronger Canadian dollar. The Canadian to US dollar exchange rate closed the year at 77(cent).

41

OPERATING COSTS

(Cdn$/boe)                                   2004                        2003                            2002
-----------------------------------------------------------------------------------------------------------------------------
                                       Before         After          Before            After          Before           After
                                    Royalties (1) Royalties       Royalties (1)    Royalties       Royalties (1)   Royalties
                                 --------------------------------------------------------------------------------------------
Conventional Oil and Gas
   Yemen                                 2.80          5.64            2.16             4.37            1.95            4.13
   Canada                                7.12          8.98            6.00             7.76            5.70            7.45
   United States                         5.30          6.12            4.49             5.19            9.09           10.87
   Australia                            32.94         35.73           18.60            20.21            9.76           12.14
   United Kingdom                        8.26          8.26              --               --              --              --
   Other Countries                       3.76          4.09            7.47             9.01            6.21           10.69
   Average Conventional                  5.13          7.59            4.17             6.24            4.60            7.24
                                 --------------------------------------------------------------------------------------------

Synthetic Crude Oil
   Syncrude                             19.89         20.61           21.96            22.18           18.10           18.21
Average Oil and Gas                      6.15          8.83            5.19             7.56            5.42            8.26
                                 --------------------------------------------------------------------------------------------

Note:
(1) Operating costs per boe are our total oil and gas operating costs divided by our working interest production before royalties. We use production before royalties to monitor our performance consistent with other Canadian oil and gas companies.

2004 VS 2003 - HIGHER OIL AND GAS OPERATING COSTS DECREASED NET INCOME BY $57 MILLION

Our operating costs have increased as a result of high-cost, late-life barrels in Australia, higher maintenance costs in Yemen and Canada, more workover and remediation activity in the Gulf of Mexico and the spread of fixed costs over fewer barrels.

[GRAPHIC OMITTED]
[Margin text: Higher operating costs per boe reflect lower volumes and increased maintenance and workovers.]

Flow line replacements, higher water handling costs and increased maintenance at Masila in Yemen increased our corporate unit operating costs by 30(cent)/boe. However, these increased Yemen costs only reduce our corporate netbacks by
5(cent)/boe as a result of the cost recovery mechanism contained in our production sharing agreement.

Operating costs in Canada were slightly lower than 2003, but because of declining volumes, our corporate average unit costs increased by 25(cent)/boe. We expect our unit costs to continue to increase with increased water handling, higher labour costs and declining volumes.

Aspen-1 intervention costs of $12 million were expensed during the year. They were higher than expected as storm activity in the Gulf extended the work. These costs, together with higher workover activities on the Shelf, contributed a
28(cent)/boe increase to our corporate unit costs.

Australia produced its final barrel in November. These expensive late-life barrels increased our corporate unit costs by 30(cent)/boe but high crude prices allowed us to produce them economically.

The incremental North Sea barrels added 7(cent)/boe to our corporate average for the year.

The strength of the Canadian dollar reduced our US-dollar denominated operating costs, contributing a 25(cent)/boe reduction to our corporate unit costs.

Syncrude's operating costs were flat compared to 2003, but because of increased volumes, unit costs decreased 9%. Higher natural gas input costs were offset by lower maintenance costs in 2004 since there was not a major coker turnaround. As more expensive Syncrude barrels were a larger portion of our total corporate production in the year, our corporate unit operating costs increased by
17(cent)/boe.

[GRAPHIC OMITTED]
[Margin graphic: Nexen's operating Costs before Royalties ($/boe) 2002 - 2004]

2003 VS 2002 - LOWER OIL AND GAS OPERATING COSTS INCREASED NET INCOME BY $32 MILLION

Conventional unit operating costs decreased as we added low-cost Aspen production in the Gulf of Mexico and the Canadian dollar strengthened relative to the US dollar. Increased workover and maintenance activity in Yemen and higher water handling costs in Canada partially offset this decrease.

Low-cost Aspen production reduced US operating costs by 50% and lowered our corporate average unit operating costs by approximately 40(cent)/boe. Aspen production costs are lower than our corporate average for conventional production as most of the costs in the deep-water are capital related.

42

The strengthening Canadian dollar decreased US-dollar denominated operating costs, lowering our corporate average unit operating costs by approximately
25(cent)/boe. Higher repairs, increased maintenance and workover activity resulted in a 55(cent)/bbl increase in Yemen operating costs. However, these increased Yemen costs only reduced our corporate netbacks by 14(cent)/boe as a result of the cost recovery mechanism contained in our production sharing agreement. As well, unit operating costs offshore Australia and Nigeria increased as fixed costs were spread over declining production volumes.

Syncrude operating costs increased 21% due to higher natural gas input costs and increased turnaround and maintenance activity in 2003. Lower volumes also increased unit operating costs as more than 95% of the operating costs are fixed.

DEPRECIATION, DEPLETION, AMORTIZATION AND IMPAIRMENT (DD&A)

(Cdn$/boe)                                     2004                           2003                            2002
-----------------------------------------------------------------------------------------------------------------------------
                                       Before         After          Before            After          Before           After
                                    Royalties (2) Royalties       Royalties (2)    Royalties       Royalties (2)   Royalties
                                 --------------------------------------------------------------------------------------------
Conventional Oil and Gas
   Yemen                                 4.35          8.77            3.96             8.03            3.47            7.34
   Canada (1)                            9.02         11.37            9.10            11.76            8.22           10.72
   United States                        12.93         14.93           10.80            12.47           12.74           15.38
   Australia                             5.82          6.31           13.31            14.46           10.45           12.99
   United Kingdom                       22.44         22.44              --               --              --              --
   Other Countries                       9.90         10.77           17.09            22.47           13.22           22.90
   Average Conventional                  7.87         11.64            7.37            11.04            6.84           10.81
                                 --------------------------------------------------------------------------------------------

Synthetic Crude Oil
   Syncrude                              2.75          2.85            2.50             2.53            2.13            2.17
Average Oil and Gas                      7.52         10.80            7.09            10.33            6.55           10.01
                                 --------------------------------------------------------------------------------------------

Notes:
(1) 2003 DD&A per boe excludes the impairment charge described in Note 5 to the Consolidated Financial Statements.

(2) DD&A per boe is our DD&A for oil and gas operations divided by our working interest production before royalties. We use production before royalties to monitor our performance consistent with other Canadian oil and gas companies.

2004 VS 2003 - LOWER OIL AND GAS DD&A INCREASED NET INCOME BY $271 MILLION

Our DD&A expense in 2003 included an impairment charge of $269 million largely attributable to Canadian heavy oil property negative reserve revisions. Excluding this charge from our 2003 per unit DD&A costs, our per unit corporate depletion rate has increased. Higher depletion from our more capital-intensive deep- water properties in the Gulf of Mexico has increased corporate rates by
70(cent)/boe. These properties, however, benefit from low royalties and lower unit operating costs as most of the costs are capital in nature.

Yemen increased our corporate rate by 30(cent)/boe mainly due to the additional volumes from Block 51, offset slightly by lower volumes at Masila. The North Sea volumes increased our corporate rate by 20(cent)/boe. Our UK depletion rate of $22.44/boe reflects the depletion of the portion of the acquisition cost allocated to our interests in the Scott/Telford fields on a before-tax basis.

Syncrude depletion rates increased reflecting the depletable costs of the Aurora 2 bitumen train which came into service in late-2003.

By way of offset, we benefited from the strong Canadian dollar as the depletion of our US and International assets is denominated in US dollars. This lowered our depletion rate by 45(cent)/boe. As well, the depletable costs on our Canadian heavy oil properties were reduced at year-end 2003 and both Australia and Nigeria are nearly fully depleted. The write down of our Canadian heavy oil properties reduced our depletion rate by 31(cent)/boe and lower volumes in Canada, Australia and Nigeria contributed a combined reduction of 65(cent)/boe.

[GRAPHIC OMITTED]
[Margin text: Our DD&A rate is increasing because of more capital-intensive areas includiong the Gulf of Mexico and the North Sea.]

2003 VS 2002 - HIGHER OIL AND GAS DD&A REDUCED NET INCOME BY $312 MILLION

Conventional depletion rates increased with higher 2002 finding and development costs and our changing production mix, as more capital-intensive properties like Aspen contributed production volumes. These properties, however, deliver higher-margin returns making them a valuable part of our portfolio. We also experienced higher depletion rates offshore Nigeria and Australia, as we prepared to abandon these fields.

43

The strengthening Canadian dollar offset these increases as our depletion from International and the US is denominated in US dollars. This lowered our corporate average rate by approximately 48(cent)/boe.

Our 2003 DD&A expense includes an impairment charge of $269 million largely attributable to reserve revisions to Canadian heavy oil properties. These revisions reflected our more conservative view of production profiles for certain properties, proven undeveloped reserves we were no longer certain we could recover and changes in end-of-life economic assumptions.

EXPLORATION EXPENSE (1)

(Cdn$ millions)                                             2004    2003    2002
--------------------------------------------------------------------------------
Seismic                                                       73      62      80
Unsuccessful Drilling                                        125      70      61
Other                                                         48      69      48
                                                            --------------------
Total Exploration Expense                                    246     201     189
                                                            ====================

New Growth Exploration                                       266     267     179
Geological and Geophysical Costs                              73      62      80
                                                            --------------------
Total Exploration Expenditures                               339     329     259
                                                            ====================

Exploration Expense as a % of Exploration Expenditures       73%     61%     73%
                                                            --------------------

Note:
(1) Includes exploration expense from discontinued operations. See Note 11 to our Consolidated Financial Statements.

2004 VS 2003 - HIGHER EXPLORATION EXPENSE REDUCED NET INCOME BY $45 MILLION

Increased exploration expense reflected the increase in our 2004 exploration capital expenditures. We had further success at Usan on OPL-222, offshore Nigeria, Block 51 in Yemen and at Dawson Deep, Tobago, Wrigley and Anduin in the deep-water Gulf of Mexico. However, unsuccessful drilling included dry holes in the Gulf of Mexico, offshore Nigeria and Equatorial Guinea, and in Yemen.

[GRAPHIC OMITTED]
[Margin text: Increased 2004 exploration expense reflects higher exploration capital. See 2004 drilling results on page 33.]

In the Gulf of Mexico, we had five dry holes: Crested Butte, Main Pass 240, Shark, Fawkes and Wind River. At our 100%-owned Crested Butte well on Green Canyon Block 242, we found oil-bearing sands in many horizons, but the volumes were not commercial so we abandoned the well. Further work is required to determine if a sidetrack is warranted. We expensed $39 million of well costs in the fourth quarter. In 2004, we drilled Main Pass 240 and found the objective sand wet. This well was abandoned in December 2004. Shark was an ultra-deep-shelf gas test on South Timbalier 174 that finished drilling during the first quarter of 2004. Following our evaluation, we expensed $25 million of well costs. While the well has been abandoned, we can re-enter it if required. Fawkes and Wind River, located in deep water, completed drilling and were abandoned in January 2005, resulting in a write-off of $13 million in 2004. Overall, dry hole and seismic costs in the Gulf of Mexico accounted for over 50% of our exploration expense.

[GRAPHIC OMITTED]
[Margin text: Gulf of Mexico accounts for half our 2004 dry-hole and seismic costs.]

Dry hole costs also included the Ameena prospect on OML-115, offshore Nigeria, the Zorro-1 prospect, offshore Equatorial Guinea and two unsuccessful exploration wells on Block 51 in Yemen.

2003 VS 2002 - HIGHER EXPLORATION EXPENSE REDUCED NET INCOME $12 MILLION

Exploration expense was higher in light of our increased 2003 exploration capital expenditures. We had success in the Gulf of Mexico, OPL-222, offshore Nigeria and Block 51 in Yemen.

Dry hole and seismic costs in the Gulf of Mexico accounted for over 40% of our exploration expense. Exploration in the Gulf yielded some promising results at Shiloh where we found hydrocarbons but not commercial quantities, so the well costs were written off. We were unsuccessful at Santa Rosa.

Dry hole costs also included three wells in the Alberta foothills of Canada, the Andino-1 well in Colombia, the Escargot well offshore Brazil and the HEK well in Yemen on Block 51.

44

OIL & GAS AND SYNCRUDE NETBACKS

Netbacks are the cash margins we receive for every equivalent barrel sold. Below are the sales prices, per unit costs and netbacks for our producing assets, calculated using our working interest production before and after royalties.

BEFORE ROYALTIES

($/boe) 2004
---------------------------------------------------------------------------------------------------------------------
                         Yemen    Canada          US   Australia         UK         Other     Syncrude         Total
                       ----------------------------------------------------------------------------------------------
Sales                    47.59     35.76       46.94       51.22      47.45         43.07        52.80         44.94
Royalties and other     (23.98)    (7.40)      (6.29)      (4.00)        --         (3.49)       (1.84)       (13.65)
Operating expenses       (2.80)    (7.12)      (5.30)     (32.94)     (8.26)        (3.76)      (19.89)        (6.15)
In-country taxes         (5.82)       --          --          --         --            --           --         (2.48)
                       ----------------------------------------------------------------------------------------------

Cash netback             14.99     21.24       35.35       14.28      39.19         35.82        31.07         22.66
                       ==============================================================================================

($/boe) 2003
---------------------------------------------------------------------------------------------------------------------
                         Yemen    Canada          US   Australia         UK         Other     Syncrude         Total
                       ----------------------------------------------------------------------------------------------
Sales                    39.45     32.99       42.88       43.14         --         38.22        43.36         38.63
Royalties and other     (19.98)    (7.53)      (5.91)      (3.44)        --         (5.69)       (0.48)       (12.14)
Operating expenses       (2.16)    (6.00)      (4.49)     (18.60)        --         (7.47)      (21.96)        (5.19)
In-country taxes         (4.73)       --          --          --         --            --           --         (2.06)
                       ----------------------------------------------------------------------------------------------

Cash netback             12.58     19.46       32.48       21.10         --         25.06        20.92         19.24
                       ==============================================================================================

($/boe) 2002
---------------------------------------------------------------------------------------------------------------------
                         Yemen    Canada          US   Australia         UK         Other     Syncrude         Total
                       ----------------------------------------------------------------------------------------------
Sales                    38.80     27.90       34.21       40.30         --         38.96        40.89         35.14
Royalties and other     (20.45)    (6.53)      (5.82)      (7.88)        --        (16.48)       (0.36)       (12.56)
Operating expenses       (1.95)    (5.70)      (9.09)      (9.76)        --         (6.21)      (18.10)        (5.42)
In-country taxes         (4.81)       --          --          --         --            --           --         (2.10)
                       ----------------------------------------------------------------------------------------------

Cash netback             11.59     15.67       19.30       22.66         --         16.27        22.43         15.06
                       ==============================================================================================

AFTER ROYALTIES

($/boe) 2004
---------------------------------------------------------------------------------------------------------------------
                         Yemen    Canada          US   Australia         UK         Other     Syncrude         Total
                       ----------------------------------------------------------------------------------------------
Sales                    47.59     35.76       46.94       51.22      47.45         43.07        52.80         44.94
Operating expenses       (5.64)    (8.98)      (6.12)     (35.73)     (8.26)        (4.09)      (20.61)        (8.83)
In-country taxes        (11.72)       --          --          --         --            --           --         (3.57)
                       ----------------------------------------------------------------------------------------------

Cash netback             30.23     26.78       40.82       15.49      39.19         38.98        32.19         32.54
                       ==============================================================================================

($/boe) 2003
---------------------------------------------------------------------------------------------------------------------
                         Yemen    Canada          US   Australia         UK         Other     Syncrude         Total
                       ----------------------------------------------------------------------------------------------
Sales                    39.45     32.99       42.88       43.14         --         38.22        43.36         38.63
Operating expenses       (4.37)    (7.76)      (5.19)     (20.21)        --         (9.01)      (22.18)        (7.56)
In-country taxes         (9.58)       --          --          --         --            --           --         (3.00)
                       ----------------------------------------------------------------------------------------------

Cash netback             25.50     25.23       37.69       22.93         --         29.21        21.18         28.07
                       ==============================================================================================

($/boe) 2002
---------------------------------------------------------------------------------------------------------------------
                         Yemen    Canada          US   Australia          UK         Other     Syncrude         Total
                       ----------------------------------------------------------------------------------------------
Sales                    38.80     27.90       34.21       40.30         --         38.96        40.89         35.14
Operating expenses       (4.13)    (7.45)     (10.87)     (12.14)        --        (10.69)      (18.21)        (8.26)
In-country taxes        (10.17)       --          --          --         --            --           --         (3.20)
                       ----------------------------------------------------------------------------------------------

Cash netback             24.50     20.45       23.34       28.16         --         28.27        22.68         23.68
                       ==============================================================================================

[GRAPHIC OMITTED]
[Margin text: With little or no royalties, new production from the deep-water Gulf of Mexico and North Sea is driving our corporate netbacks.]

45

OIL AND GAS MARKETING

(Cdn$ millions)                                                  2004       2003    2002
-----------------------------------------------------------------------------------------
   Revenue                                                        623        568     496
   Transportation                                                (466)      (398)   (423)
   Other                                                           (2)        (1)     --
                                                                -------------------------
Net Revenue                                                       155        169      73
                                                                =========================

Marketing Contribution to Income from Continuing Operations
    before Income Taxes                                            87        111      35
                                                                -------------------------

Natural Gas
   Physical Sales Volumes (bcf/d) (1)                             4.9        3.3     2.9
   Transportation Capacity (bcf/d)                                3.5        2.0     1.2
   Storage Capacity (bcf)                                          27         18       9

Crude Oil
   Physical Sales Volumes (mbbls/d) (1)                           465        479     412
   Storage Capacity (mbbls)                                       408         --      --

Value-at-Risk
   Year-end                                                        21         21      19
   High                                                            42         31      28
   Low                                                             17         14      12
   Average                                                         29         20      17
                                                                -------------------------

Note:
(1) Excludes intra-segment transactions.

[GRAPHIC OMITTED]
[Margin graphic: Oil and Gas Volumes Marketed (boe/d)]

2004 VS 2003 - NET MARKETING REVENUE DECREASED NET INCOME BY $14 MILLION

Although more profitable in 2003, marketing had another exceptional year in 2004, with net revenue of $155 million. Gas marketing contributed $95 million to net revenue from asset-based trading, our energy services business, and from transportation and commodity contracts acquired on favourable terms.

[GRAPHIC OMITTED]
[Margin text: Gas marketing contributed 61% of marketing revenue.]

During the year, we took advantage of market inefficiencies and seasonal variations. In particular, our transportation and storage capacity gave us the flexibility to capitalize on weather events by allowing us to move gas to where it was needed most. We also held financial contracts that allowed us to capture trading profits around time and location spreads.

North American crude oil contributed $25 million to net revenue as varying degrees of backwardation (declining prices) in the forward price curve throughout the year allowed us to capitalize on calendar spreads. In addition, we took advantage of quality spreads and arbitrage opportunities to capture favourable price differences.

International crude oil contributed $24 million, three times higher than last year. Throughout the year, we successfully capitalized on the pricing of purchases relative to sales as we took advantage of backwardation in the forward price curve.

2003 VS 2002 - RECORD NET MARKETING REVENUE INCREASED NET INCOME BY $96 MILLION

Marketing delivered record financial results growing their cash flow by 132% over 2002. This achievement was driven primarily by exceptional results from our gas marketing and trading group, supplemented by steady profits from our crude oil trading and marketing group.

Our natural gas group successfully positioned themselves to benefit from price differences between Western Canada and Eastern North America, and between summer and winter months. We also added transportation and storage capacity to our contract base. Added transportation capacity allowed us to take advantage of price differences between receipt and delivery points while added storage allowed us to take advantage of varying seasonal demand in the summer and winter months.

The continued exit of competitors from the market in 2003 enabled us to acquire contracts on favourable terms, including storage and transportation contracts and natural gas contracts.

46

COMPOSITION OF NET MARKETING REVENUE

(Cdn$ millions)                                                 2004        2003
--------------------------------------------------------------------------------
Trading Activities                                               133         148
Non-Trading Activities                                            22          21
                                                               -----------------
Total Net Marketing Revenue                                      155         169
                                                               =================

TRADING ACTIVITIES

In marketing, we enter into contracts to purchase and sell crude oil and natural gas. We also use financial and derivative contracts, including futures, forwards, swaps and options for hedging and trading purposes.

We account for all derivative contracts, not designated as hedges for accounting purposes, using mark-to-market accounting, and record the net gain or loss from their revaluation in marketing and other income. The fair value of these instruments is recorded as accounts receivable or payable. They are classified as long-term or short-term based on their anticipated settlement date.

We value derivative trading contracts daily using:

o actively quoted markets such as the New York Mercantile Exchange and the International Petroleum Exchange; and

o other external sources such as the Natural Gas Exchange, independent price publications and over-the-counter broker quotes.

[GRAPHIC OMITTED]
[Margin text: We mark-to-market all derivative contracts not designated as hedges. The gain or loss is recorded in marketing and other income.]

FAIR VALUE OF DERIVATIVE CONTRACTS

At December 31, 2004, the fair value of our derivative contracts not designated as hedges totalled $93 million (2003 - $106 million). Below is a breakdown of this fair value by valuation method and contract maturity:

(Cdn$ millions)                                                          MATURITY
----------------------------------------------------------------------------------------------------------
                                     (less than)1 year   1-3 years   4-5 years (more than)5 years   Total
                                     ---------------------------------------------------------------------
Prices
   Actively Quoted Markets                           5          (3)         --                 --       2
   From Other External Sources                      43          40           9                 (1)     91
   Based on Models and
    Other Valuation Methods                         --          --          --                 --      --
                                     ---------------------------------------------------------------------
Total                                               48          37           9                 (1)     93
                                     =====================================================================

More than 50% of the unrealized fair value relates to contracts that will settle in 2005. Contract maturities vary from a single day up to six years. Those maturing beyond one year are primarily from natural gas related positions. The relatively short maturity position of our contracts lowers our portfolio risk.

[GRAPHIC OMITTED]
[Margin text: More than 50% of our unrealized fair value is for contracts settling in 2005. This helps reduce our risk.]

At December 31, 2004, we had $6 million of unrecognized gains on our derivative contracts designated as accounting hedges of the future sale of our gas inventory. These gains will be recognized in income when the inventory is sold. These contracts were valued from actively quoted markets and settle within 12 months.

We do not use option valuation methods to record income on transportation and storage contracts.

47

CHANGES IN FAIR VALUE OF DERIVATIVE CONTRACTS

                                                                                                   Contracts
                                                               Contracts        Contracts       Entered into
                                                          Outstanding at     Entered into        During Year
                                                            Beginning of       and Closed    and Outstanding
(Cdn$ millions)                                                     Year      During Year     at End of Year           Total
-----------------------------------------------------------------------------------------------------------------------------
Fair Value at December 31, 2003                                      106               --                 --             106
Change in Fair Value of Contracts                                    (26)              77                 82             133
Net Losses (Gains) on Contracts Closed                               (69)             (77)                --            (146)
Changes in Valuation Techniques
    and Assumptions (1)                                               --               --                 --              --
                                                          -------------------------------------------------------------------
Fair Value at December 31, 2004                                       11               --                 82              93
                                                          ====================================================
Unrecognized Gains on Hedges of
   Future Sale of Inventory
    at December 31, 2004                                                                                                   6
                                                                                                              ---------------
Total Outstanding at December 31, 2004                                                                                    99
                                                                                                              ===============

Note:
(1) Our valuation methodology has been applied consistently year-over-year.

TOTAL CARRYING VALUE OF DERIVATIVE CONTRACTS

(Cdn$ millions)                                                                                        2004            2003
----------------------------------------------------------------------------------------------------------------------------
Current Assets                                                                                          177             102
Non-Current Assets                                                                                       91              63
                                                                                               -----------------------------
   Total Derivative Contract Assets                                                                     268             165
                                                                                               =============================

Current Liabilities                                                                                     129              34
Non-Current Liabilities                                                                                  46              25
                                                                                               -----------------------------
   Total Derivative Contract Liabilities                                                                175              59
                                                                                               =============================

Total Derivative Contract Net Assets (1)                                                                 93             106
                                                                                               =============================

Note:
(1) Does not include effective hedges. We recognize gains and losses on effective hedges in the same period as the hedged item.

NON-TRADING ACTIVITIES

We enter into fee-for-service contracts related to transportation and storage of third-party oil and gas. We also earn income from our power generation facility. We earned $22 million from our non-trading activities in 2004 (2003 - $21 million).

In 2003 and 2004, we increased our transportation capacity and were paid to assume future obligations associated with the capacity. We included $53 million of deferred revenue on our balance sheet to recognize the liability associated with these obligations. This deferred revenue will be amortized to earnings as the capacity is used.

[GRAPHIC OMITTED]
[Margin text: We enter into fee-for-service contracts related to transportation and storage, and increased our transportation capacity in 2003 and 2004.]

CHEMICALS

(Cdn$ millions)                                                                            2004        2003        2002
------------------------------------------------------------------------------------------------------------------------
Net Sales                                                                                   378         375         367
Sales Volumes (thousand short tons)
   Sodium chlorate                                                                          506         478         454
   Chlor-alkali                                                                             403         396         375

Operating Profit (1)                                                                        105          95         100
Operating Margin (2)                                                                         28%         25%         27%

Chemicals Contribution to Income from Continuing Operations
    Before Income Taxes                                                                      40          28          27

Capacity Utilization                                                                         95%         95%         85%
                                                                                     ------------------------------------

Notes:
(1) Total revenues less operating costs, transportation and other.

(2) Operating profit divided by net sales.

[GRAPHIC OMITTED]
[Margin text: Chemicals contribution to income before taxes 2002 - 2004]

48

2004 VS 2003 - HIGHER CHEMICALS OPERATING PROFIT INCREASED NET INCOME BY $10 MILLION

Our chemicals business benefited from strong demand for bleaching chemicals in North and South America. Solid North American demand for chlor-alkali and sodium chlorate throughout 2004 resulted in strong pricing for our products. A stronger Canadian dollar lowered our sales by $15 million in 2004, as most of our sales are denominated in US dollars while our costs are primarily in Canadian dollars.

[GRAPHIC OMITTED]
[Margin text: Solid demand for bleaching chemicals resulted in strong prices for our products in 2004.]

We successfully completed the expansion of our Brandon, Manitoba plant in October, making it the largest sodium chlorate production facility in the world. This expansion minimizes our exposure to the rising electricity costs faced in other provinces, as Manitoba enjoys stable, regulated electricity markets. We expect further margin and cash flow improvement in 2005 as we produce more of our product from this low-cost plant.

At our Brazil plant, production improvements allowed us to take advantage of strong market demand. We are changing our electricity source for our facilities and expect to contract longer-term electricity supply for most of our requirements. We expect lower annual electricity costs in 2005 when these contracts are in place.

We are considering the sale of our chemicals business in 2005. Any such sale would reduce contributions from this business to our 2005 net income.

2003 VS 2002 - LOWER CHEMICALS OPERATING PROFIT REDUCED NET INCOME BY $5 MILLION Strong North American demand for chlor-alkali and sodium chlorate helped boost sales volumes and prices in 2003. In North America, we manufacture our products in Canada. Most of our sales, however, are into US markets. A stronger Canadian dollar lowered our operating profit by $13 million, as most of our sales are denominated in US dollars.

Higher natural gas prices in North America put pressure on electricity costs. To deal with these cost pressures, we idled our Taft plant, our highest electricity cost facility, and relocated the assets to Brandon. Our cost savings from idling the plant were offset by product we purchased from other suppliers to satisfy southeastern US customers.

CORPORATE EXPENSES

GENERAL AND ADMINISTRATIVE (G&A) (1)

(Cdn$ millions)                                                                            2004        2003           2002
--------------------------------------------------------------------------------------------------------------------------
General and Administrative Expense before Stock Based Compensation                          206         176            150
Stock Based Compensation (2)                                                                 93          14              2
                                                                                     -------------------------------------
    Total General and Administrative Expense                                                299         190            152
                                                                                     =====================================

Notes:
(1) Includes G&A from discontinued operations. See Note 11 to our Consolidated Financial Statements.

(2) Includes tandem option plan, stock options for our US-based employees and stock appreciation rights.

2004 VS 2003 - HIGHER COSTS REDUCED NET INCOME BY $109 MILLION

During the second quarter, our shareholders approved modifying our stock option plan to a tandem option plan, creating a one-time G&A expense of $82 million. Our tandem option obligations are accrued on a graded vesting basis and represent the difference between the market value of our common shares and the exercise price of the options. These obligations are revalued each reporting period based on the change in the market value of our common shares and the number of graded vested options outstanding.

[GRAPHIC OMITTED]
[Margin text: Modifying our stock option plan to a tandem option plan added a one-time $82 million charge to G&A in 2004.]

Other G&A costs include increased variable incentive compensation in light of our record results, increased headcount due to increased capital investment, and higher regulatory compliance costs, including costs associated with our Sarbanes-Oxley internal control documentation project.

2003 VS 2002 - HIGHER COSTS AND LOWER RECOVERIES REDUCED NET INCOME BY $38 MILLION

Approximately 75% of the G&A increase relates to higher variable compensation:

o Record 2003 results increased bonus compensation by $16 million; and

o Strong stock prices at year-end increased the value of our employee stock appreciation rights and related expense by $13 million.

The continued expansion of our marketing group also increased our staffing costs in 2003.

49

INTEREST

(Cdn$ millions)                                    2004        2003        2002
--------------------------------------------------------------------------------
Interest (1)                                        194         212         212
   Less: Capitalized                                (51)        (43)        (31)
                                                  ------------------------------
Net Interest Expense                                143         169         181
                                                  ==============================

Effective Rate                                     6.6%        7.2%        7.1%
                                                  ------------------------------

Note:
(1) Includes dividends on preferred securities. See Note 1(r) to our Consolidated Financial Statements.

2004 VS 2003 - LOWER INTEREST EXPENSE INCREASED NET INCOME BY $26 MILLION

In late-2003 and early-2004, we refinanced our preferred securities with lower- cost debt. We also repaid US$225 million of bonds in February 2004. The refinancing of our preferred securities and the repayment of the bonds reduced interest expense in 2004.

[GRAPHIC OMITTED]
[Margin text: Our effective rate dropped to 6.6% as we refinanced our preferred securities with lower-cost debt and repaid bonds. See page 53 for details on our capital structure.]

In December 2004, we drew US$1.5 billion on our acquisition credit facilities to assist the financing of our North Sea acquisition in the UK. This increased our interest expense by $5 million.

The strong Canadian dollar lowered our US-dollar denominated interest expense by $6 million.

We capitalized interest on our Syncrude Stage 3 expansion, the Long Lake Project in Canada, our Block 51 development in Yemen and our Buzzard development in the North Sea.

2003 VS 2002 - LOWER INTEREST EXPENSE ADDED $4 MILLION TO NET INCOME

The full year impact of our 30-year notes issued in March 2002, together with the refinancing of our preferred securities with lower-cost debt in November 2003 and the impact of a strong Canadian dollar on our US-dollar denominated interest expense kept our interest costs flat.

We capitalized interest on our Syncrude Stage 3 expansion and our Gunnison development project in the Gulf of Mexico.

INCOME TAXES

(Cdn$ millions)                                      2004       2003       2002
--------------------------------------------------------------------------------
Current                                               248        214        207
Future                                                122        (73)       (44)
                                                     ---------------------------
    Total Provision for Income Taxes                  370        141        163
                                                     ===========================

Effective Rate                                        32%        20%        31%
                                                     ---------------------------

2004 VS 2003 - EFFECTIVE TAX RATE INCREASES FROM 20% TO 32%

In 2004, a 1% reduction in Alberta's corporate income tax rate resulted in a $15 million recovery of future income taxes. The low effective tax rate for 2003 resulted from reduced federal tax rates for Canadian resource activities which generated a recovery of future income taxes of $76 million. The effective tax rate for 2005 is expected to be 33%.

Most of our current income taxes are cash taxes paid in Yemen. In 2004, these totalled $227 million (2003 - $201 million; 2002 - $207 million). In 2004 and 2003, federal and provincial capital taxes were payable in Canada. In both years, current income taxes also include alternative minimum tax in the United States.

[GRAPHIC OMITTED]
[Margin text: See page 102 for breakdown of income taxes. We estimate our 2005 tax rate to be consistent with 2004.]

2003 VS 2002 - EFFECTIVE TAX RATE DECLINES FROM 31% TO 20%

The low 2003 effective tax rate was due to reduced federal tax rates for Canadian resource activities. This resulted in a recovery of future income taxes of $76 million during the second quarter of 2003.

50

OTHER INCOME

(Cdn$ millions)                                         2004      2003     2002
--------------------------------------------------------------------------------
Unrealized Mark-to-Market Gains on WTI Put Options         56       --       --
Gains (Losses) on Disposition of Assets                    24       --       (8)
Foreign Exchange Gains (Losses)                           (13)       6       (3)
Business Interruption Insurance Proceeds                   10       12        -
Interest Income                                            12        9        7
Other                                                      17       15        4
                                                      --------------------------
    Total Other Income                                    106       42       --
                                                      ==========================

We purchased WTI put options in the fourth quarter of 2004 to manage the commodity price risk exposure on part of our oil production in 2005 and 2006. These options are carried at fair value and an unrealized gain of $56 million was recognized in the fourth quarter as WTI forward prices declined late in the year.

[GRAPHIC OMITTED]
[Margin text: Unrealized mark-to-market gains on our put options make up approximately 50% of other income. These options will be revalued quarterly.]

Gains on the disposition of assets in 2004 resulted from selling minor oil and gas assets in Canada. There was no gain or loss on the 2003 sale of our southeast Saskatchewan properties as described in Note 11 to the Consolidated Financial Statements. The net loss in 2002 includes a gain of $13 million on the sale of our asphalt operation in Moose Jaw, Saskatchewan and a loss of $21 million on the sale of a non-operated property by our Canadian oil and gas business. The business interruption insurance proceeds received in 2004 and 2003 relate to damage sustained in the Gulf of Mexico during tropical storm Isidore and Hurricane Lili in the third and fourth quarters of 2002.

Foreign exchange losses in 2004 mainly relate to the impact of a stronger Canadian dollar on our US-dollar cash balances. Foreign exchange gains on our US-dollar debt portfolio are not recognized in our net income as our US-dollar debt has been designated as a hedge of our net investment in foreign operations. These gains are recorded on our balance sheet as cumulative foreign currency translation adjustments.

IMPACT OF FOREIGN EXCHANGE ON OPERATIONS

The strengthening Canadian dollar relative to the US dollar reduced cash flow from operating activities by $200 million and our net income by $105 million. This is because our foreign revenues and realized commodity prices, referenced in US dollars, were lower when translated to Canadian dollars. However, we benefit to the extent that our foreign operating costs and capital expenditures are also reduced when translated. In addition, most of our fixed-rate debt is denominated in US dollars so the Canadian dollar equivalent of this debt is reduced with a strengthening Canadian dollar. We have designated our US-dollar denominated debt as a hedge of our net investment in foreign operations. As a result, unrealized foreign exchange gains on the translation of this debt are not included in our net income. These unrealized gains are included as cumulative foreign currency translation adjustments on our balance sheet. The tax effect of unrealized foreign exchange gains on our US-dollar debt results in a decrease to our future income tax assets. This decrease in our future income tax assets is offset by a decrease to our cumulative translation adjustment account.

[GRAPHIC OMITTED]
[Margin text: A stronger Canadian dollar negatively impacts our realized commodity prices, and positively impacts our US-dollar denominated fixed-rate debt, operating costs and capital expenditures.]

OUTLOOK FOR 2005

In 2005, we plan to invest approximately $2.6 billion in capital projects, an increase of over $900 million compared to 2004, excluding acquisitions. Approximately 20% of this capital will be directed toward sustaining production and cash flow from our producing oil, gas and other assets in the short term. The majority, however, will be invested in longer cycle-time growth opportunities that we expect to begin contributing production and cash flow in 2006 and beyond. In 2005, our oil and gas capital program is expected to be invested as follows:

o 65% in new growth development projects;

o 18% in core assets to maintain existing production levels; and

o 17% in new growth exploration projects.

Details of our 2005 capital investment program are included in the Capital Investment section of the MD&A.

[GRAPHIC OMITTED]
[Margin text: See page 32 for details of our 2005 capital program.]

We plan to raise $1.5 billion in 2005 by selling assets which may include, among other things, our chemicals business and certain conventional Canadian oil and gas assets. The capital, cash flow and production guidance which follows does not take into account any dispositions.

51

DAILY PRODUCTION

Approximately 20% of our cash flow from core assets will be reinvested in those assets in 2005. This will deliver production before royalties of between 230,000 and 250,000 boe/d (170,000-185,000 after royalties) in 2005 before planned asset sales.

                                                   2005 ESTIMATED PRODUCTION
                                         ---------------------------------------
(mboe/d)                                 BEFORE ROYALTIES        AFTER ROYALTIES
--------------------------------------------------------------------------------
Gulf of Mexico (1)                              50  -  60               43 -  53
UK North Sea                                    14  -  18               14 -  18
Yemen                                           90  - 100               52 -  58
Canada (2)                                      52  -  56               40 -  44
Syncrude                                        16  -  18               16 -  17
Colombia                                         4  -   6                4 -   5
                                         ---------------------------------------
Total                                          230  - 250              170 - 185
                                         =======================================

Notes:
(1) US natural gas production is estimated to comprise 46% of total US equivalent production in 2005.

(2) Canadian natural gas production is estimated to comprise 44% of total Canadian equivalent production in 2005.

[GRAPHIC OMITTED]
[Margin text: In 2005, we expect to modestly grow production after royalties and generate over $2 billion in cash flow from operating activities.]

We expect our production after royalties to grow modestly in 2005, while we continue to invest in major development projects which are expected to come on stream in 2006 and beyond. Many of these have low or no royalties, lower costs and ultimately higher margins and returns than our current producing assets. This changing production mix is expected to improve profitability, even if oil prices trend somewhat lower.

CASH FLOW AND SENSITIVITIES

We expect to generate over $2 billion in cash flow from operating activities in 2005 (before asset sales, site restoration and geological and geophysical expenditures), assuming the following:

---------------------------------------------------------------------------
WTI (US$/bbl)                                                        40.00
NYMEX natural gas (US$/mmbtu)                                         6.50
US to Canadian dollar exchange rate                                   0.80

We have purchased put options on 60,000 bbls/d of our oil production in both 2005 and 2006. These options establish an average WTI floor price for this production of US$43.17/bbl in 2005 and US$38.17 in 2006. Changes in actual commodity prices and exchange rates impact our annual cash flow from operating activities as follows:

(Cdn$ millions)

--------------------------------------------------------------------------
WTI - US$1 change above US$43.17                                       50
WTI - US$1 change below US$43.17                                       25
NYMEX natural gas - US$0.10 change                                     10
Exchange rate - $0.01 change                                           25

In addition to strong cash flow from our oil and gas operations, we expect continued strong performance from our chemicals and marketing businesses in 2005. Our chemicals operations expect another year of solid stable cash flow and net income as we continue to see strong demand and pricing for our products. Our Brandon plant will provide lower cost operations. Our marketing group also anticipates another profitable year as they continue to maximize the value of their asset base.

[GRAPHIC OMITTED]
[Margin text: A US$1 change in WTI above $43/bbl will change cash flow from operating activities by $50 million.]

52

LIQUIDITY AND CAPITAL RESOURCES

CAPITAL STRUCTURE

(Cdn$ millions)                                                2004        2003
--------------------------------------------------------------------------------
NET DEBT (1)
   Bank Debt                                                  1,993          --
   Public Senior Notes                                        1,813       2,214
                                                              ------------------
     Senior Debt                                              3,806       2,214
   Subordinated Debt                                            553         594
   Preferred Securities                                          --         281
                                                              ------------------
     Total Debt                                               4,359       3,089
   Less: Cash and Cash Equivalents                              (74)     (1,087)
   Less: Non-Cash Working Capital (2)                           (66)       (312)
                                                              ------------------
TOTAL NET DEBT                                                4,219       1,690
                                                              ==================

SHAREHOLDERS' EQUITY (3)                                      2,867       2,075
                                                              ==================

Notes:
(1) Includes all of our debt and is calculated as long-term debt less net working capital.

(2) Excludes current portion of long-term debt and short-term borrowings.

(3) At January 31, 2005, there were 129,415,565 common shares and US$460 million of unsecured subordinated securities outstanding. These subordinated securities may be redeemed by issuing common shares at our option after November 8, 2008. The number of shares issuable depends on the common share price on the redemption date.

[GRAPHIC OMITTED]
[Margin text: Net debt is long-term debt less working capital. We use it to monitor the strength of our balance sheet]

NET DEBT

We use net debt as a key indicator of our leverage levels and to monitor the strength of our balance sheet. Our net debt levels are directly related to our operating cash flows, our capital investment activities and disposition programs. We ended the year with net debt at $4.2 billion, an increase of $2.5 billion over 2003 year-end levels. This reflects our North Sea acquisition on December 1, 2004, which was financed with US$1.5 billion of debt and US$600 million of cash on hand. Changes in net debt related to:

(Cdn$ millions)                                                          2004      2003
----------------------------------------------------------------------------------------
Capital Investment (including North Sea acquisition)                    4,264     1,494
Cash Flow from Operating Activities                                    (1,607)   (1,405)
                                                                       -----------------
Excess of Capital Investment over Cash Flow                             2,657        89

Dividends on Common Shares                                                 52        40
Proceeds on Disposition of Assets                                         (34)     (293)
Issue of Common Shares (primarily exercise of employee stock options)    (124)      (73)
Foreign Exchange Translation of US-Dollar Debt and Cash                   (78)     (281)
Other                                                                      56      (240)
                                                                       -----------------
Increase (Decrease) in Net Debt                                         2,529      (758)
                                                                       =================

[GRAPHIC OMITTED]
[Margin text: We financed the North Sea acquisition with US$600 million in cash and US$1.5 billion of debt.]

The increase in net debt has impacted our leverage metrics:

(times)                                                       2004      2003       2002
----------------------------------------------------------------------------------------
Net Debt to Cash Flow from Operating Activities                2.6       1.2        2.0
Interest Coverage (1)                                         11.9      10.1        7.9
                                                              --------------------------

Note:
(1) Earnings before interest, taxes, DD&A and exploration expense divided by interest expense (before capitalized interest).

Our business strategy is focused on value-based growth through full-cycle exploration and development, supplemented by strategic acquisitions when appropriate. To grow our company, we used leverage to develop the Masila project in Yemen in 1993, acquire Wascana in 1997 and acquire the remaining interest in Aspen in 2002. Each time, we exceeded our internal net debt to cash flow target band, however, we successfully brought our leverage back down once these projects began generating cash flow. In 2004, we again elevated our leverage levels as a result of our North Sea acquisition. We plan to sell $1.5 billion of assets in 2005 to reduce our leverage. Leverage is expected to be reduced further when our Buzzard and Long Lake projects come on stream and contribute cash flow in 2006 and 2007.

53

CHANGE IN WORKING CAPITAL

                                                                                      INCREASE/
(Cdn$ millions)                                               2004          2003     (DECREASE)
-----------------------------------------------------------------------------------------------
Cash and Cash Equivalents                                        74        1,087        (1,013)
Accounts Receivable                                           2,136        1,423           713
Inventories and Supplies                                        351          270            81
Accounts Payable and Accrued Liabilities                     (2,416)      (1,404)       (1,012)
Other                                                            (5)          23           (28)
                                                             -----------------------------------
                                                                140        1,399        (1,259)
                                                             ===================================

Cash and cash equivalents decreased by over $1 billion during the year as we:

o repaid US$225 million of senior debt in February;

o redeemed US$217 million of preferred securities in February; and

o paid US$600 million relating to our North Sea acquisition.

Accounts receivable and accounts payable increased, reflecting higher commodity prices and increased activity for our gas marketing business. We also acquired accounts receivable and accounts payable as part of our North Sea acquisition. Capital accruals were higher at year-end from our Buzzard and Long Lake development projects, and as a result of increased exploration activity in the Gulf of Mexico. Inventory levels in the marketing group were up at year-end given higher activity during the last part of 2004.

[GRAPHIC OMITTED]
[Margin text: Increased payables and receivables reflect higher commodity prices and increased activity for our gas marketing business.]

LIQUIDITY

We generally rely on operating cash flows to fund capital requirements and provide liquidity. We build our opportunity portfolio to provide a balance of short-term, mid-term, and longer-term growth. Given the long cycle-time of some of our development projects and the volatility of commodity prices, it is not unusual, in any given year, for capital expenditures to exceed our cash flow. When this happens, we draw on available credit facilities, as we maintain significant undrawn committed credit facilities. From time to time, we access the capital markets to meet our financing needs. We also use various financial instruments to minimize our exposure to fluctuations in foreign exchange and commodity prices. For example, we purchased WTI put options for 2005 and 2006 to mitigate liquidity risk and reduce cash flow volatility. Overall, we manage our capital structure to maintain flexibility so we can fund our capital programs throughout the highs and lows of the price cycles inherent in the oil and gas business.

[GRAPHIC OMITTED]
[Margin text: We manage our capital structure to maintain flexibility so we can fund our capital program through the commodity price cycles.]

The following table shows how we use our cash flow from operating activities to fund our investing activities. When our operating cash flows exceed our investment requirements, we generally pay down debt. We generally borrow to fund investment requirements in excess of our operating cash flows.

(Cdn$ millions)                                       2004         2003         2002      2001      2000
---------------------------------------------------------------------------------------------------------
Cash Flow from Operating Activities                  1,607        1,405       1,250      1,496     1,261
Cash Flow from Investing Activities                 (4,013)      (1,219)     (1,569)    (1,469)     (897)
                                                    -----------------------------------------------------
                                                    (2,406)         186        (319)        27       364

Cash Flow from Financing Activities                  1,426        1,006         329       (100)     (359)
                                                    -----------------------------------------------------
                                                    -----------------------------------------------------
                                                      (980)       1,192          10        (73)        5
                                                    =====================================================

In 2000, strong commodity prices allowed us to generate sufficient cash flow to buy back 20 million common shares. In 2001 and 2002, we began to invest significantly in two deep-water Gulf of Mexico projects (Aspen and Gunnison), our Syncrude expansion and our Long Lake project. In 2001, we used our cash flow and in 2002, we accessed the public debt markets to fund this investment activity. In 2003, Aspen contributed significantly to our cash flow and in late-2003, we pre-funded debt repayments by raising over $1 billion in senior and subordinated debt. We used these funds in 2004 to repay higher cost debt, and coupled with our acquisition credit facilities, acquired the North Sea assets.

54

FUTURE LIQUIDITY

Our future liquidity is primarily dependent on cash flows generated from our operations, our capital programs and the flexibility of our capital structure. Assuming WTI of US$40/bbl in 2005, we expect our 2005 capital investment program and dividend requirements to exceed our cash flow by almost $600 million. We are planning to raise $1.5 billion from asset dispositions in 2005 and we expect to use the proceeds to fund the shortfall and to retire debt.

Our cash flow is sensitive to changes in commodity prices and exchange rates. For 2005, we expect to generate cash flow of over $2.0 billion (before asset sales, remediation and geological and geophysical expenditures) assuming the following:

--------------------------------------------------------------------------
WTI (US$/bbl)                                                       40.00
NYMEX natural gas (US$/mmbtu)                                        6.50
US to Canadian dollar exchange rate                                  0.80

Changes in commodity prices and exchange rates will impact our cash flow and our borrowing requirements. The impact of a variance in any one of the above assumptions on our cash flow is described in the Outlook for 2005 section of the MD&A.

[GRAPHIC OMITTED]
[Margin text: See page 52 for our commodity price and foreign exchange sensitivities.]

We are in the midst of developing a number of major projects. Much of our planned capital spending over the next three years will be allocated to Long Lake, the Buzzard project in the North Sea and Syncrude Stage 3.

Our anticipated spending on these projects in 2005, 2006 and 2007 is as follows:

(Cdn$ millions)

---------------------------------------------------------------------------
2005                                                                 1,388
2006                                                                 1,125
2007                                                                   415
                                                                    -------
Total Capital Investment                                             2,928
                                                                    =======

Given our reliance on cash flows to fund these projects, we executed a cash flow protection strategy using WTI crude oil put options in late-2004. These put options provide us with an annual average WTI floor price of US$43.17/bbl in 2005 and US$38.17 in 2006 on 60,000 bbls of oil per day each year. This strategy reduces the downside risk to our future cash flows in 2005 and 2006 when our capital requirements are high, yet still allows us to realize price upside.

[GRAPHIC OMITTED]
[Margin text: Our put options reduce downside price risk in 2005 and 2006 yet enable us to realize price upside.]

Our Buzzard project creates foreign currency exposure as a portion of the capital costs are denominated in British pounds and Euros. In order to reduce our exposure to fluctuations in these currencies, we purchased foreign currency call options in early 2005 which effectively set a ceiling on most of our British pound and Euro spending exposure from March 2005 through to the end of 2006.

While these development projects lack exploration risk, they are subject to execution risk, the risk of higher than anticipated spending or delayed start-up. We minimize the financial impact of these risks by maintaining undrawn committed credit facilities. These facilities extend beyond the expected start-up dates of our Syncrude expansion, our Long Lake project and the Buzzard development. Undrawn amounts on these facilities at December 31, 2004 were almost $1.6 billion. We also have a committed credit facility available until late-2007 which may be used to finance the development and operation of our North Sea assets including Buzzard. At December 31, 2004, US$500 million was available on this facility.

In addition to our operating cash flows and our sizeable undrawn committed credit facilities, we have a US$1 billion shelf registration available in the US and Canada to allow us to access the debt capital markets.

[GRAPHIC OMITTED]
[Margin text: If required, we have more than $2 billion in undrawn credit facilities and a US$1 billion shelf registration in the US and Canada to access debt markets.]

55

At December 31, 2004, the average term to maturity of our long-term debt was 11.9 years. We have the following debt maturities in the next five years:

(Cdn$ millions)                           2005     2006    2007     2008    2009
--------------------------------------------------------------------------------
Acquisition Credit Facilities              903       --     903       --      --
Term Credit Facilities (1)                  --       --      22       65      --
Debentures                                  --       93      --       --      --
Medium Term Notes                           --       --     150      125      --
                                          --------------------------------------
Total                                      903       93   1,075      190      --
                                          ======================================

Note:
(1) Undrawn amounts of $0.4 billion available until 2008 and $1.2 billion available until 2009.

We may retire our debt maturities with a portion of the proceeds from planned asset sales or we may refinance the maturities with longer term debt. In addition, we have sufficient capacity on our term credit facilities to refinance a portion of these maturities, if need be.

In light of our cash flow streams, our commodity price and foreign exchange hedging strategies and our current levels of liquidity, we expect to have no difficulties funding our planned capital programs, dividend requirements and debt repayments or in meeting the obligations that arise from our day-to-day operations.

In 2004, we declared common share dividends of $0.40 per common share (2003 - $0.325, 2002 - $0.30). We expect to declare common share dividends of $0.40 per common share in 2005.

[GRAPHIC OMITTED]
[We expect to declare common share dividends of $0.40 per common share in 2005.]

CONTRACTUAL OBLIGATIONS, COMMITMENTS AND GUARANTEES

We assume various contractual obligations and commitments in the normal course of our operations and financing activities. These obligations and commitments are considered in assessing our cash requirements, as noted in the above discussion of future liquidity. They include:

(Cdn$ millions)                                                              PAYMENTS
-----------------------------------------------------------------------------------------------------------------
                                                              (less than)                             (more than)
                                                   Total          1 year   1-3 years     4-5 years       5 years
                                                   --------------------------------------------------------------
Short and Long-Term Debt                              4,359        1,003       1,168           190         1,998
Interest on Short and Long-Term Debt                  3,789          221         401           278         2,889
Operating Leases (1)                                    248           31          53            45           119
Energy Commodity Contracts                              175          129          42             4            --
Transportation and Storage Commitments (1)              780          366         200            84           130
Work Commitments and Purchase Obligations (2)         1,794          958         832             4            --
Asset Retirement Obligations                            770           47          32            42           649
Other                                                     5            1           1             1             2
                                                   --------------------------------------------------------------
Total                                                11,920        2,756       2,729           648         5,787
                                                   ==============================================================

Notes:
(1) Payments for operating leases and transportation commitments are deducted from our cash flow from operating activities.

(2) The vast majority of these payments relate to work commitments cancellable at our option without penalties or additional fees.

Contractual obligations can be financial or non-financial. Financial obligations are known future cash payments that we must make under existing contracts, such as debt and lease arrangements. Non-financial obligations are contractual obligations to perform specified activities such as work commitments. Commercial commitments are contingent obligations that become payable only if certain pre-defined events occur.

o Short and long-term debt amounts are included on our December 31, 2004 Consolidated Balance Sheet.

o Operating leases include the minimum lease payment obligations associated with leases for office space, rail cars, vehicles and our processing agreement with Shell that allows our Aspen production to flow through Shell's processing facilities at the Bullwinkle platform. The terms of the processing agreement give Shell an annual option to take payment in cash or in kind. For 2005, Shell has elected to take payment in kind so the 2005 obligation has been excluded from this table. Instead, it is shown as a royalty and excluded from reserves and production.

o Energy commodity contracts include the purchase and sale of physical quantities of oil and natural gas, and financial derivatives used to manage our exposure to commodity prices. For contracts where the price is based on an index, the amount is based on forward market prices at December 31, 2004. For certain contracts, we may net settle rather than pay cash.

o Our marketing operation manages various natural gas transportation and storage commitments on behalf of our Canadian oil and gas business and a number of third-party customers.

[GRAPHIC OMITTED]
[Margin text: Our long-term debt accounts for almost 70% of our contractual obligations and commitments.]

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o Work commitments include non-discretionary capital spending related to drilling, seismic, construction of facilities and other development commitments in our international operations, at Long Lake ($274 million), the Buzzard project in the North Sea ($1 billion) and at Block 51 ($189 million). The timing of certain payments is difficult to determine with certainty. The table has been prepared using our best estimates; the remainder of our 2005 capital investment is discretionary.

o We have $770 million of undiscounted asset retirement obligations. As of December 31, 2004, the estimated fair value ($468 million) of these obligations has been provided for in our consolidated financial statements (including $47 million of current liabilities). The timing of any payments is difficult to determine with certainty and the table has been prepared using our best estimates.

o We have unfunded obligations under our defined benefit pension and post retirement benefit plans of $46 million and our share of Syncrude's unfunded obligation is $41 million. Our $46 million obligation includes $34 million that is unfunded as a result of statutory limitations. These obligations are backed by irrevocable letters of credit. During 2004, we contributed $6 million to our defined benefit pension plan. We currently are not anticipating any funding requirements in 2005 for our defined benefit pension plan.

o We have excluded our unvested obligations on our stock option and stock appreciation rights programs as the amount and timing of the cash payments are indeterminable.

o We have excluded our normal purchase arrangements as they are discretionary and are reflected in our expected cash flow from operating activities and our capital expenditures for 2005.

o We have excluded our future income tax liabilities as the amount and timing of any cash payments for income taxes are based primarily on taxable income for each discrete fiscal year in the various jurisdictions in which we operate.

From time to time we enter into contracts that require us to indemnify parties against possible claims, particularly when these contracts relate to the sale of assets. On occasion, we provide indemnifications to the purchaser. Generally, a maximum obligation is not stated, therefore, the overall maximum amount cannot be reasonably estimated. We have not made any significant payments related to these indemnifications. Our Risk Management Committee actively monitors our exposure to the above risks and obtains insurance coverage to satisfy potential or future claims as necessary. We believe these matters would not have a material adverse effect on our liquidity, financial condition or results.

CREDIT RATINGS

Currently, our senior debt is rated BBB- by Standard & Poor's (S&P), Baa2 by Moody's Investor Service, Inc. and BBB by Dominion Bond Rating Service (DBRS). In addition, S&P currently rates our outlook as stable while Moody's and DBRS have a negative outlook. Our strong financial results, ample liquidity and financial flexibility continue to support our credit rating.

[GRAPHIC OMITTED]
[Margin text: Credit Rating: S&P: BBB-, Moody's: Baa2, DBRS: BBB]

FINANCIAL ASSURANCE PROVISIONS IN COMMERCIAL CONTRACTS

The commercial agreements our marketing group enters into often include financial assurance provisions that allow Nexen and our counterparties to effectively manage credit risk. The agreements normally require posting collateral if a buyer's credit rating drops below investment grade, indicating their creditworthiness has deteriorated. Based on the contracts in place and commodity prices at December 31, 2004, we would be required to post collateral of approximately $780 million if we were downgraded to non-investment grade. These obligations are reflected on our balance sheet. The posting of collateral merely accelerates the payment of such amounts. Our committed undrawn credit facilities available for general corporate purposes of $1.6 billion adequately cover any potential collateral requirements. Just as we may be required to post collateral in the event of a downgrade below investment grade, we have similar provisions in many of our contracts that allow us to demand certain counterparties post collateral with us if they are downgraded to non-investment grade.

OFF-BALANCE SHEET ARRANGEMENTS

None.

CONTINGENCIES

We have no contingencies that would have a material adverse effect on our liquidity, consolidated financial position or results of operations. See Note 12 to the Consolidated Financial Statements in Item 8, which is incorporated herein by reference for a discussion of our contingencies.

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BUSINESS RISK MANAGEMENT

Our operations are exposed to various risks, some of which are common to others in our industry and some of which are unique to our operations. We attempt to mitigate the risks to an acceptable level but many of these risks are beyond our control so we cannot provide any assurances that they will not result in negative financial consequences.

COMPETITION

The oil and gas industry is highly competitive, particularly in the following areas:

o searching for and developing new sources of crude oil and natural gas reserves;

o constructing and operating crude oil and natural gas pipelines and facilities; and

o transporting and marketing crude oil, natural gas and other petroleum products.

Our competitors include major integrated oil and gas companies and numerous other independent oil and gas companies. The petroleum industry also competes with other industries in supplying energy, fuel and related products to customers.

The pulp and paper chemicals market is also highly competitive. Key success factors are:

o price;

o product quality; and

o logistics and reliability of supply.

We are one of the largest producers of sodium chlorate in North America and have continent-wide supply capability.

Competitive forces may result in shortages of prospects to drill, services to carry out exploration, development or operating activities, and infrastructure to produce and transport production. It may also result in an oversupply of crude oil and natural gas. Each of these factors could have a negative impact on costs and prices and, therefore, our financial results.

OPERATIONAL RISKS

Acquiring, developing and exploring for oil and natural gas involves many risks. These include:

o encountering unexpected formations or pressures;

o premature declines of reservoirs;

o blow-outs, well bore collapse, equipment failures and other accidents;

o craterings and sour gas releases;

o uncontrollable flows of oil, natural gas or well fluids; and

o environmental risks.

We operate two facilities that are located in close proximity to populated areas, and each processes materials of potential harm to the local populations. At Balzac, just north of Calgary, we operate a gas plant that processes sour gas. In North Vancouver, we operate a chlor-alkali plant that produces chlorine. We have undertaken several initiatives to mitigate the potential risks associated with these operations. First, we have instituted operating procedures that have allowed each to be verified as Responsible Care(R) facilities by the Canadian Chemical Producers Association, with our Balzac plant being the first oil and gas facility in the world to be so certified. Also, at North Vancouver, we conducted extensive quantified risk analysis complying with guidelines of the Major Industrial Accidents Council of Canada (MIACC). As a result, substantial changes to operating and inventory practices were implemented. The risk is now consistent with Responsible Care(R) and MIACC guidelines. Also, at both facilities, we work with surrounding communities to keep them informed of our operations and have invited them to tour our facilities. Finally, we continually work with local municipalities to maintain appropriate emergency response and evacuation plans in the event of an accidental release of chemicals from the facilities.

Although we maintain insurance according to customary industry practice, we may not be fully insured against all of these risks. Losses resulting from the occurrence of these risks may have a material adverse impact on our financial results.

OFFSHORE OPERATIONS

Offshore operations are subject to a variety of operating risks peculiar to the marine environment, such as damage or loss from hurricanes or other adverse weather conditions. These conditions can cause substantial damage to facilities and interrupt production. When possible, we take precautionary measures of temporarily shutting-in production, de-manning facilities and ceasing drilling operations. We carry insurance to compensate us for physical damage and business interruption, subject to normal deductions, resulting from such weather conditions.

Our operations in the Gulf of Mexico have been suspended, from time to time, due to hurricanes or tropical storms. While operations are generally restored quickly and production losses are not material, we have had one instance in the last five years where production was suspended for an extended period of time and substantial damage to facilities was incurred. In 2002, our facilities at Eugene Island 295 were damaged during Hurricane Lili. Production from this field was suspended for about four months while temporary production facilities were put in place. During this period, production volumes were reduced by approximately 2,500 boe/d. Production was restored at a reduced rate through temporary facilities for approximately six months while installation of new permanent facilities was completed. It is estimated that volumes were reduced by approximately 1,800 boe/d during this period. There was no significant financial impact after business interruption and property insurance claims.

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UNCERTAINTY OF RESERVES ESTIMATES

Our future crude oil and natural gas reserves and production, and therefore our operating cash flows and results of operations, are highly dependent upon our success in exploiting our current reserve base and acquiring or discovering additional reserves. Without reserve additions through exploration, acquisition or development activities, our reserves and production will decline over time as reserves are produced. The business of exploring for, developing or acquiring reserves is capital intensive. To the extent cash flows from operations are insufficient and external sources of capital become limited or unavailable, our ability to make the necessary capital investments to maintain and expand our oil and natural gas reserves will be impaired.

Over the past three years, we experienced net negative revisions of 337 million boe to our proved reserves (including Syncrude and before royalties). This includes 239 million boe related to changes in year-end prices, of which 246 million boe relates to the write-off of the reserves at our Long Lake oil sands project as a result of low bitumen prices at the end of 2004. Positive price revisions of 7 million boe related primarily to our Canadian heavy oil properties. The remaining negative revisions of 98 million boe, representing about 12% of worldwide proved reserves, occurred primarily on our producing properties in Canada and Yemen. In Canada, the majority of the negative revisions of 64 million boe occurred in 2003 as result of an ongoing assessment of the future production profiles of our properties and a reduction of proved undeveloped reserves based on drilling results and updated geological mapping. In Yemen, the negative revisions of 37 million boe occurred largely in 2003 and 2004 and resulted primarily from lower-than-expected production performance, drilling results and updated geological mapping.

About two-thirds of the 98 million boe of net negative revisions were recognized as proved reserves based on projected future production performance of producing properties. These projections considered historical performance and expected future changes in production using all available engineering and geological data. However, subsequent production performance did not meet our projections due to such factors as sand production, steeper than expected declines due to higher water cuts and the drilling of some infill locations which proved to have already been swept. The remainder of the reserves were recognized as proved undeveloped reserves based on production performance, well control and geologic mapping using seismic and other data. Lower than expected production, greater sweep efficiencies, and unsuccessful drilling caused us to revise our proved reserves estimates downward.

Under SEC rules, we recognize our oil sands as bituman reserves. As a result, we expect price-related revisions, both positive and negative, to occur in the future as the economic producibility of our bitumen and heavy oil reserves are sensitive to year-end prices. In particular, since we recognize our oil sands as bitumen reserves and they are related to one project, all or none of the reserves will likely be considered economic depending on the year-end prices of bitumen, diluent and natural gas. The impact of year-end prices on our heavy oil reserves is expected to be immaterial.

INCREASED LEVERAGE

Our overall indebtedness has increased as a result of acquiring the North Sea assets. Additional borrowings may be necessary to fund the field development plan for the Buzzard field as well as for the development of the Long Lake project. While we believe that our overall indebtedness can be reduced through proceeds from the disposition of non-core assets, no assurance can be given that we will be able to implement such transactions.

HEAVY OIL OPERATIONS

Heavy oil is characterized by high specific gravity or weight and high viscosity or resistance to flow. Because of these features, heavy oil is more difficult and expensive to extract, transport and refine than other types of oil. Heavy oil also yields a lower price relative to light oil and gas, as a smaller percentage of high-value petroleum products can be refined from heavy oil. As a result, our heavy oil operations are exposed to the following risks:

o additional costs may be incurred to purchase diluent to transport heavy oil;

o there could be a shortfall in the supply of diluent which may cause its price to increase; and

o the market for heavy oil is more limited than for light oil making it more susceptible to supply and demand fundamentals which may cause the price to decline.

Any one or combination of these factors could cause some of our heavy oil properties to become uneconomic to produce and/or result in negative reserve revisions.

Additional risk factors relating to our Long Lake oil sands project are provided under "Risk Factors Relating to Long Lake".

RISK FACTORS RELATING TO LONG LAKE

Our Long Lake Project is planned as a fully integrated production, upgrading and co-generation facility. We intend to use Steam Assisted Gravity Drainage (SAGD) technology to recover bitumen from oil sands. As designed, the bitumen will be partially upgraded using the proprietary OrCrude(TM) process, followed by conventional hydrocracking to produce a sweet, premium synthetic crude oil. The OrCrude(TM) process also yields liquid asphaltines that will be gasified into a syngas. This syngas will be used as a fuel source for the SAGD process, a source of hydrogen for use in the upgrading process, and to generate electricity through a co-generation facility.

We have a 50% working interest in this project, and our share of the construction cost is estimated to be $1.75 billion ($3.5 billion gross). Given the higher initial investment and operating costs to produce and upgrade bitumen, the payout period for the project is longer and the economic return is lower than a conventional light oil project with an equal volume of reserves.

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Risks associated with our Long Lake oil sands project include the following:

STATUS OF THE LONG LAKE PROJECT

The Long Lake Project is currently in the construction stage. There is a risk that actual costs may be higher than expected or that the project may not be completed on time or at all due to many factors, including:

o construction performance falling below expected levels of output or efficiency;

o labour disputes, disruptions or declines in productivity;

o increases in materials or labour costs;

o inability to attract sufficient numbers of qualified workers;

o design errors;

o contractor or operator errors;

o non-performance by third-party contractors;

o changes in project scope;

o delays in obtaining, or conditions imposed by, regulatory approvals;

o breakdown or failure of equipment or processes;

o violation of permit requirements;

o catastrophic events such as fires, earthquakes, storms or explosions; and

o disruption in the supply of energy.

Actual costs to construct and develop the project will vary from our estimates, and such variances may be significant. Our estimate of the cost associated with developing the Long Lake Project has been developed with an expected range of accuracy of approximately +/- 15%. In the formative stage of the project, our capital cost estimate was approximately $2.3 billion (gross). After completing further project definition, engineering and reviewing pilot results, we changed the scope of the project to include co-generation facilities, planned for certain redundancies within the upgrader, and applied more conservative estimates to labour productivity. As a result, the capital cost estimate at the time of our Board's sanctioning the project in February 2004 was $3.4 billion
(gross). Our current capital cost estimate for completing the project is $3.5 billion (gross) reflecting the acceleration of drilling of an additional well pad consisting of 13 well pairs to ensure certainty and reliability of bitumen production at the commencement of upgrader operations.

SAGD BITUMEN RECOVERY PROCESS

SAGD has been used in Western Canada to increase recoveries from conventional heavy oil reservoirs for over a decade. However, application of SAGD to the in-situ recovery of bitumen from oil sands is relatively new. Most of the SAGD oil sands applications to date have been pilot projects and the process is in the early stages of application in commercial oil sands projects.

Our estimates for performance and recoverable volumes for the Long Lake Project are based primarily on our three well-pair SAGD pilot and industry performance from SAGD operations in the McMurray formation in the Athabasca oilsands. Using this data, our assumptions included average well-pair productivity of 900 bbls/d of bitumen and a steam-to-oil ratio of 2.5. We commenced steaming the reservoir for our SAGD pilot in May 2003 and commenced production in September 2003. The pilot is currently producing at a rate of about 600 barrels of bitumen per day per well-pair and a steam-to-oil ratio of about 3.5. Since September 2003, the pilot has recovered less than 2% of the original bitumen in place. While we expect actual performance to improve as the steam chamber grows in the reservoir, there can be no assurance that our SAGD operation will produce bitumen at the expected levels or steam-to-oil ratio. If the assumed production rates or steam-to-oil ratio are not achieved, we might have to drill additional wells to maintain optimal production levels, construct additional steam generating capacity and/or purchase natural gas for additional steam generation. These could have a significant adverse impact on the future activities and economic return of the Long Lake Project.

BITUMEN UPGRADING PROCESS

The proprietary OrCrude(TM) process we are using to upgrade raw bitumen to synthetic crude will be the first commercial application of the process although we have operated it in a 500 bbls/d demonstration plant. All the individual components of the technology used in this process, are currently used in commercial applications around the world, however, there can be no assurance that the commercial upgrader being constructed at Long Lake will achieve the same or similar results as the demonstration plant or the results which are forecast. If we are unable to upgrade the bitumen for any reason we may decide to sell it as bitumen without upgrading it, which would expose us to the following risks:

o the market for bitumen is limited;

o additional costs would be incurred to purchase diluent for blending and transporting bitumen;

o there could be a shortfall in the supply of diluent which may cause its price to increase;

o the market price for bitumen is relatively low reflecting its quality differential; and

o additional costs would be incurred to purchase natural gas for use in generating steam for the SAGD process since we would not be producing syngas from the upgrading process.

These factors could have a significant adverse impact on the future activities and returns of the Long Lake Project.

If any of these factors arise, our operating costs would increase and our revenues would decrease from those we have assumed. This would cause a material decrease in expected earnings from the project and the project may not be profitable under these conditions.

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At December 31, 2004, a shortage of diluent caused the price of diluent products to rise substantially above prices seen in the past. These conditions could be repeated in the future as the demand for diluents increases with the expected increase in production of bitumen from the Canadian oil sands.

DEPENDENCE ON OPTI CANADA

We are undertaking the Long Lake Project jointly with OPTI Canada (OPTI) pursuant to a joint venture agreement governing the construction, ownership and joint operation of the project. The agreement provides for the creation of a management committee that is responsible for the supervision and direction of the management and operation of the project, the supervision and control of the operators and all other matters relating to the development of the project. If our interest in any element of the project falls below 25%, OPTI may be able to make decisions respecting that element without our input, which may adversely affect our operations.

DEPENDENCE UPON PROPRIETARY TECHNOLOGY

The success of the project and our investment in the project depends to a significant extent on the proprietary technology of OPTI and proprietary technology of third parties that has been, or is required to be, licensed by OPTI. OPTI currently relies on intellectual property rights and other contractual or proprietary rights, including (without limitation) copyright, trademark laws, trade secrets, confidentiality procedures, contractual provisions, licenses and patents, to secure the rights to utilize its proprietary technology and the proprietary technology of third parties. OPTI may have to engage in litigation in order to protect the validity of its patents or other intellectual property rights, or to determine the validity or scope of the patents or proprietary rights of third parties. This kind of litigation can be time-consuming and expensive, regardless of whether or not OPTI is successful. The process of seeking patent protection can itself be long and expensive, and there can be no assurance that any currently pending or future patent applications of OPTI or such third parties will actually result in issued patents, or that, even if patents are issued, they will be of sufficient scope or strength to provide meaningful protection or any commercial advantage to OPTI. Furthermore, others may develop technologies that are similar or superior to the technology of OPTI or such third parties or design around the patents owned by OPTI and/or such third parties. There is also a risk that OPTI may not be able to enter into licensing arrangements with third parties for the additional technologies required for the possible further expansion of the Long Lake upgrader.

OPERATIONAL HAZARDS

The operation of the project will be subject to the customary hazards of recovering, transporting and processing hydrocarbons, such as fires, explosions, gaseous leaks, migration of harmful substances, blowouts and oil spills. A casualty occurrence might result in the loss of equipment or life, as well as injury or property damage. We may not carry insurance with respect to all potential casualty occurrences and disruptions. It cannot be assured that our insurance will be sufficient to cover any such casualty occurrences or disruptions. The project could be interrupted by natural disasters or other events beyond our control. Losses and liabilities arising from uninsured or under-insured events could have a material adverse effect on the project and on our business, financial condition and results of operations.

Recovering bitumen from oil sands and upgrading the recovered bitumen into synthetic crude oil and other products involve particular risks and uncertainties. The project is susceptible to loss of production, slowdowns, or restrictions on its ability to produce higher value products due to the interdependence of its component systems. Severe climatic conditions can cause reduced production and in some situations result in higher costs. SAGD bitumen recovery facilities and development and expansion of production can entail significant capital outlays. The costs associated with synthetic crude oil production are largely fixed and, as a result, operating costs per unit are largely dependent on levels of production.

The Long Lake SAGD operation and upgrader will process large volumes of hydrocarbons at high-pressure and at high temperatures and will handle large volumes of high pressure steam. Equipment failures could result in damage to the project's facilities and liability to third parties against which we may not be able to fully insure or may elect not to insure because of high premium costs or for other reasons.

Certain components of the Long Lake Project will produce sour gas, which is gas containing hydrogen sulphide (H2S). Sour gas is a colourless, corrosive gas that is toxic at relatively low levels to plants and animals, including humans. The project will include integrated facilities for handling and treating the sour gas, including the use of gas sweetening units, sulphur recovery systems and emergency flaring systems. Failures or leaks from these systems or other exposure to sour gas produced as part of the project could result in damage to other equipment, liability to third parties, adverse effect to humans, animals and the environment, or the shut down of operations.

The Long Lake Project will produce carbon dioxide emissions. Carbon dioxide is a greenhouse gas that will be regulated by the Kyoto Protocol, which is expected to come into effect in Canada in 2008. We will be required to purchase carbon dioxide credits in connection with these emissions, which we have budgeted at approximately $0.20/bbl of oil produced. If the cost of carbon dioxide credits reaches the Canadian cap, our actual cost would increase to approximately $0.40/bbl of oil produced.

ABORIGINAL CLAIMS

Aboriginal peoples have claimed aboriginal title and rights to a substantial portion of Western Canada. Certain aboriginal peoples have filed a claim against the Government of Canada, the Province of Alberta, certain governmental entities and the regional municipality of Wood Buffalo (which includes the city of Fort McMurray, Alberta) claiming, among other things, aboriginal title to large areas of lands surrounding Fort McMurray, including the lands on which the project and most of the other oil sands operations in Alberta are located. Such claims, if successful, could have a significant adverse effect on the project and on us.

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COMPETITION

The Canadian and international petroleum industry is highly competitive in all aspects, including the exploration for, and the development of, new sources of supply, the acquisition of oil interests and the distribution and marketing of petroleum products. The Long Lake Project competes with other producers of synthetic crude oil blends and other producers of conventional crude oil. Some of the conventional producers have lower operating costs than the project is anticipated to have. The petroleum industry also competes with other industries in supplying energy, fuel and related products to consumers.

A number of companies other than OPTI and us have announced plans to enter the oil sands business and begin production of synthetic crude oil, or expand existing operations. Expansion of existing operations and development of new projects could materially increase the supply of synthetic crude oil and other competing crude oil products in the marketplace. Depending on the levels of future demand, increased supplies could have a negative impact on prices.

CONCENTRATION OF PRODUCING ASSETS

A portion of our production is generated from highly productive individual wells or central production facilities. Examples include:

o central processing facility, oil pipeline, and export terminal at our Yemen operations;

o Gunnison SPAR production platform in the Gulf of Mexico;

o highly productive Aspen wells tied-in to a third-party processing facility in the Gulf of Mexico; and

o Scott production platform in the North Sea.

As significant production is generated from each of these assets, any single event causing an interruption to these operations could result in the loss of production. We carry insurance to compensate us for physical damage and business interruption arising from most circumstances but it does not provide for losses arising from equipment failures.

COAL BED METHANE

Coal bed methane (CBM) is commonly referred to as an unconventional form of natural gas because it is primarily stored through adsorption by the coal itself rather than in the pore space of the rock like most conventional gas. The gas is released in response to a drop in pressure in the coal. If the coal is water saturated, water generally needs to be extracted to reduce the pressure and allow gas production to occur. CBM wells typically have lower producing rates and reserves per well than conventional gas wells, although this varies by area. CBM fields are likely to require between two and eight gas wells per section to efficiently extract the natural gas. Regulatory approval is required to drill more than one well per section. As a result, the timing of drilling programs and land development can be uncertain.

We are testing the feasibility of gas production from the Mannville coals in the Fort Assiniboine region of Alberta. These coals are deeper than other producing CBM projects and are water saturated. These projects require significant up-front capital investment in the form of land acquisition and drilling and completion costs. A significant period of time may be required to sufficiently de-water the coals to determine if commercial production is feasible. As a result, we may have to invest significant capital in CBM assets before they achieve commercial rates of production. The wells may never achieve commercial rates of production as there are no commercially proven Mannville CBM projects in operation.

CBM projects in some areas of the United States have had negative public reaction due to certain water disposal practices. In Canada, as in the United States, water disposal practices are regulated to ensure public safety and water conservation. Nevertheless, negative public perception around CBM production could impede our access to the resource.

COMMITMENTS TO PROJECTS UNDER DEVELOPMENT

We have significant commitments in connection with various development activities currently underway. The Syncrude Stage 3 expansion is currently 74% complete and is expected to commence production in mid-2006. Development and construction activities on the Buzzard field are approximately 60% complete and is expected to commence production in late-2006. Detailed project engineering on our Long Lake SAGD and upgrading project near Fort McMurray, Alberta is currently approximately 60% complete. Bitumen production from the Long Lake Project is expected to be achieved in the second half of 2006 and the first commercial production of upgraded synthetic crude oil is expected to be achieved in mid-2007. Our combined capital commitments for these projects are anticipated to be $1,388 million in 2005 and $1,125 million in 2006. In these projects, we are exposed to the possibility of cost overruns, which may be significant, and/or delays in commencement of commercial production.

POLITICAL RISK

We operate in numerous countries, some of which may be considered politically and economically unstable. Our operations and related assets are subject to the risks of actions by governmental authorities, insurgent groups or terrorists. We conduct our business and financial affairs to protect against political, legal, regulatory and economic risks applicable to operations in the various countries where we operate. However, there can be no assurance that we will be successful in protecting ourselves against these risks and the related financial consequences.

In particular, our operations in Yemen expose us to potential material adverse financial consequences. In 2004, Yemen accounted for $415 million or 52% of our net income and this is expected to decline somewhat in 2005 as production declines on Masila are partially offset by production from completion of development activities on Block 51.

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Our Masila operations are important to Yemen, providing 50% of the country's oil production. We are a responsible member of the Yemeni community; we build relationships with its citizens and involve them in key decisions that impact their lives. We also ensure that they benefit from our presence in their country beyond the revenue they receive from the production we operate. Our strong relationship with the people and Government of Yemen has allowed us to operate there without interruptions for almost 15 years and we anticipate this continuing.

Our practices have enabled us to operate successfully, not only in Yemen, but also in other parts of the world. We have developed excellent practices to manage the risks successfully.

ENVIRONMENTAL RISK

Environmental risks inherent in the oil and gas and chemicals industries are becoming increasingly sensitive as related laws and regulations become more stringent worldwide. Many of these laws and regulations require us to remove or remedy the effect of our activities on the environment at present and former operating sites, including dismantling production facilities and remediating damage caused by the disposal or release of specified substances.

We manage our environmental risks through a comprehensive and sophisticated Safety, Environmental and Social Responsibility (SESR) Management System that meets or exceeds ISO14001 criteria and those of similar management systems. Overall guidance and direction is provided by the SESR Committee of the Board of Directors. In addition, senior management, including the CEO and CFO, regularly meets with SESR management to review and approve SESR policies and procedures, provide strategic direction, review performance and ensure that corrective action is taken when necessary. We develop and implement proactive and preventative measures designed to reduce or eliminate future environmental liabilities, we are prudent and responsible in our management of existing environmental liabilities, and we continuously seek opportunities for performance improvement. We also maintain an ongoing awareness of external trends, demands, commitments, events or uncertainties that may reasonably have a material effect on revenues from continuing operations. These actions provide assurance that we meet or exceed appropriate environmental standards worldwide.

o At December 31, 2004, $468 million ($770 million, undiscounted) has been provided in the Consolidated Financial Statements for future asset retirement costs, relating to our oil and gas, Syncrude and chemicals facilities.

o During 2004, we increased our asset retirement obligations by $146 million (2003 - $6 million) to reflect new obligations incurred or acquired.

o Actual site remediation expenditures for the year were $31 million (2003 - $20 million). We anticipate actual site remediation expenditures in 2005 to approximate $47 million primarily in Australia and Nigeria.

o We perform periodic internal and external assessments of our operations and adjust our estimates and retirement obligations accordingly.

o During 2002, we conducted an external audit of our management systems for safety, environment and social responsibility issues. Overall, the review was positive and the few minor recommendations for improvement were implemented.

o During 2003 and 2004, we conducted an external operational audit and confirmed that our management systems for safety, environment and social responsibility issues were being followed.

CLIMATE CHANGE

The Kyoto Protocol comes into force on February 16, 2005 following Russia's delivery of its ratification instrument on November 18, 2004. Canada had previously ratified the Kyoto Protocol in December 2002. Canada committed in Kyoto in 1997 to an emission reduction of 6% below 1990 levels during the First Commitment period (2008 to 2012). Economic modeling studies have shown that if emission reductions are met through domestic action in Annex I countries alone, there will be severe negative impacts to those countries' economies, and in particular those such as Canada whose economies are resource and energy intensive. The US government's decision to withdraw from the Kyoto Protocol has serious implications for Canada in the context of a continental or hemispheric energy market.

The Canadian government has addressed the uncertainty associated with ratification and implementation of the Kyoto Protocol by providing the oil and gas sector with limits on cost (a cap of $15/tonne) and volume (a cap of 55 megatonnes for large industrial emitters) as well as its position on long-term, high capital-cost projects. In addition, emission reductions for oil and gas producers are expected to be capped at levels that are 15% lower than business as usual levels. However, the government has yet to enact national legislation that will detail the obligations of Canadian industry with respect to emission reduction and management, and it remains uncertain at this time when those obligations will be determined. The financial markets have viewed these developments favourably and have issued various analyses in the aftermath of these announcements indicating that implementation of Green House Gas (GHG)-related legislation should not adversely affect the development of new energy projects such as the oil sands.

For years, we have been assessing the impact of climate change developments on our various business interests. As a Canadian-based international oil and gas exploration and production company, we have worked closely with the Canadian Clean Development Mechanism/Joint Implementation Office of the Department of Foreign Affairs and International Trade to ensure that Canadian companies get access to low-cost/high-quality carbon offset investments. As well, we continue to work closely with the Canadian and Alberta governments to assess the impact of domestic regulatory options and provide information on our business to assist governments in their policy deliberations. We maintain a wide range of business contacts to ensure that a full slate of options is available to us in order to meet the obligations that may be imposed by future legislation.

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We have created a senior management committee (The Climate Change Steering Group) to: consider national and international developments; hear from leading experts with respect to science, business and risk issues; and, consider investment opportunities. We have voluntarily reduced direct GHG emissions by almost two million tons of (CO2) equivalent since we started reporting in 1996. As well, progress has been made toward reduction of our energy inputs per unit of production.

We have entered into discussions with the management of several GHG investment pools and we continue to evaluate the opportunities associated with biological and geological sequestration of (CO2) and the capture of methane from landfills. We continuously review the feasibility of new and ongoing projects with respect to current social, political and economic factors and will continue to take into account policy and requirements with respect to GHG when conducting these reviews.

We are committed to the principles of full disclosure and we keep our stakeholders apprised of how these issues affect us. Since emission levels applicable to our business operations have not been determined and there are no reliable estimates of the costs of achieving those levels, premature disclosure would be speculative and any financial estimates would be based on arbitrary assumptions of emission levels. However, Canadian government assurances of cost and volume limits suggest that incremental risks and liabilities attributable to addressing climate change policies are manageable. Any indirect risks and liabilities attributable to GHG are too remote and unquantifiable at this time.

CRITICAL ACCOUNTING ESTIMATES

As an oil and gas producer, there are a number of critical estimates underlying the accounting policies we apply when preparing our Consolidated Financial Statements. These critical estimates are discussed below.

OIL AND GAS ACCOUNTING - RESERVES DETERMINATION

We follow the successful efforts method of accounting for our oil and gas activities, as described in Note 1 to our Consolidated Financial Statements. Successful efforts accounting depends on the estimated reserves we believe are recoverable from our oil and gas properties.

The process of estimating reserves is complex. It requires significant judgements and decisions based on available geological, geophysical, engineering and economic data.

To estimate the economically recoverable oil and natural gas reserves and related future net cash flows, we incorporate many factors and assumptions including:

o expected reservoir characteristics based on geological, geophysical and engineering assessments;

o future production rates based on historical performance and expected future operating and investment activities;

o future oil and gas prices and quality differentials;

o assumed effects of regulation by governmental agencies; and

o future development and operating costs.

We believe these factors and assumptions are reasonable based on the information available to us at the time we prepare our estimates. However, these estimates may change substantially as additional data from ongoing development activities and production performance becomes available and as economic conditions impacting oil and gas prices and costs change.

Management is responsible for estimating the quantities of proved oil and natural gas reserves and for preparing related disclosures. Estimates and related disclosures are prepared in accordance with SEC requirements, generally accepted industry practices in the US as promulgated by the Society of Petroleum Engineers, and the standards of the Canadian Oil and Gas Evaluation Handbook modified to reflect SEC requirements.

Reserve estimates for each property are prepared at least annually by the property's reservoir engineer. They are reviewed by engineers familiar with the property and by divisional management. An Executive Reserves Committee, including our CEO, CFO and Board-appointed internal qualified reserves evaluator, meet with divisional reserves personnel to review the estimates and any changes from previous estimates.

The internal qualified reserves evaluator assesses whether our reserves estimates and the Standardized Measure of Discounted Future Net Cash Flows and Changes Therein, included in the Supplementary Financial Information, have been prepared in accordance with our reserve standards. His opinion stating that the reserves information has, in all material respects, been prepared according to our reserves standards is included in an exhibit to this Form 10-K.

We also have at least 80% of our reserve estimates audited annually by independent qualified reserves consultants. Given that the reserves estimates are based on numerous assumptions and interpretations, differences in estimates prepared by us and an independent reserves consultant are resolved when the differences are greater than 10%.

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The Board of Directors has established a Reserves Review Committee (Reserves Committee) to assist the Board and the Audit and Conduct Review Committee to oversee the annual review of our oil and gas reserves and related disclosures. The Reserves Committee is comprised of three or more directors, the majority of whom are independent, and each being familiar with estimating oil and gas reserves. The Reserves Committee meets with management periodically to review the reserves process, results and related disclosures. The Reserves Committee appoints and meets with each of the internal qualified reserves evaluator and independent reserves consultants independent of management to review the scope of their work, whether they have had access to sufficient information, the nature and satisfactory resolution of any material differences of opinion, and in the case of the independent reserves consultants, their independence.

The Reserves Committee has reviewed Nexen's procedures for preparing the reserve estimates and related disclosures. It has reviewed the information with management, and met with the internal qualified reserves evaluator and the independent qualified reserves consultants. As a result of this, the Reserves Committee is satisfied that the internally-estimated reserves are reliable and free of material misstatement. Based on the recommendation of the Reserves Committee, the Board has approved the reserves estimates and related disclosures in the Form 10-K.

Reserves estimates are critical to many of our accounting estimates, including:

o Determining whether or not an exploratory well has found economically producible reserves. If successful, we capitalize the costs of the well, and if not, we expense the costs immediately. In 2004, $125 million of our total $175 million spent on exploration drilling was expensed in the year. If none of our drilling had been successful, our net income would have decreased by $33 million after tax.

o Calculating our unit-of-production depletion rates. Both proved and proved developed reserve (1) estimates are used to determine rates that are applied to each unit-of-production in calculating our depletion expense. Proved reserves are used where a property is acquired and proved developed reserves are used where a property is drilled and developed. In 2004, oil and gas depletion of $541 million was recorded in depletion, depreciation, amortization and impairment expense. If our reserves estimates changed by 10%, our depletion, depreciation, amortization and impairment expense would have changed by approximately $38 million, after tax, assuming no other changes to our reserves profiles.

o Assessing, when necessary, our oil and gas assets for impairment. Estimated future undiscounted cash flows are determined using proved reserves. The critical estimates used to assess impairment, including the impact of changes in reserve estimates, are discussed below.

Since we do not have any loan covenants directly linked to reserves, it would take a very significant decrease in our proved reserves to limit our ability to borrow money under our term credit facilities, as previously described in the Liquidity section of the MD&A.

OIL AND GAS ACCOUNTING - EVALUATION OF EXPLORATION DRILLING

We use the successful efforts method to account for our oil and gas exploration and production activities. Under this method, exploration costs are capitalized pending an evaluation as to whether sufficient quantities of reserves have been found to justify commercial production. Accounting rules require that this evaluation be made within at least one year of well completion. If our evaluation determines that the well did not encounter sufficient quantities of reserves to justify commercial production, the well costs are expensed as a dry hole and are reported in exploration expense. Exploratory wells that are judged to have discovered potentially sufficient quantities of oil and gas in areas where major capital expenditures are required before the commencement of production and where commercial viability requires the drilling of additional exploratory wells, remain capitalized as long as the drilling of additional exploratory wells is under way or firmly planned for the near future. For offshore deep-water exploratory discoveries, it is not unusual to have exploratory wells capitalized on our balance sheet for a number of years while we perform additional appraisal drilling and seismic work on the potential oil and gas field. We continually monitor the results of the additional appraisal work and expense capitalized well costs as dry holes if we determine that the potential field does not warrant further exploratory efforts in the near term.

We currently have an interest in an exploration block, offshore Nigeria where capitalized exploratory costs have been on our balance sheet for longer than one year. Major capital expenditures are required before production can begin and additional drilling efforts are underway to fully appraise the block. We are preparing a field development plan for the block with our partners for submission to the Nigerian government for approval. Once we obtain this approval and the project has been sanctioned, we will book proved reserves. Capitalized costs relating to this exploration block as at December 31, 2004 were $77 million (2003 - $68 million). In the event that we are unable to book proved reserves for this project, amounts capitalized will be written off.

For more information with respect to amounts and geographic locations of costs incurred on exploration activity and amounts on our balance sheet relating to unproved properties, please refer to our Capitalized Costs and Costs Incurred tables set out in our supplemental Oil and Gas Producing Activities disclosures.

(1) "Proved" oil and gas reserves are the estimated quantities of natural gas, crude oil, condensate and natural gas liquids that geological and engineering data demonstrate with reasonable certainty can be recoverable in future years from known reservoirs under existing economic and operating conditions. Reservoirs are considered "proved" if economic producibility is supported by either actual production or a conclusive formation test. "Proved developed" oil and gas reserves are reserves that can be expected to be recovered through existing wells with existing equipment and operation methods.

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OIL AND GAS ACCOUNTING - IMPAIRMENT

We evaluate our oil and gas properties for impairment if an adverse event or change occurs. Among other things, this might include falling oil and gas prices, a significant revision to our reserve estimates, changes in operating costs, or significant or adverse political changes. If one of these occurs, we estimate undiscounted future cash flows for affected properties to determine if they are impaired. If the undiscounted future cash flows for a property are less than the carrying amount of that property, we calculate its fair value using a discounted cash flow approach. The property is then written down to its fair value.

We assessed our oil and gas properties for impairment at the end of 2004 and found no impairments were required based on our assumptions.

Our cash flow estimates for purposes of our impairment assessments require assumptions about two primary elements - future prices and reserves.

Our estimates of future prices require significant judgements about highly uncertain future events. Historically, oil and gas prices have exhibited significant volatility - over the last five years, prices for WTI and NYMEX gas have ranged from US$17/bbl to US$56/bbl and US$2/mmbtu to US$19/mmbtu, respectively. Our forecasts for oil and gas revenues are based on prices derived from a consensus of future price forecasts amongst industry analysts and our own assessments. Our estimates of future cash flows generally assume our long-term price forecast and forecast operating and development costs. Given the significant assumptions required and the possibility that actual conditions will differ, we consider the assessment of impairment to be a critical accounting estimate. A change in this estimate would impact all except our chemicals business.

If forecast WTI crude oil prices were to fall to mid-US$20 levels our initial assessment of impairment indicators would not change. Although oil and gas prices fluctuate a great deal in the short-term, they are typically stable over a longer-time horizon. This mitigates the potential for impairment.

Any impairment charges would lower our net income.

It is difficult to determine and assess the impact of a decrease in our proved reserves on our impairment tests. The relationship between the reserve estimate and the estimated undiscounted cash flows, and the nature of the property-by-property impairment test, is complex. As a result, we are unable to provide a reasonable sensitivity analysis of the impact that a reserve estimate decrease would have on our assessment of impairment.

BUSINESS COMBINATION - PURCHASE PRICE ALLOCATION

During the fourth quarter of 2004, we acquired EnCana (UK) Limited, a company operating and exploring oil and gas properties located in the North Sea. We accounted for this acquisition using the purchase method of accounting. Under this method, we are required to record on our consolidated balance sheet the estimated fair values of the acquired company's assets and liabilities at the acquisition date. Any excess of the purchase price over the fair values of the tangible and intangible net assets acquired is recorded as goodwill.

We have made various assumptions in determining the fair values of the acquired company's assets and liabilities. The most significant assumptions and judgments made relate to the estimation of the fair value of the oil and gas properties. To determine the fair value of these properties, we estimated (a) oil and gas reserves in accordance with our reserve standards, and (b) future prices of oil and gas.

Our reserve estimates were based on the work performed by our engineers and outside consultants. The judgments associated with these estimated reserves are described earlier in our critical accounting estimates discussion entitled "Oil and Gas Accounting - Reserves Determination". Our estimates of future prices were based on prices derived from a consensus of future price forecasts amongst industry analysts and our own assessments. The judgments associated with these estimates are described earlier in our critical accounting estimates discussion entitled "Oil and Gas Accounting - Impairment".

We applied our estimated future prices to the estimated reserves quantities acquired, and we estimated future operating and development costs, to arrive at estimated future net revenues for the properties acquired. For proved properties, we discounted the future net revenues using after-tax discount rates. The same principles were applied in arriving at the fair value of unproved properties acquired. These unproved properties generally represent the value of the probable and possible reserves. Because of their very nature, probable and possible reserve estimates are more imprecise than those of proved reserves. To compensate for the inherent risk of estimating and valuing unproved reserves, an appropriate risk-weighting factor was applied to the discounted future net revenues of the probable and possible reserves in each particular instance.

If the fair value allocated to oil and gas properties acquired had been decreased by $50 million, future income tax liabilities would have decreased by $20 million and goodwill would have increased by $30 million.

ASSET RETIREMENT OBLIGATIONS

We are required to remove or remedy the effect of our activities on the environment at our present and former operating sites by dismantling and removing production facilities and remediating any damage caused. Estimating our future asset retirement obligations requires us to make estimates and judgments with respect to activities that will occur many years into the future. In addition, the ultimate financial impact of environmental laws and regulations is not always clearly known and cannot be reasonably estimated as standards evolve in the countries in which we operate.

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We record asset retirement obligations in our consolidated financial statements by discounting the present value of the estimated retirement obligations associated with our oil and gas wells and facilities and chemical plants. In arriving at amounts recorded, numerous assumptions and judgments are made with respect to ultimate settlement amounts, inflation factors, credit adjusted discount rates, timing of settlement and expected changes in legal, regulatory, environmental and political environments. The asset retirement obligations we have recorded result in an increase to the carrying cost of our property, plant and equipment. The obligations are accreted with the passage of time. A change in any one of our assumptions could impact our asset retirement obligations, our property, plant and equipment and our net income.

It is difficult to determine the impact of a change in any one of our assumptions. As a result, we are unable to provide a reasonable sensitivity analysis of the impact a change in our assumptions would have on our financial results. We are confident, however, that our assumptions are reasonable.

NEW ACCOUNTING PRONOUNCEMENTS

CANADIAN PRONOUNCEMENTS
In an effort to harmonize Canadian GAAP with US GAAP, the Canadian Accounting Standards Board has issued sections:

o 1530, COMPREHENSIVE INCOME;

o 3855, FINANCIAL INSTRUMENTS -- RECOGNITION AND MEASUREMENT; and

o 3865, HEDGES.

Under these new standards, all financial assets should be measured at fair value with the exception of loans, receivables and investments that are intended to be held to maturity and certain equity investments, which should be measured at cost. Similarly, all financial liabilities should be measured at fair value when they are held for trading or they are derivatives.

Gains and losses on financial instruments measured at fair value will be recognized in the income statement in the periods they arise with the exception of gains and losses arising from:

o financial assets held for sale, for which unrealized gains and losses are deferred in other comprehensive income until sold or impaired; and

o certain financial instruments that qualify for hedge accounting.

Sections 3855 and 3865 make use of "other comprehensive income". Other comprehensive income comprises revenues, expenses, gains and losses that are recognized in comprehensive income, but are excluded from net income. Unrealized gains and losses on qualifying hedging instruments, translation of self-sustaining foreign operations, and unrealized gains or losses on financial instruments held for sale will be included in other comprehensive income and reclassified to net income when realized. Comprehensive income and its components will be a required disclosure under the new standard.

These new standards are effective for fiscal years beginning on or after October 1, 2006 and early adoption is permitted. Adoption of these standards as at December 31, 2004 would have the following impact on our Consolidated Financial Statements:

(Cdn$ millions)                                                  Increase
--------------------------------------------------------------------------
Accounts Receivable                                                     6
Future Income Tax Liabilities                                           2
Shareholders' Equity                                                    4
                                                                ----------

US PRONOUNCEMENTS

In November 2004, the Financial Accounting Standards Board (FASB) issued Statement 151, INVENTORY COSTS. This statement amends ARB 43 to clarify that:

o abnormal amounts of idle facility expense, freight, handling costs and wasted material (spoilage) should be recognized as current-period charges; and

o requires the allocation of fixed production overhead to inventory based on the normal capacity of the production facilities.

The provisions of this statement are effective for inventory costs incurred during fiscal years beginning after June 15, 2005. We do not expect the adoption of this statement will have any material impact on our results of operations or financial position.

In December 2004, the FASB issued Statement 123(R), SHARE-BASED PAYMENTS. This statement revises Statement 123, ACCOUNTING FOR STOCK-BASED COMPENSATION, and supersedes APB Opinion 25, ACCOUNTING FOR STOCK ISSUED TO EMPLOYEES.

Statement 123(R) requires all stock-based awards issued to employees to be measured at fair value and to be expensed in the income statement. This statement is effective for reporting periods beginning after June 15, 2005.

We are currently expensing stock-based awards issued to employees using the fair value method for equity based awards and the intrinsic method for liability based awards. Adoption of this standard will change our expense under US GAAP for tandem options and stock appreciation rights as these awards will be measured using the fair value method rather than the intrinsic method. We are currently evaluating the provisions of Statement 123(R) and have not yet determined the full impact this statement will have on our results of operations or financial position under US GAAP.

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In December 2004, the FASB issued Statement 152, ACCOUNTING FOR REAL ESTATE. This statement amends Statement 66, ACCOUNTING FOR SALES OF REAL ESTATE, to reference the financial accounting and reporting guidance for real estate time-sharing transactions that is provided in AICPA Statement of Position 04-2, ACCOUNTING FOR REAL ESTATE TIME-SHARING TRANSACTIONS. This statement also amends FASB Statement 67, ACCOUNTING FOR COSTS AND INITIAL RENTAL OPERATIONS OF REAL ESTATE PROJECTS, to state that the guidance for incidental operations and costs incurred to sell real estate projects does not apply to real estate time-sharing transactions. This statement is effective for financial statements with fiscal years beginning after June 15, 2005 and will not impact our results of operations or financial position.

In December 2004, the FASB issued Statement 153, EXCHANGES OF NONMONETARY ASSETS, an amendment of APB Opinion 29, ACCOUNTING FOR NONMONETARY TRANSACTIONS. This amendment eliminates the exception for nonmonetary exchanges of similar productive assets and replaces it with a general exception for exchanges of nonmonetary assets that do not have commercial substance. Under Statement 153, if a nonmonetary exchange of similar productive assets meets a commercial-substance test and fair value is determinable, the transaction must be accounted for at fair value resulting in the recognition of any gain or loss. This statement is effective for nonmonetary transactions in fiscal periods that begin after June 15, 2005. We do not expect the adoption of this statement will have any material impact on our results of operations or financial position.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are exposed to normal market risks inherent in the oil and gas and chemicals business, including commodity price risk, foreign-currency rate risk, interest rate risk and credit risk. We recognize these risks and manage our operations to minimize our exposures to the extent practical.

NON-TRADING

COMMODITY PRICE RISK

Commodity price risk related to conventional and synthetic crude oil prices is our most significant market risk exposure. Crude oil prices and quality differentials are influenced by worldwide factors such as OPEC actions, political events and supply and demand fundamentals.

To a lesser extent we are also exposed to natural gas price movements. Natural gas prices are generally influenced by oil prices and North American supply and demand, and to a lesser extent local market conditions.

In 2004, WTI averaged US$41.40/bbl reaching a high of US$56.42/bbl and a low of US$32.41/bbl. NYMEX natural gas prices averaged US$6.19/mcf in 2004, reaching a high of US$8.12/mcf and a low of US$4.34/mcf.

Our sensitivities to commodity prices and the expected impact on our 2005 cash flow from operating activities and net income are as follows:

(Cdn$ millions)                                         Cash Flow   Net Income
-------------------------------------------------------------------------------
WTI - US$1 change above US$43.17                               50           35
WTI - US$1 change below US$43.17                               25           17
NYMEX natural gas - US$0.10 change                             10            7
                                                        -----------------------

These sensitivities to changes in benchmark prices for crude oil and natural gas are based on our estimated 2005 production levels for crude oil and natural gas and assume a Canadian/US dollar exchange rate of 80(cent). Our estimated crude oil and natural gas production range for 2005 is between 230,000 and 250,000 boe/d, of which natural gas represents approximately 20%.

The majority of our oil and gas production is sold under short-term contracts, exposing us to short-term price movements. Other energy contracts we enter into also expose us to commodity price risk between the time we purchase and sell contracted volumes. From time to time, we actively manage these risks by using commodity futures, forwards, swaps and options.

In 2004, we purchased WTI put options to manage the commodity price risk exposure on a portion of our oil production in 2005 and 2006. These options establish an annual average WTI floor price of US$43/bbl in 2005 and US$38/bbl in 2006, as follows:

                                       Notional                    Average Price
                                        Volumes         Term               (WTI)
--------------------------------------------------------------------------------
                                                                       (US$/bbl)
Crude Oil WTI Put Options          60,000 bbls/d        2005                  43
                                   60,000 bbls/d        2006                  38
                                   ---------------------------------------------

In 2003, we entered into WTI and NYMEX gas forward contracts for a 12 month period. These forward contracts fixed our oil and gas prices at contract prices for the hedged volumes, less applicable price differentials, as follows:

                                 Hedged                                  Average
                                Volumes                      Term          Price
--------------------------------------------------------------------------------
                                                                           (US$)
Fixed WTI Price            5,000 bbls/d   April 2003 - March 2004      28.50/bbl
Fixed NYMEX Price        12,000 mmbtu/d   April 2003 - March 2004     5.35/mmbtu
                         -------------------------------------------------------

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Since actual prices during the contract period were higher than the fixed prices we received, our return was lower than what it would have been without these contracts in place. These contracts expired in March 2004.

FOREIGN CURRENCY RISK

A substantial portion of our operations are denominated in or referenced to US dollars including:

o sales of crude oil, natural gas and certain chemicals products;

o capital spending and expenses for our oil and gas and chemicals operations; and

o short-term and long-term borrowings.

The Canadian/US dollar exchange rate averaged 77(cent) in 2004 with a high of 85(cent) and a low of 72(cent).

Our sensitivities to the US dollar and the expected impact of a one cent change on our 2005 cash flow from operating activities, net income, capital expenditures and long-term debt are as follows:

                                                   Cash      Net       Capital   Long-Term
(Cdn$ millions)                                    Flow   Income  Expenditures        Debt
-------------------------------------------------------------------------------------------
   $0.01 change in US to Canadian dollar             25       13            18          50
                                                   ----------------------------------------

Our sensitivities to changes in the Canadian/US dollar exchange rate are calculated based on projected revenues, expenses, capital expenditures and US-dollar denominated long-term debt for 2005. These estimates are based on a WTI price for crude oil of US$40.00/bbl, a NYMEX natural gas price of US$6.50/mcf and a Canadian/US dollar exchange rate of 80 (cent).

We manage our exposure to fluctuations between the US and Canadian dollar by matching our expected net cash flows and borrowings in the same currency. Net revenue from our foreign operations and our US-dollar borrowings are generally used to fund US-dollar capital expenditures and debt repayments. Since the timing of cash inflows and outflows is not necessarily interrelated, particularly for capital expenditures, we maintain revolving Canadian and US-dollar borrowing facilities that can be used or repaid depending on expected net cash flows. We designate our US-dollar borrowings as a hedge against our US-dollar net investment in foreign operations.

Our Buzzard project in the North Sea creates foreign currency exposure as a portion of the capital costs are denominated in British pounds (GBP) and Euros. In order to reduce our exposure to fluctuations in these currencies relative to the US dollar, we purchased foreign currency call options in early-2005. These options set a ceiling on most of our British pound and Euro spending exposure from February 2005 through to the end of 2006.

These call options effectively set a maximum GBP-US$ exchange rate of 1.95 on a total of GBP 84 million for the period March 2005 through June 2005, and a maximum rate of 2.00 on a total of GBP 185 million for the period July 2005 through December 2006. With respect to our Euro exposure, the call options effectively set a maximum Euro-US$ exchange rate of 1.40 on a total of Euros 59 million for the period February through September 2005. Managing our exchange rate exposure through the use of call options caps our exposure if the US dollar weakens relative to the British pound and the Euro but allows us to benefit fully from any strengthening of the US dollar relative to these currencies.

We do not have any material exposure to highly inflationary foreign currencies.

We occasionally use derivative instruments to effectively convert cash flows from Canadian to US dollars and vice versa. At December 31, 2004, we held a foreign currency derivative instrument that obligates us and the counterparty to exchange principal and interest amounts. In November 2006, we will pay US$37 million and receive Cdn $50 million.

INTEREST RISK

We are exposed to fluctuations in short-term interest rates from our floating-rate debt and, to a lesser extent, our derivative instruments and long-term debt, as their market value is sensitive to interest rate fluctuations. To minimize our exposure to interest rate fluctuations, we occasionally use derivative instruments.

Short-term interest rates for US dollar borrowings averaged 3.1% in 2004, reaching a high of 3.2% and low of 3.0%.

Our sensitivity to interest rates and the expected impact of a 1% change in interest rates on our 2005 cash flow from operating activities and net income is as follows:

(Cdn$ millions)                                         Cash Flow    Net Income
--------------------------------------------------------------------------------
Interest Rates - 1% change in rates                             12            8
                                                        ------------------------

Our sensitivity to changes in interest rates is based on 2005 estimated average floating rate debt of $1.2 billion and a Canadian/US dollar exchange rate of
80 (cent).

Our floating rate debt exposes us to changes in interest payments as interest rates fluctuate. To manage this exposure, we maintain a combination of fixed and floating rate borrowings and facilities. At December 31, 2004 fixed-rate borrowings comprised 56% (2003 - 100%) of our long-term debt at an effective average rate of 6.6% (2003 - 8.2%). During the year we periodically drew on our unsecured syndicated term credit facilities and at December 31, 2004, floating rate debt comprised 44% (2003 - nil) of our long-term debt at an effective average rate of 3.2% (2003 - 2.0%).

We had no interest rate swaps outstanding in 2004 or 2003.

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TRADING

COMMODITY PRICE RISK
Our marketing operation is involved in the marketing and trading of crude oil, natural gas and power, through the use of both physical and financial contracts (energy trading activities). These activities expose us to commodity price risk. Open positions exist where not all contracted purchases and sales have been matched. These net open positions allow us to generate income, but also expose us to risk of loss due to fluctuating market prices (market risk). We control the level of market risk through daily monitoring of our energy-trading portfolio relative to:

o prescribed limits for Value-at-Risk (VaR);

o nominal size of commodity positions;

o stop loss limits; and

o stress testing.

VaR is a statistical estimate that is reliable when normal market conditions prevail. Our VaR calculation estimates the maximum probable loss given a 95% confidence level that we would incur if we were to unwind our outstanding positions over a two-day period. We estimate VaR using the Variance-Covariance method based on historical commodity price volatility and correlation inputs. Our estimate is based upon the following key assumptions:

o changes in commodity prices are normally distributed;

o price volatility remains stable; and

o price correlation relationships remain stable.

If a severe market shock occurred, the key assumptions underlying our VaR estimate could be exceeded and the potential loss could be greater than our estimate. There were no changes in the methodology we used to estimate VaR in 2004.

Stress testing complements our VaR estimate. It is used to ensure that we are not exposed to large losses, not captured by VaR, which might result from infrequent but extreme market conditions.

Our year-end, annual high, annual low and annual average VaR amounts are as follows:

(Cdn$ millions)                                   2004        2003          2002
--------------------------------------------------------------------------------
Value at Risk
   Year-End                                         21          21           19
   High                                             42          31           28
   Low                                              17          14           12
   Average                                          29          20           17
                                                  ------------------------------

Our Board of Directors has approved formal risk management policies for our energy trading activities. Market and credit risks are monitored daily by a risk group that operates independently and ensures compliance with our risk management policies. The Finance Committee of the Board of Directors and our Risk Management Committee monitor our exposure to the above risks and review the results of our energy trading activities regularly.

CREDIT RISK

Credit risk affects both our trading and non-trading activities and is the risk of loss if counterparties do not fulfill their contractual obligations. Most of our receivables are with counterparties in the oil and gas and energy trading industry and are subject to normal industry credit risk. We take the following measures to reduce this risk:

o we assess the financial strength of our counterparties through a rigorous credit process;

o we limit the total exposure extended to individual counterparties, and may require collateral from some counterparties;

o we routinely monitor credit risk exposures, including sector, geographic and corporate concentrations of credit, and report these to our Risk Management Committee and the Finance Committee of the Board;

o we set credit limits based on rating agency credit ratings and internal assessments based on company and industry analysis;

o we review counterparty credit limits regularly; and

o we use standard agreements that allow for the netting of exposures associated with a single counterparty.

We believe these measures minimize our overall credit risk. However, there can be no assurance that these processes will protect us against all losses from non-performance. At December 31, 2004:

o over 90% of our receivables were investment grade;

o only two counterparties individually made up more than 5% of our credit exposure. All were investment grade.

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

Certain statements in this report, including those appearing in ITEMS 1 AND 2 - BUSINESS AND PROPERTIES and ITEM 7 - MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS, are forward-looking statements(1). Forward-looking statements are generally identifiable by terms such as ANTICIPATE, BELIEVE, INTEND, PLAN, EXPECT, ESTIMATE, BUDGET, OUTLOOK or other similar words, and include statements relating to future production associated with our Long Lake, North Sea and West Africa projects.

These statements are subject to known and unknown risks and uncertainties and other factors which may cause actual results, levels of activity and achievements to differ materially from those expressed or implied by such statements. These risks, uncertainties and other factors include:

o market prices for oil, natural gas and chemicals products;

o our ability to produce and transport crude oil and natural gas to markets;

o the results of exploration and development drilling and related activities;

o foreign-currency exchange rates;

o economic conditions in the countries and regions in which we carry on business;

o governmental actions that increase taxes, change environmental and other laws and regulations;

o renegotiations of contracts; and

o political uncertainty, including actions by terrorists, insurgent or other groups or armed other conflict, including conflict between states.

The above items and their possible impact are discussed more fully in the section, titled BUSINESS RISK MANAGEMENT in Item 7 and QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK in Item 7A.

The impact of any one risk, uncertainty or factor on a particular forward-looking statement is not determinable with certainty as these are interdependent and management's future course of action depends upon our assessment of all information available at that time. Any statements regarding the following are forward-looking statements:

o future crude oil, natural gas or chemicals prices;

o future production levels;

o future cost recovery oil revenues from our operations in Yemen;

o future capital expenditures and their allocation to exploration and development activities;

o future asset dispositions;

o future sources of funding for our capital program;

o future debt levels;

o future cash flows and their uses;

o future drilling of new wells;

o ultimate recoverability of reserves;

o expected finding and development costs;

o expected operating costs;

o future demand for chemicals products;

o future expenditures and future allowances relating to environmental matters; and

o dates by which certain areas will be developed or will come on stream.

We believe that any forward-looking statements made are reasonable based on information available to us on the date such statements were made. However, no assurance can be given as to future results, levels of activity and achievements. We undertake no obligation to update publicly or revise any forward-looking statements contained in this report. All subsequent forward-looking statements, whether written or oral, attributable to us or persons acting on our behalf are expressly qualified in their entirety by these cautionary statements.

(1) Within the meaning of the United States PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995, Section 21E of the United States SECURITIES EXCHANGE ACT OF 1934, as amended, and Section 27A of the United States SECURITIES ACT OF 1933, as amended.

71

SPECIAL NOTE TO CANADIAN INVESTORS

Nexen is a US Securities and Exchange Commission (SEC) registrant and a Form 10-K and related forms filer. Therefore, our reserves estimates and securities regulatory disclosures generally follow SEC requirements.

In 2003, Canadian regulatory authorities adopted NATIONAL INSTRUMENT 51-101 - STANDARDS OF DISCLOSURE FOR OIL AND GAS ACTIVITIES (NI 51-101) which prescribe that Canadian companies follow certain standards for the preparation and disclosure of reserves and related information. We have been granted the following exemptions permitting us to:

o substitute our SEC disclosures for much of the annual disclosure required by NI 51-101;

o prepare our reserves estimates and related disclosures in accordance with SEC requirements, generally accepted industry practices in the US as promulgated by the Society of Petroleum Engineers, and the standards of the Canadian Oil and Gas Evaluation Handbook (COGE Handbook) modified to reflect SEC requirements;

o dispense with the requirement to have our reserves estimates and the Standardized Measure of Discounted Future Net Cash Flows and Changes Therein, included in the Supplementary Financial Information, evaluated or audited by independent qualified reserves evaluators; and

o not disclose certain prescribed information pertaining to prospects if such disclosures would result in the contravention of a legal obligation, would likely be detrimental to our competitive interests or the information does not exist.

As a result of these exemptions, Canadian investors should note the following fundamental differences in reserves estimates and related disclosures contained in the Form 10-K:

o SEC registrants apply SEC reserves definitions and prepare their reserves estimates in accordance with SEC requirements and generally accepted industry practices in the US whereas NI 51-101 requires adherence to the definitions and standards promulgated by the COGE Handbook;

o the SEC mandates disclosure of proved reserves and the Standardized Measure of Discounted Future Net Cash Flows and Changes Therein calculated using year-end constant prices and costs only whereas NI 51-101 also requires disclosure of reserves and related future net revenues using forecast prices;

o the SEC mandates disclosure of proved and proved producing reserves by country only whereas NI 51-101 requires disclosure of more reserve categories and product types;

o the SEC does not require separate disclosure of proved undeveloped reserves or related future development costs whereas NI 51-101 requires disclosure of more information regarding proved undeveloped reserves, related development plans and future development costs;

o the SEC does not require disclosure of finding and development (F&D) costs per boe of proved reserves additions whereas NI 51-101 requires that various F&D costs per boe be disclosed. NI 51-101 requires that F&D costs be calculated by dividing the aggregate of exploration and development costs incurred in the current year and the change in estimated future development costs relating to proved reserves by the additions to proved reserves in the current year. However, this will generally not reflect full cycle finding and development costs related to reserve additions for the year;

o the SEC leaves the engagement of independent qualified reserves evaluators to the discretion of a company's board of directors whereas NI 51-101 requires issuers to engage such evaluators and to file their reports;

o the SEC does not consider the upgrading component of our integrated oil sands project at Long Lake as an oil and gas activity, and therefore permits recognition of bitumen reserves only. NI 51-101 specifically includes such activity as an oil and gas activity and recognizes synthetic oil as a product type, and therefore permits recognition of synthetic reserves. Given low year-end bitumen prices, we have not recognized any proved bitumen reserves under SEC requirements whereas under NI 51-101 we would have recognized 205 million barrels of proved synthetic reserves (before royalties); and

o the SEC considers our Syncrude operation as a mining activity rather than an oil and gas activity, and therefore does not permit related reserves to be included with oil and gas reserves. NI 51-101 specifically includes such activity as an oil and gas activity and recognizes synthetic oil as a product type, and therefore permits them to be included with oil and gas reserves. We have provided a separate table showing our share of the Syncrude proved reserves as well as the additional disclosures relating to mining activities required by SEC requirements.

The foregoing is a general description of the principal differences only.

NI 51-101 requires that we make the following disclosures:

o we use oil equivalents (boes) to express quantities of natural gas and crude oil in a common unit. A conversion ratio of 6 mcf of natural gas to 1 barrel of oil is used. Boes may be misleading, particularly if used in isolation. The conversion ratio is based on an energy equivalency conversion method primarily applicable at the burner tip and does not represent a value equivalency at the wellhead.

72

FINANCIAL STATEMENTS

[GRAPHIC OMITTED]
[GRAPHIC IMAGE: GULF OF MEXICO, US]

73

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY FINANCIAL INFORMATION

TABLE OF CONTENTS

REPORT OF MANAGEMENT..........................................................75

REPORT OF INDEPENDENT REGISTERED CHARTERED ACCOUNTANTS........................76

CONSOLIDATED FINANCIAL STATEMENTS

     Consolidated Statement of Income.........................................77
     Consolidated Balance Sheet ..............................................78
     Consolidated Statement of Cash Flows ....................................79
     Consolidated Statement of Shareholders' Equity ..........................80
     Notes to Consolidated Financial Statements ..............................81

SUPPLEMENTARY FINANCIAL INFORMATION (UNAUDITED)

Quarterly Financial Data in Accordance with Canadian and US GAAP........113 Oil and Gas Producing Activities and Syncrude Operations ...............114

74

REPORT OF MANAGEMENT

February 7, 2005

To the Shareholders of Nexen Inc.:

We are responsible for the preparation and fair presentation of the consolidated financial statements, as well as the financial reporting process that gives rise to such consolidated financial statements. This responsibility requires us to make significant accounting judgments and estimates. For example, we are required to choose accounting principles and methods that are appropriate to the company's circumstances and we are required to make estimates and assumptions that affect amounts reported. Fulfilling this responsibility requires the preparation and presentation of our consolidated financial statements in accordance with generally accepted accounting principles in Canada with a reconciliation to generally accepted accounting principles in the US.

We also have responsibility for the preparation and fair presentation of other financial information in this report and to ensure the consistency of this information with the financial statements.

We are responsible for the development and implementation of internal controls over the financial reporting process. These controls are designed to provide reasonable assurance that relevant and reliable financial information is produced. To gather and control financial data, we have established accounting and reporting systems supported by internal controls over financial reporting and an internal audit program. We believe that our internal controls over financial reporting provide reasonable assurance that our assets are safeguarded against loss from unauthorized use or disposition, that receipts and expenditures of the company are made only in accordance with authorization of management and directors of the company, and that our records are reliable for preparing our consolidated financial statements and other financial information in accordance with applicable generally accepted accounting principles and in accordance with applicable securities rules and regulations. All internal control systems, no matter how well designed, have inherent limitations. Therefore, even those systems determined to be effective can provide only reasonable assurance with respect to financial statement preparation and presentation.

We have established disclosure controls and procedures, internal controls over financial reporting and corporate-wide policies to ensure that Nexen's consolidated financial position, results of operations and cash flows are presented fairly. Our disclosure controls and procedures are designed to ensure timely disclosure and communication of all material information required by regulators. We oversee, with assistance from our Disclosure Review Committee, these controls and procedures and all required regulatory disclosures.

To ensure the integrity of our financial statements, we carefully select and train qualified personnel. We also ensure our organizational structure provides appropriate delegation of authority and division of responsibilities. Our policies and procedures are communicated throughout the organization and include a written ethics and integrity policy that applies to all employees including the chief executive officer, chief financial officer and chief accounting officer or controller.

Our Board of Directors is responsible for reviewing and approving the consolidated financial statements and for overseeing management's performance of its financial reporting responsibilities. Their financial statement related responsibilities are fulfilled mainly through the Audit and Conduct Review Committee (the Audit Committee) with assistance from the Reserves Review Committee regarding the annual review of our crude oil and natural gas reserves and the Finance Committee regarding the assessment and mitigation of risk. The Audit Committee is composed entirely of independent directors, and includes four directors with financial expertise. The Audit Committee meets regularly with management, the internal auditors, and the independent auditors, to review accounting policies, financial reporting and internal control issues and to ensure each party is properly discharging its responsibilities. The Audit Committee is responsible for the appointment and compensation of the independent auditors and also considers their independence, reviews their fees and (subject to applicable securities laws), pre-approves their retention for any permitted non-audit services and their fee for such services. The internal auditors and independent registered Chartered Accountants have full and unlimited access to the Audit Committee, with or without the presence of management.

(signed) "Charles W. Fischer"                (signed) "Marvin F. Romanow"
President and Chief Executive Officer        Executive Vice President
                                             and Chief Financial Officer

75

REPORT OF INDEPENDENT REGISTERED CHARTERED ACCOUNTANTS

To the Board of Directors and Shareholders of Nexen Inc.:

We have audited the consolidated balance sheet of Nexen Inc. as at December 31, 2004 and 2003 and the consolidated statements of income, cash flows and shareholders' equity for each of the years in the three year period ended December 31, 2004. These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with Canadian generally accepted auditing standards and the standards of the Public Company Accounting Oversight Board (United States). These standards require that we plan and perform an audit to obtain reasonable assurance whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, these consolidated financial statements present fairly, in all material respects, the financial position of the Company as at December 31, 2004 and 2003 and the results of its operations and its cash flows for each of the years in the three year period ended December 31, 2004 in accordance with Canadian generally accepted accounting principles.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the effectiveness of the Company's internal control over financial reporting as at December 31, 2004, based on the criteria established in INTERNAL CONTROL - INTEGRATED FRAMEWORK issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 7, 2005 expressed an unqualified opinion on management's assessment of the effectiveness of the Company's internal control over financial reporting and an unqualified opinion on the effectiveness of the Company's internal control over financial reporting.

Calgary, Canada                                 (signed) "Deloitte & Touche LLP"
February 7, 2005                                Independent Registered
                                                Chartered Accountants

COMMENTS BY AUDITORS ON CANADA-UNITED STATES OF AMERICA REPORTING DIFFERENCE

The standards of the Public Company Accounting Oversight Board (United States) require the addition of an explanatory paragraph (following the opinion paragraph) when there are changes in accounting principles that have a material effect on the comparability of the Company's financial statements, such as the changes described in Note 1(r) to the consolidated financial statements. Our report to the board of directors and shareholders on the consolidated financial statements of Nexen Inc., dated February 7, 2005, is expressed in accordance with Canadian reporting standards which do not require a reference to such changes in accounting principles in the auditors' report when the change is properly accounted for and adequately disclosed in the financial statements.

Calgary, Canada                                 (signed) "Deloitte & Touche LLP"
February 7, 2005                                Independent Registered
                                                Chartered Accountants

76

NEXEN INC.
CONSOLIDATED STATEMENT OF INCOME
FOR THE THREE YEARS ENDED DECEMBER 31, 2004
Cdn$ millions, except per share amounts

                                                                     2004             2003             2002
------------------------------------------------------------------------------------------------------------
                                                                              Restated for     Restated for
                                                                                Changes in       Changes in
                                                                                Accounting       Accounting
                                                                                Principles       Principles
                                                                                  Note 1(r)        Note 1(r)
REVENUES
    Net Sales                                                       3,176            2,844            2,341
    Marketing and Other (Note 14)                                     729              610              496
                                                                    ----------------------------------------
                                                                    3,905            3,454            2,837
                                                                    ----------------------------------------
EXPENSES
    Operating                                                         762              721              701
    Depreciation, Depletion, Amortization and Impairment (Note 5)     744              995              632
    Transportation and Other                                          564              489              475
    General and Administrative                                        299              190              151
    Exploration                                                       246              199              178
    Interest (Note 7)                                                 143              169              181
                                                                    ----------------------------------------
                                                                    2,758            2,763            2,318
                                                                    ----------------------------------------

INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES               1,147              691              519
                                                                    ----------------------------------------

PROVISION FOR INCOME TAXES (Note 15)
    Current                                                           248              214              207
    Future                                                            119              (73)             (44)
                                                                    ----------------------------------------
                                                                      367              141              163
                                                                    ----------------------------------------

NET INCOME FROM CONTINUING OPERATIONS                                 780              550              356
    Net Income from Discontinued Operations (Note 11)                  13               28               53
                                                                    ----------------------------------------

NET INCOME                                                            793              578              409
                                                                    ========================================

EARNINGS PER COMMON SHARE FROM CONTINUING OPERATIONS ($/share)
    Basic (Note 10)                                                  6.07             4.45              2.91
                                                                    ========================================

    Diluted (Note 10)                                                5.99             4.41              2.87
                                                                    ========================================

EARNINGS PER COMMON SHARE ($/share)
    Basic (Note 10)                                                  6.17             4.67              3.34
                                                                    ========================================

    Diluted (Note 10)                                                6.09             4.63              3.30
                                                                    ========================================

SEE ACCOMPANYING NOTES TO CONSOLIDATED FINANCIAL STATEMENTS.

77

NEXEN INC.
CONSOLIDATED BALANCE SHEET
DECEMBER 31, 2004 AND 2003
Cdn$ millions, except share amounts

                                                                        2004              2003
-----------------------------------------------------------------------------------------------
                                                                                  Restated for
                                                                                    Changes in
                                                                                    Accounting
                                                                                    Principles
                                                                                     Note 1(r)
ASSETS
    CURRENT ASSETS
      Cash and Cash Equivalents                                           74             1,087
      Accounts Receivable (Note 3)                                     2,136             1,423
      Inventories and Supplies (Note 4)                                  351               270
      Other                                                               42                79
                                                                     --------------------------
          Total Current Assets                                         2,603             2,859
                                                                     --------------------------

    PROPERTY, PLANT AND EQUIPMENT (Note 5)                             8,643             4,550
    GOODWILL                                                             375                36
    FUTURE INCOME TAX ASSETS (Note 15)                                   333               108
    DEFERRED CHARGES AND OTHER ASSETS (Note 17)                          429               164
                                                                     --------------------------

                                                                      12,383             7,717
                                                                     ==========================
LIABILITIES AND SHAREHOLDERS' EQUITY
    CURRENT LIABILITIES
      Short-Term Borrowings (Note 7)                                     100                --
      Current Portion of Long-Term Debt (Note 7)                          --               572
      Accounts Payable and Accrued Liabilities                         2,416             1,404
      Accrued Interest Payable                                            34                44
      Dividends Payable                                                   13                12
                                                                     --------------------------
          Total Current Liabilities                                    2,563             2,032
                                                                     --------------------------

    LONG-TERM DEBT (Note 7)                                            4,259             2,517
    FUTURE INCOME TAX LIABILITIES (Note 15)                            2,131               720
    ASSET RETIREMENT OBLIGATIONS (Note 8)                                421               305
    DEFERRED CREDITS AND OTHER LIABILITIES                               142                68
    SHAREHOLDERS' EQUITY (Note 9)
      Common Shares, no par value
        Authorized:        Unlimited
        Outstanding:       2004 - 129,199,583 shares
                           2003 - 125,606,107 shares                     637               513
      Contributed Surplus                                                 --                 1
      Retained Earnings                                                2,335             1,594
      Cumulative Foreign Currency Translation Adjustment                (105)              (33)
                                                                     --------------------------
          Total Shareholders' Equity                                   2,867             2,075
                                                                     --------------------------

    COMMITMENTS, CONTINGENCIES AND GUARANTEES (Notes 12 and 15)
                                                                      12,383             7,717
                                                                     ==========================

SEE ACCOMPANYING NOTES TO CONSOLIDATED FINANCIAL STATEMENTS.

Approved on behalf of the Board:

(Signed) "Charles W. Fischer" (Signed) "David A. Hentschel" Director Director

78

NEXEN INC.
CONSOLIDATED STATEMENT OF CASH FLOWS
FOR THE THREE YEARS ENDED DECEMBER 31, 2004
Cdn$ millions

                                                                                   2004               2003                2002
-------------------------------------------------------------------------------------------------------------------------------
                                                                                              Restated for        Restated for
                                                                                                Changes in          Changes in
                                                                                                Accounting          Accounting
                                                                                                Principles          Principles
                                                                                                 Note 1(r)           Note 1(r)
OPERATING ACTIVITIES
    Net Income from Continuing Operations                                           780                550                 356
    Net Income from Discontinued Operations                                          13                 28                  53
    Charges and Credits to Income not Involving Cash (Note 16)                      903              1,018                 724
    Exploration Expense                                                             246                199                 178
    Changes in Non-Cash Working Capital (Note 16)                                  (122)              (320)                (46)
    Other (Note 16)                                                                (213)               (70)                (15)
                                                                               ------------------------------------------------
                                                                                  1,607              1,405               1,250

FINANCING ACTIVITIES
    Proceeds from Long-Term Notes and Debentures (Note 7)                         1,779                651                 790
    Repayment of Long-Term Notes and Debentures (Note 7)                           (300)                --                   -
    Proceeds from (Repayment of) Term Credit Facilities, Net                         83                 93                (419)
    Proceeds from (Repayment of) Short-Term Borrowings, Net                         101                (18)                (33)
    Proceeds from Subordinated Debentures (Note 7)                                   --                613                  --
    Redemption of Preferred Securities (Note 7)                                    (289)              (340)                 --
    Dividends on Common Shares                                                      (52)               (40)                (37)
    Issue of Common Shares                                                          124                 73                  51
    Other                                                                           (20)               (26)                (23)
                                                                               ------------------------------------------------
                                                                                  1,426              1,006                 329

INVESTING ACTIVITIES
    Business Acquisition, Net of Cash Acquired (Note 2)                          (2,583)                --                  --
    Capital Expenditures
      Exploration and Development                                                (1,582)            (1,276)             (1,477)
      Proved Property Acquisitions                                                   (4)              (164)                 (4)
      Chemicals, Corporate and Other                                                (95)               (54)               (144)
    Proceeds on Disposition of Assets                                                34                293                  49
    Changes in Non-Cash Working Capital (Note 16)                                   244                (18)                  7
    Other                                                                           (27)                --                  --
                                                                               ------------------------------------------------
                                                                                 (4,013)            (1,219)             (1,569)


EFFECT OF EXCHANGE RATE CHANGES ON CASH AND
    CASH EQUIVALENTS                                                                (33)              (164)                (12)
                                                                               ------------------------------------------------

INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                                 (1,013)             1,028                  (2)

CASH AND CASH EQUIVALENTS - BEGINNING OF YEAR                                     1,087                 59                  61
                                                                               ------------------------------------------------

CASH AND CASH EQUIVALENTS - END OF YEAR                                              74              1,087                  59
                                                                               ================================================

SEE ACCOMPANYING NOTES TO CONSOLIDATED FINANCIAL STATEMENTS.

79

NEXEN INC.
CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY
FOR THE THREE YEARS ENDED DECEMBER 31, 2004
Cdn$ millions

                                                                                   2004               2003                2002
-------------------------------------------------------------------------------------------------------------------------------
                                                                                              Restated for        Restated for
                                                                                                Changes in          Changes in
                                                                                                Accounting          Accounting
                                                                                                Principles          Principles
                                                                                                 Note 1(r)           Note 1(r)
COMMON SHARES (Note 9)
    Balance at Beginning of Year                                                    513                440                 389
    Exercise of Stock Options                                                        93                 50                  27
    Issue of Common Shares                                                           31                 23                  24
                                                                               ------------------------------------------------
    Balance at End of Year                                                          637                513                 440
                                                                               ------------------------------------------------

CONTRIBUTED SURPLUS
    Balance at Beginning of Year                                                      1                 --                  --
    Stock Based Compensation Expense (Note 9)                                         2                  1                  --
    Modification of Stock Option Plan to Tandem Option Plan (Note 9)                 (3)                --                  --
                                                                               ------------------------------------------------
    Balance at End of Year                                                           --                  1                  --
                                                                               ------------------------------------------------

RETAINED EARNINGS
    Balance at Beginning of Year                                                  1,594              1,056                 697
    Retroactive Adjustment for Changes in Accounting Principles (Note 1)             --                 --                 (13)
    Net Income                                                                      793                578                 409
    Dividends on Common Shares                                                      (52)               (40)                (37)
                                                                               ------------------------------------------------
    Balance at End of Year                                                        2,335              1,594               1,056
                                                                               ------------------------------------------------

CUMULATIVE FOREIGN CURRENCY TRANSLATION ADJUSTMENT
    Balance at Beginning of Year                                                    (33)                94                  94
    Retroactive Adjustment for Changes in Accounting Principles (Note 1)             --                 --                 (34)
    Translation Adjustment, Net of Income Taxes                                     (72)              (127)                 34
                                                                               ------------------------------------------------
    Balance at End of Year                                                         (105)               (33)                 94
                                                                               ------------------------------------------------

SEE ACCOMPANYING NOTES TO CONSOLIDATED FINANCIAL STATEMENTS.

80

NEXEN INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
Cdn$ millions except as noted

1. ACCOUNTING POLICIES

Our Consolidated Financial Statements are prepared in accordance with Canadian Generally Accepted Accounting Principles (GAAP). The impact of significant differences between Canadian and US GAAP on the Consolidated Financial Statements is disclosed in Note 19. We make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the Consolidated Financial Statements, and revenues and expenses during the reporting period. Our management reviews these estimates, including those related to litigation, environmental and dismantlement liabilities, income taxes and determination of proved reserves on an ongoing basis. Changes in facts and circumstances may result in revised estimates and actual results may differ from these estimates.

(a) PRINCIPLES OF CONSOLIDATION

The Consolidated Financial Statements include the accounts of Nexen Inc. and our subsidiary companies (Nexen, we or our). All subsidiary companies are wholly owned and all material intercompany accounts and transactions have been eliminated. We proportionately consolidate our undivided interests in our oil and gas exploration, development and production activities conducted under joint venture arrangements. We also proportionately consolidate our 7.23% undivided interest in the Syncrude joint venture, which is considered a mining activity under US regulations. While the joint ventures under which these activities are carried out do not comprise distinct legal entities, they are operating entities, the significant operating policies of which are, by contractual arrangement, jointly controlled by all working interest parties.

(b) ACCOUNTS RECEIVABLE

Accounts receivable are recorded based on our revenue recognition policy (see Note 1(i)). Our allowance for doubtful accounts provides for specific doubtful receivables.

(c) INVENTORIES AND SUPPLIES

Inventories and supplies for our oil and gas, marketing and chemicals operations are stated at the lower of cost and net realizable value. Cost is determined on the first-in, first-out method or average basis.

Inventory costs include expenditures and other costs, including depreciation, depletion and amortization, directly or indirectly incurred in bringing the inventory to its existing condition.

(d) PROPERTY, PLANT AND EQUIPMENT (PP&E)

Property, plant and equipment is recorded at cost and includes only recoverable costs that directly result in an identifiable future benefit. Unrecoverable costs, maintenance and turnaround costs are expensed as incurred. Improvements that increase capacity or extend the useful lives of the related assets are capitalized to PP&E.

We follow successful efforts accounting for our oil and gas business. All property acquisition costs are initially capitalized to PP&E as unproved property costs. Once proved reserves are discovered, the acquisition costs are reclassified to proved property acquisition costs. Exploration drilling costs are capitalized pending evaluation as to whether sufficient quantities of reserves have been found to justify commercial production. If commercial quantities of reserves are not found, exploration drilling costs are expensed. All exploratory wells are evaluated for commercial viability within twelve months of drilling completion. Exploration wells that discover potentially commercial quantities of reserves in areas requiring major capital expenditures before the commencement of production and where commercial viability requires the drilling of additional exploratory wells, remain capitalized as long as the drilling of additional exploratory wells is under way or firmly planned. All other exploration costs, including geological and geophysical and annual lease rentals are expensed to earnings as incurred. All development costs are capitalized as proved property costs. General and administrative costs that directly relate to acquisition, exploration and development activities are capitalized to PP&E.

Property, plant and equipment for our Syncrude operation is recorded at cost and includes only recoverable costs that directly result in an identifiable future benefit. Unrecoverable costs, maintenance and turnaround costs are expensed as incurred. Improvements that increase capacity or extend the useful lives of the related assets are capitalized to PP&E.

We engage in research and development activities to develop or improve processes and techniques to extract oil and gas. Research involves investigating new knowledge. Development involves translating that knowledge into a new technology or process. Research costs are expensed as incurred. Development costs are deferred once technical feasibility is established and we intend to proceed with development. We defer these costs in PP&E until the commencement of commercial operations or production. Otherwise, development costs are expensed as incurred. Development costs include pre-operating revenues and costs.

81

(e) DEPRECIATION, DEPLETION, AMORTIZATION AND IMPAIRMENT (DD&A)

Under successful efforts accounting, we deplete oil and gas capitalized costs using the unit-of-production method. Development and exploration drilling and equipping costs are depleted over remaining proved developed reserves and proved property acquisition costs over remaining proved reserves. Depletion is considered a cost of inventory when the oil and gas is produced. When this inventory is sold, the depletion is charged to DD&A expense.

Our Syncrude PP&E is depleted using the unit-of-production method. Capitalized costs are depleted over proved and probable reserves within developed areas of interest.

We depreciate other plant and equipment costs, including our chemicals facilities, using the straight-line method based on the estimated useful lives of the assets, which range from 3 years to 30 years. Unproved property costs and major projects that are under construction or development are not depreciated, depleted or amortized.

We evaluate the carrying value of our PP&E whenever events or conditions occur that indicate that the carrying value of properties on our balance sheet may not be recoverable from future cash flows. These events or conditions occur periodically. If carrying value exceeds the sum of undiscounted future cash flows, the property's value is impaired. The property is then assigned a fair value equal to its estimated total future cash flows, discounted for the time value of money, and we expense the excess carrying value to depreciation, depletion, amortization and impairment. Our cash flow estimates require assumptions about future commodity prices, operating costs and other factors. Actual results can differ from those estimates.

In assessing the carrying values of our unproved properties, we take into account our future plans for those properties, the remaining terms of the leases and any other factors that may be indicators of potential impairment.

(f) CARRIED INTEREST

We conduct certain international operations jointly with foreign governments in accordance with production sharing agreements pursuant to which proved reserves are recognized using the economic interest method. Under these agreements, we pay both our share and the government's share of operating and capital costs. We recover the government's share of these costs from future revenues or production over several years. The government's share of operating costs are recorded in operating expense when incurred and capital costs are recorded in PP&E and are expensed to DD&A in the year recovered. All recoveries are recorded as revenue in the year of recovery.

(g) ASSET RETIREMENT OBLIGATIONS

We provide for future asset retirement obligations on our resource properties, facilities, production platforms, pipelines and chemicals facilities based on estimates established by current legislation and industry practices. The asset retirement obligation is initially measured at fair value and capitalized to property, plant and equipment as an asset retirement cost. The asset retirement obligation accretes until the time the retirement obligation is expected to settle while the asset retirement cost is amortized over the useful life of the underlying property, plant and equipment. The amortization of the asset retirement cost and the accretion of the asset retirement obligation are included in depreciation, depletion, amortization and impairment. Actual retirement costs are recorded against the obligation when incurred. Any difference between the recorded asset retirement obligation and the actual retirement costs incurred is recorded as a gain or loss in the period of settlement.

(h) GOODWILL

Goodwill is recorded at cost and is not amortized. We test goodwill for impairment annually based on estimated future cash flows of the reporting unit to which the goodwill is attributable. In addition, we test goodwill for impairment whenever an event or circumstance occurs that may reduce the fair value of a reporting unit below its carrying amount. Our goodwill is attributable to our Marketing and United Kingdom reporting units.

(i) REVENUE RECOGNITION

CRUDE OIL AND NATURAL GAS

Revenue from the production of crude oil and natural gas is recognized when title passes to the customer. In Canada, the United States and the United Kingdom, our customers typically take title when the crude oil and natural gas reaches the end of the pipeline. For our other international operations, our customers take title when the crude oil is loaded onto the tanker. When we produce or sell more or less oil or natural gas than our share, production overlifts and underlifts occur. We record overlifts as liabilities, and underlifts as assets. We settle these over time as liftings are equalized or in cash when production ends.

Revenue represents Nexen's share and is recorded net of royalty payments to governments and other mineral interest owners. For our international operations, all government interests, except for income taxes, are considered royalty payments. Our revenue also includes the recovery of costs paid on behalf of foreign governments in international locations. See Note 1(f).

82

CHEMICALS

Revenue from our chemicals operations is only recognized when our products are delivered to our customers. Delivery only takes place when we have a sales contract in place specifying delivery volumes and sales prices. We assess customer credit worthiness before entering into sales contracts to minimize collection risk.

MARKETING

Substantially all of the physical purchase and sales contracts entered into by our marketing operation are considered to be derivative instruments. Accordingly, financial and physical commodity contracts (collectively derivative instruments) held by our marketing operation are stated at fair value on the balance sheet date unless the requirements for hedge accounting are met (see Note 1(m)). We record any change in fair value as a gain or loss in marketing and other.

Any margin realized by our marketing department on the sale of our proprietary oil and gas production is included in marketing and other. We assess customer credit worthiness before entering into contracts and provide for netting terms to minimize collection risk. Amounts are recorded on a net basis where we have the legal right of offset. Our marketing operation has received cash payments in exchange for assuming certain transportation obligations from third parties. These cash payments have been recorded as deferred liabilities and are recognized in net income as the transportation is used.

(j) INCOME TAXES

We follow the liability method of accounting for income taxes (see Note 15). This method recognizes income tax assets and liabilities at current rates, based on temporary differences in reported amounts for financial statement and tax purposes. The effect of a change in income tax rates on future income tax assets and future income tax liabilities is recognized in income when substantively enacted.

We do not provide for foreign withholding taxes on the undistributed earnings of our foreign subsidiaries, since we intend to invest such earnings indefinitely in foreign operations.

(k) FOREIGN CURRENCY TRANSLATION

Our foreign operations, which are considered financially and operationally independent, are translated from their functional currency into Canadian dollars as follows:

o assets and liabilities using exchange rates at the balance sheet dates; and

o revenues and expenses using the average exchange rates throughout the year.

Gains and losses resulting from this translation are included in the cumulative foreign currency translation adjustment in shareholders' equity.

Monetary balances denominated in a currency other than a functional currency are translated into the functional currency using exchange rates at the balance sheet dates. Gains and losses arising from translation, except on our designated US-dollar debt, are included in income. We have designated US-dollar debt as a hedge against our net investment in US-dollar based self-sustaining foreign operations. Gains and losses resulting from the translation of the designated US-dollar debt are included in the cumulative foreign currency translation adjustment in shareholders' equity. If our US-dollar debt, net of income taxes, exceeds our US-dollar investment in foreign operations, then the gains or losses attributable to such excess are included in marketing and other in the Consolidated Statement of Income.

(l) CAPITALIZED INTEREST

We capitalize interest on major development projects until such time as the project is substantially complete using the weighted-average interest rate on all of our borrowings. Capitalized interest cannot exceed the actual interest expense.

(m) DERIVATIVE INSTRUMENTS

NON-TRADING ACTIVITIES

We use derivative instruments such as physical purchase and sales, forwards, futures, swaps and options for non-trading purposes to manage fluctuations in commodity prices, foreign currency exchange rates and interest rates (see Note
6). We record these instruments at fair value at the balance sheet date and record any change in fair value as a net gain or loss in marketing and other during the period of change unless the requirements for hedge accounting are met. Hedge accounting is used when there is a high degree of correlation between price movements in the derivative instruments and the items designated as being hedged. Nexen formally documents all hedges and the risk management objectives at the inception of the hedge. We recognize gains and losses on the derivative instruments designated as hedges in the same period as the gains or losses on the hedged items are recognized. If effective correlation ceases, hedge accounting is terminated and future changes in the market value of the derivative instrument are included as gains or losses in marketing and other in the period of change.

83

TRADING ACTIVITIES

Our marketing operation uses derivative instruments for marketing and trading crude oil and natural gas including:

o commodity contracts settled with physical delivery;

o exchange-traded futures and options; and

o non-exchange traded forwards, swaps and options.

We record these instruments at fair value at the balance sheet date and record changes in fair value as net gains or losses in marketing and other during the period of change. The fair value of these instruments is recorded as accounts receivable or payable if we anticipate settling the instruments within a year of the balance sheet date. If we anticipate settling the instruments beyond 12 months we record them as deferred charges and other assets or deferred credits and other liabilities.

(n) EMPLOYEE BENEFITS

The cost of pension benefits earned by employees in our defined benefit pension plans is actuarially determined using the projected-benefit method prorated on service and our best estimate of the plans' investment performance, salary escalations and retirement ages of employees. To calculate the plans' expected returns, assets are measured at fair value. Past service costs arising from plan amendments, and net actuarial gains and losses which exceed 10% of the greater of the accrued benefit obligation and the fair value of plan assets, are expensed in equal amounts over the expected average remaining service life of the employee group. We measure the plan assets and the accrued benefit obligation on October 31 each year.

(o) STOCK-BASED COMPENSATION

In 2003, we adopted the fair-value method of accounting for stock options granted to employees and directors. We recorded stock-based compensation expense in the Consolidated Statement of Income as general and administrative expenses for all options granted on or after January 1, 2003, with a corresponding increase to contributed surplus. Compensation expense for options granted was based on estimated fair values at the time of grant and we recognized the expense over the vesting period of the option.

In May 2004, we modified our stock option plan to a tandem option plan by including a cash feature. The tandem options give the holders a right to either purchase common shares at the exercise price or to receive cash payments equal to the excess of the market value of the common shares over the exercise price. As a result of the modification, we record obligations for the tandem options using the intrinsic-value method of accounting and recognize compensation expense. Obligations are accrued on a graded vesting basis and represent the difference between the market value of our common shares and the exercise price of the options. The obligations are revalued each reporting period based on the change in the market value of our common shares and the number of graded vested options outstanding. We reduce the liability when the options are surrendered for cash. When the options are exercised for stock, the recorded liability amount is transferred to share capital.

Stock options awarded to our US employees on or after December 1, 2004 do not include a cash feature and are not accounted for as tandem options. Instead, we account for these options using the fair-value method. Compensation expense is based on estimated fair values at the time of grant and is recognized over the vesting period of the options. The expense is included as general and administrative expense with a corresponding increase to contributed surplus.

We provide stock appreciation rights to employees as described in Note 9. Obligations are accrued as compensation expense over the graded vesting period of the stock appreciation rights.

(p) CASH AND CASH EQUIVALENTS

Cash and cash equivalents include short-term, highly liquid investments that mature within three months of their purchase. They are recorded at cost, which approximates market value.

(q) TRANSPORTATION

We pay to transport the crude oil, natural gas and chemicals products that we market, and then bill our customers for the transportation. This transportation is presented in our Consolidated Financial Statements as a cost to us and is recorded as transportation and other.

(r) CHANGES IN ACCOUNTING PRINCIPLES

ASSET RETIREMENT OBLIGATIONS (ARO)

On January 1, 2004, we retroactively adopted the Canadian Institute of Chartered Accountants (CICA) standard S.3110, ASSET RETIREMENT OBLIGATIONS. This new standard requires recognition of a liability for the future retirement obligations associated with our property, plant and equipment, which includes oil and gas wells and facilities, and chemicals plants. We previously provided for dismantlement and site restoration costs on our oil and gas wells and facilities, and chemicals plants based on estimates established by current legislation and industry practices. We recorded a provision for these costs in DD&A based on proved reserves or estimated remaining asset lives. The change was adopted retroactively and all prior periods presented have been restated.

84

FINANCIAL INSTRUMENTS

In the fourth quarter of 2004, we retroactively adopted the changes to CICA standard S.3860, FINANCIAL INSTRUMENTS. These changes require that fixed-amount contractual obligations that can be settled by issuing a variable number of equity instruments be classified as a liability. Our US-dollar denominated preferred and subordinated securities have these characteristics and accordingly have been reclassified as long-term debt. Dividends and interest on these securities have been included in interest expense and issue costs previously charged to retained earnings have been amortized over the life of the securities. Unamortized issue costs have been expensed on the redemption of the preferred securities in 2003 and 2004. Foreign exchange gains or losses from translation of the US-dollar amounts have been included as cumulative foreign currency translation adjustments. The change was adopted retroactively and all prior periods presented have been restated.

GENERALLY ACCEPTED ACCOUNTING PRINCIPLES

In 2004, we adopted CICA standard S.1100, GENERALLY ACCEPTED ACCOUNTING PRINCIPLES which eliminated general practice in Canada as a component of GAAP. Our accounting policy for 2004 is to include geological and geophysical costs as operating cash outflows in our Consolidated Statement of Cash Flows. For previous years, we included geological and geophysical costs as investing cash outflows consistent with industry practice in Canada. In our Consolidated Statement of Cash Flows for 2004, we included $73 million of geological and geophysical costs as other operating cash outflows. For 2003 and 2002, geological and geophysical costs of $62 million and $80 million, respectively, are included in investing activities as exploration and development capital expenditures. This change in accounting policy was adopted prospectively.

IMPACT OF CHANGES IN ACCOUNTING PRINCIPLES

The impact of the changes on our 2004 Consolidated Statement of Income resulted in additional interest expense of $3 million for dividends on preferred securities, additional transportation and other expense of $11 million for the unamortized issue costs on the redemption of preferred securities, and a corresponding reduction in the provision for income taxes of $6 million. The impact of these changes in accounting principles on our Consolidated Statement of Income and Earnings per Common Share for the years ended December 31, 2003 and 2002 and on our Consolidated Balance Sheet at December 31, 2003, are shown below.

CONSOLIDATED STATEMENT OF INCOME FOR THE YEARS ENDED DECEMBER 31, 2003 AND 2002

                                                                                  2003      2002
-------------------------------------------------------------------------------------------------
Depletion, Depreciation, Amortization and Impairment Expense as Reported (1)       995      632
    Less:  Dismantlement and Site Restoration                                      (33)     (35)
    Plus:  Asset Retirement Cost Amortization                                       14       15
    Plus:  Asset Retirement Obligation Accretion                                    19       20
                                                                                -----------------
Depletion, Depreciation, Amortization and Impairment Expense as Restated           995      632
                                                                                -----------------

Transportation and Other Expense as Reported                                       461      475
    Plus:  Unamortized Issue Costs on Redemption of Preferred Securities            28       --
                                                                                -----------------
Transportation and Other Expense as Restated                                       489      475
                                                                                -----------------

Interest Expense as Reported                                                       105      109
    Plus:  Dividends on Preferred Securities                                        64       72
                                                                                -----------------
Interest Expense as Restated                                                       169      181
                                                                                -----------------

Provision for Future Income Taxes as Reported (1)                                  (42)     (15)
    Plus:  Tax Effect of Changes in Accounting Principles                          (31)     (29)
                                                                                -----------------
Provision for Future Income Taxes as Restated                                      (73)     (44)
                                                                                -----------------

Note:
(1) Adjusted for discontinued operations.

85

NET INCOME AND EARNINGS PER COMMON SHARE FOR THE YEARS ENDED DECEMBER 31, 2003 AND 2002

                                                                                              2003          2002
----------------------------------------------------------------------------------------------------------------
Net Income Attributable to Common Shareholders
    As Reported                                                                                599           409
    Less: Unamortized Issue Costs on Preferred Securities Redemption, Net of Income Taxes      (21)           --
                                                                                            --------------------
    As Restated                                                                                578           409
                                                                                            =====================

Earnings per Common Share ($/share)
    Basic as Reported                                                                         4.84          3.34
                                                                                            =====================
    Restated                                                                                  4.67          3.34
                                                                                            =====================

    Diluted as Reported                                                                       4.79          3.30
                                                                                            =====================
    Restated                                                                                  4.63          3.30
                                                                                            =====================

CONSOLIDATED BALANCE SHEET AS AT DECEMBER 31, 2003

                                                                                        FINANCIAL
                                                                                ARO   INSTRUMENTS
                                                         AS REPORTED         CHANGE        CHANGE    AS RESTATED
----------------------------------------------------------------------------------------------------------------
Property, Plant and Equipment                                  4,469             81            --          4,550
Deferred Charges and Other Assets                                153             --            11            164
Current Portion of Long-Term Debt                                291             --           281            572
Long-Term Debt                                                 2,485             --            32          2,517
Future Income Tax Liabilities                                    724            (17)           13            720
Asset Retirement Obligations                                      --            305            --            305
Dismantlement and Site Restoration                               179           (179)           --             --
Preferred and Subordinated Securities                            364             --          (364)            --
Retained Earnings                                              1,659            (28)          (37)         1,594
Cumulative Foreign Currency Translation Adjustment              (119)            --            86            (33)
                                                         -------------------------------------------------------

(s) RECLASSIFICATION

Certain information provided for prior years has been reclassified to conform to the presentation adopted in 2004.

2. BUSINESS ACQUISITION

On December 1, 2004, we acquired 100% of the issued and outstanding share capital of EnCana (UK) Limited (EnCana UK) from EnCana Corporation (EnCana) for cash consideration of US$2.1 billion, subject to certain adjustments. EnCana UK held all of EnCana's offshore oil and gas assets in the North Sea.

We acquired EnCana UK to establish a strategic presence in the North Sea by acquiring operatorship of the Buzzard field development and operatorship of the producing Scott and Telford fields. The acquisition also gives us access to interests in several satellite discoveries and over 700,000 net undeveloped exploration acres. In addition, we acquired the management and technical teams that found and are developing the Buzzard discovery. Goodwill paid is attributable to the established North Sea presence acquired and the knowledge and business relationships acquired through the management team and employees of EnCana UK.

86

The acquisition has been accounted for using the purchase method and the results of EnCana UK have been consolidated with the results of Nexen from December 1, 2004. The following table shows the allocation of the purchase price based on the estimated fair value of the assets and liabilities acquired:

--------------------------------------------------------------------------
Purchase Price, Net of Cash Acquired:
    Cash Paid                                                       2,561
    Transaction Costs                                                  22
                                                                   -------
                                                                    2,583
                                                                   =======
Purchase Price Allocated as follows:
    Accounts Receivable                                               310
    Inventories and Supplies                                           11
    Other Current Assets                                                2
    Property, Plant and Equipment                                   3,395
    Future Income Tax Assets                                          239
    Goodwill (1)                                                      334
    Deferred Charges and Other Assets                                  12
    Accounts Payable and Accrued Liabilities                         (289)
    Asset Retirement Obligations                                     (134)
    Future Income Tax Liabilities                                  (1,284)
    Deferred Credits and Other Liabilities                            (13)
                                                                   -------
      Total Purchase Price Allocated                                2,583
                                                                   =======

Note:
(1)  The amount of goodwill deductible for tax purposes is nil.

The unaudited pro forma results for the years ended December 31, 2004 and 2003 are shown below as if the acquisition had occurred on January 1, 2003. Pro forma results are not necessarily indicative of actual results or future performance.

                                                                2004       2003
--------------------------------------------------------------------------------
Revenues                                                       4,258      3,642
Net Income                                                       841        595
Earnings Per Common Share - Basic ($/share)                     6.54       4.81
Earnings Per Common Share - Diluted ($/share)                   6.46       4.75
                                                              ------------------
3.       ACCOUNTS RECEIVABLE

                                                                2004       2003
--------------------------------------------------------------------------------
Trade
    Marketing                                                  1,452      1,078
    Oil and Gas                                                  593        263
    Chemicals and Other                                           57         47
                                                              ------------------
                                                               2,102      1,388
Non-Trade                                                         49         50
                                                              ------------------
                                                               2,151      1,438
Allowance for Doubtful Receivables                               (15)       (15)
                                                              ------------------
Total Accounts Receivable                                      2,136      1,423
                                                              ==================

4.       INVENTORIES AND SUPPLIES

                                                                2004       2003
--------------------------------------------------------------------------------
Finished Products
    Marketing                                                    199        138
    Oil and Gas                                                    6         16
    Chemicals and Other                                           13         12
                                                              -----------------
                                                                 218        166
Work in Process                                                    4          6
Field Supplies                                                   129         98
                                                              -----------------
Total Inventories and Supplies                                   351        270
                                                              =================

87

5.       PROPERTY, PLANT AND EQUIPMENT

                                                   2004                                       2003
------------------------------------------------------------------------------------------------------------------
                                            Accumulated    Net Book                    Accumulated       Net Book
                                   Cost            DD&A       Value            Cost           DD&A          Value
                               -------------------------------------  --------------------------------------------
Oil and Gas
    Yemen                           678            506          172            656             489            167
    Yemen - Carried Interest      1,360          1,044          316          1,242           1,008            234
    Canada                        3,463          1,615        1,848          2,951           1,460          1,491
    United States                 2,249          1,037        1,212          2,153             887          1,266
    United Kingdom                3,499             16        3,483             --              --             --
    Other Countries                 535            408          127            534             410            124
    Marketing                       157             64           93            158              57            101
                               -------------------------------------  --------------------------------------------
                                 11,941          4,690        7,251          7,694           4,311          3,383
Syncrude                          1,030            155          875            821             144            677
Chemicals                           815            409          406            774             381            393
Corporate and Other                 201             90          111            168              71             97
                               -------------------------------------  --------------------------------------------

Total PP&E                       13,987          5,344        8,643          9,457           4,907          4,550
                               =====================================  ============================================

The above table includes capitalized costs of $3,945 million (2003 - $630 million) relating to unproved properties and projects under construction or development. These costs are not being depreciated, depleted or amortized. We currently have an interest in an exploration block, offshore Nigeria, where capitalized exploratory costs have been on our balance sheet for longer than one year. Major capital expenditures are required before production can begin and additional drilling efforts are underway to fully appraise the block. Exploratory drilling costs were first capitalized in 1998 and we have subsequently drilled a further seven successful wells on the block. We are preparing a field development plan for the block with our partners for submission to the Nigerian government for approval. Once we obtain this approval and the project has been sanctioned, we will book proved reserves. Capitalized costs relating to this exploration block as at December 31, 2004 were $77 million (2003 - $68 million).

Our 2003 depreciation, depletion, amortization and impairment expense in the Consolidated Statement of Income includes an impairment charge of $269 million relating to certain Canadian oil and gas properties. The impairment results from negative reserve revisions and is largely attributable to Canadian heavy oil properties. The revisions resulted from changes in late field-life economic assumptions, changes in proved undeveloped reserves based on drilling results and geological mapping, and reassessments of estimated future production profiles.

We incurred $35 million (2003 - $20 million) related to research and development activities. Costs of $26 million (2003 - $14 million) were recorded in other expense on the Consolidated Statement of Income. The remaining costs have been deferred and are included in PP&E.

                                                                2004        2003
--------------------------------------------------------------------------------
Development Costs Deferred, Beginning of Year                     6         --
    Deferred in the Year                                          9          6
    Amortized in the Year                                        --         --
                                                               -----------------
Development Costs Deferred, End of Year                          15          6
                                                               =================

88

6. DERIVATIVE INSTRUMENTS AND FINANCIAL RISK MANAGEMENT

(a) CARRYING VALUE AND ESTIMATED FAIR VALUE OF DERIVATIVE AND FINANCIAL INSTRUMENTS

The carrying value, fair value, and unrecognized gains or losses on our outstanding derivatives and long-term financial assets and liabilities at December 31 are:

(Cdn$ millions)                                             2004                                       2003
---------------------------------------------------------------------------------------------------------------------
                                           Carrying      Fair    Unrecognized    Carrying      Fair     Unrecognized
                                              Value     Value     Gain/(Loss)       Value     Value      Gain/(Loss)
                                          ------------------------------------  -------------------------------------
Commodity Price Risk
    Non-Trading Activities
      Future Sale of Oil and Gas
        Production                               --        --              --          --        (3)             (3)
      Crude Oil Put Options                     200       200              --          --        --              --

    Trading Activities
      Crude Oil and Natural Gas                  83        83              --         101       101              --
      Future Sale of Gas Inventory               --         6               6          --       (11)            (11)

Foreign Currency Risk
    Non-Trading Activities                        7         7              --          --        (1)             (1)
    Trading Activities                           10        10              --           5         5              --
                                          ------------------------------------  -------------------------------------
      Total Derivatives                         300       306               6         106        91             (15)
                                          ====================================  =====================================

Financial Assets and Liabilities
      Long-Term Debt                         (4,259)   (4,503)           (244)     (3,089)   (3,316)           (227)
                                          ====================================  =====================================

The estimated fair value of all derivative instruments is based on quoted market prices and, if not available, on estimates from third-party brokers or dealers. The carrying value of cash and cash equivalents, amounts receivable and short-term obligations approximates their fair value because the instruments are near maturity.

(b) COMMODITY PRICE RISK MANAGEMENT

NON-TRADING ACTIVITIES

We generally sell our crude oil and natural gas under short-term market based contracts.

FUTURE SALE OF OIL AND GAS PRODUCTION

In 2003, we entered into WTI and NYMEX gas forward contracts for a 12-month period. These forward contracts fixed our oil and gas prices at the contract prices for the hedged volumes, less applicable price differentials. Since actual prices during the contract period were higher than the fixed prices we received, our return was lower than it would have been without these contracts in place. These contracts expired in March 2004.

CRUDE OIL PUT OPTIONS

We purchased WTI crude oil put options to manage the commodity price risk exposure of a portion of our oil production in 2005 and 2006. These options establish an annual average WTI floor price of US$43/bbl in 2005 and US$38 in 2006 at a cost of $144 million. The WTI crude oil put options are stated at fair value and included in deferred charges and other assets as they settle beyond 12 months of the balance sheet date. Any change in fair value is included in marketing and other on the Consolidated Statement of Income.

                                     NOTIONAL                     AVERAGE             MARKET
                                      VOLUMES        TERM     PRICE (WTI)              VALUE
---------------------------------------------------------------------------------------------
                                     (bbls/d)                   (US$/bbl)     (Cdn$ millions)
WTI Crude Oil Put Options              30,000        2005              44                 57
                                       20,000        2005              43                 33
                                       10,000        2005              41                 12
                                       30,000        2006              39                 53
                                       20,000        2006              38                 32
                                       10,000        2006              36                 13
                                                                                      -------
                                                                                         200
                                                                                      =======

89

TRADING ACTIVITIES

CRUDE OIL AND NATURAL GAS

We enter into physical purchase and sales contracts as well as financial commodity contracts to enhance our price realizations and lock-in our margins. The physical and financial commodity contracts (derivative contracts) are stated at market value. The $83 million fair value of the contracts has been recognized in net income.

FUTURE SALE OF GAS INVENTORY

We have certain NYMEX futures contracts and swaps in place, which effectively lock-in our margins on the future sale of our natural gas inventory in storage. We have designated, in writing, some of these derivative contracts as cash flow hedges of the future sale of our storage inventory. As a result, gains and losses on these designated futures contracts and swaps are recognized in net income when the inventory in storage is sold. The principal terms of these outstanding contracts and the unrecognized gains and losses at December 31, 2004 are:

                                        HEDGED                      AVERAGE    UNRECOGNIZED
                                       VOLUMES            MONTH       PRICE            GAIN
--------------------------------------------------------------------------------------------
                                        (mmcf)                     (US$/mcf) (Cdn$ millions)
NYMEX Natural Gas Futures                3,740     January 2005       6.825               2
                                         5,660    February 2005        6.53               2

NYMEX Natural Gas Fixed Price Swaps      1,000     January 2005       7.147               1
                                           500    February 2005       6.987               1
                                                                                     -------
                                                                                          6
                                                                                     =======

(c) FOREIGN CURRENCY EXCHANGE RATE RISK MANAGEMENT

NON-TRADING ACTIVITIES

We designate our US-dollar debt as a hedge against our net investment in self-sustaining foreign operations. The US-dollar debt issued in November 2003 to re-finance existing designated US-dollar debt was designated as part of the hedge in February 2004. In December 2004, we drew US$1.5 billion against term credit facilities established for our North Sea acquisition. This amount has been designated as a hedge of our investment in our self-sustaining foreign operations.

The foreign exchange gains or losses related to the designated debt are included in the cumulative foreign currency translation adjustment in shareholders' equity. Undesignated foreign exchange gains or losses on the November 2003 debt issues were included in marketing and other prior to the designation of this debt as a hedging instrument in February 2004. Our net investment in self-sustaining foreign operations and our designated US-dollar debt at December 31 are as follows:

(US$ millions)                                                2004         2003
--------------------------------------------------------------------------------
    Net Investment in Self-Sustaining Foreign Operations      3,973       1,574
    US-Dollar Debt                                            3,315       1,143
                                                             -------------------

We also have exposure to currencies other than the US dollar. A portion of our capital spending on our Long Lake project is denominated in Euros and Japanese Yen. A portion of our United Kingdom operating expenses and capital spending is denominated in British Pounds and Euros. We do not have any material exposure to highly inflationary foreign currencies.

We occasionally use derivative instruments to effectively convert cash flows from Canadian to US dollars and vice versa. At December 31, 2004, we held a foreign currency derivative instrument that obligates us and the counterparty to exchange principal and interest amounts. In November 2006, we will pay US$37 million and receive Cdn $50 million (see Note 7). We have recognized a gain of $7 million for the fair value of this derivative instrument.

TRADING ACTIVITIES

Our sales and purchases of crude oil and natural gas are generally transacted in or referenced to the US dollar, as are most of the financial commodity contracts used by our marketing group. We enter into forward contracts to sell US dollars. When combined with certain commodity sales contracts, either physical or financial, these forward contracts allow us to lock-in our margins on the future sale of crude oil and natural gas. The fair value of our US dollar forward contracts at December 31, 2004 was $10 million (2003 - $5 million). This fair value has been recognized in net income and settles within one year.

90

(d) TOTAL CARRYING VALUE OF DERIVATIVE CONTRACTS RELATED TO TRADING ACTIVITIES

Amounts related to derivative instruments held by our marketing operation are equal to fair value as we use mark-to-market accounting, and are as follows at December 31:

(Cdn $millions)                                               2004         2003
--------------------------------------------------------------------------------
Accounts Receivable                                            177          102
Deferred Charges and Other Assets (1)                           91           63
                                                             -------------------
    Total Derivative Contract Assets                           268          165
                                                             ===================

Accounts Payable and Accrued Liabilities                       129           34
Deferred Credits and Other Liabilities (1)                      46           25
                                                             -------------------
    Total Derivative Contract Liabilities                      175           59
                                                             ===================

    Total Derivative Contract Net Assets                        93          106
                                                             ===================

Note:
(1) These derivative instruments settle beyond 12 months and are considered non-current.

(e) INTEREST RATE RISK MANAGEMENT

We use fixed and floating rate debt to finance our operations. The floating rate debt exposes us to changes in interest payments as interest rates fluctuate. To manage this exposure, we maintain a combination of fixed and floating rate borrowings and facilities. At December 31, 2004, fixed-rate borrowings comprised 56% (2003 - 100%) of our long-term debt at an effective average rate of 6.6% (2003 - 8.2%). During the year we periodically drew on our floating rate unsecured syndicated term credit facilities. We had no interest rate swaps outstanding in 2004 or 2003.

(f) CREDIT RISK MANAGEMENT

A substantial portion of our accounts receivable are with counterparties in the energy industry and are subject to normal industry credit risk. This concentration of risk within the energy industry is reduced because of our broad base of domestic and international counterparties. We assess the financial strength of our counterparties, including those involved in marketing and other commodity arrangements, and we limit the total exposure to individual counterparties. As well, a number of our contracts contain provisions that allow us to demand the posting of collateral in the event downgrades to non-investment grade credit ratings occur. Credit risk, including credit concentrations, is routinely reported to our Risk Management Committee. We also use standard agreements that allow for the netting of exposures associated with a single counterparty. We believe this minimizes our overall credit risk.

7. LONG-TERM DEBT AND SHORT-TERM BORROWINGS

                                                                  2004     2003
--------------------------------------------------------------------------------
Acquisition Credit Facilities (US$1.5 billion drawn) (a)         1,806       --
Term Credit Facilities (US$72 million drawn) (b)                    87       --
Notes, due 2004 (c)                                                 --      291
Debentures, due 2006 (d)                                            93       98
Medium Term Notes, due 2007 (e)                                    150      150
Medium Term Notes, due 2008 (f)                                    125      125
Notes, due 2013 (US$500 million) (g)                               602      646
Notes, due 2028 (US$200 million) (h)                               241      258
Notes, due 2032 (US$500 million) (i)                               602      646
Subordinated Debentures, due 2043 (US$460 million) (j)             553      594
Preferred Securities, due 2048 (US$217 million) (k)                 --      281
                                                                ----------------
                                                                 4,259    3,089
Less: Current Portion of Long-Term Debt (c) (k)                     --     (572)
                                                                ----------------
                                                                 4,259    2,517
                                                                ================

(a) ACQUISITION CREDIT FACILITIES

Nexen has committed, unsecured, non-revolving credit facilities totalling US$2 billion. The credit facilities include a bridge facility in the amount of US$1.5 billion, which was advanced on December 1, 2004 and used to fund a portion of the purchase price for the acquisition of EnCana (UK) Limited and a development facility in the amount of US$500 million, which may be drawn upon to finance a portion of our share of the costs for the development and operation of the acquired assets.

91

The credit facilities provide that the bridge facility shall not exceed US$750 million by November 2005 with the balance to be repaid by May 2007. The credit facilities also provide that the development facility be repaid by November 2007, unless this date is extended to May 2008. Optional repayments may be made by Nexen at any time with notice. Borrowings are available as US-dollar base rate loans, LIBOR-based loans, Canadian bankers' acceptances and Canadian prime rate loans. Interest is payable monthly at a floating rate. During 2004, the weighted average interest rate on the acquisition credit facilities was 3.2%.

Amounts due November 2005 with respect to the bridge facility have not been included in current liabilities as we are able to refinance this amount with our term credit facilities, if need be.

(b) TERM CREDIT FACILITIES

Nexen has committed, unsecured, revolving term credit facilities totalling $1,656 million, $410 million of which is available until 2008 and $1,246 million until 2009. At December 31, 2004, US$72 million was drawn on these facilities. The lenders have the option to extend the terms annually. Borrowings are available as Canadian bankers' acceptances, LIBOR-based loans, Canadian prime loans or US-dollar base rate loans. Interest is payable monthly at a floating rate. During 2004, the weighted average interest rate was 3.2% (2003 - 2.0%).

(c) NOTES, DUE 2004

During February 2004, we repaid US$225 million of notes.

(d) DEBENTURES, DUE 2006

During November 1996, we issued $100 million of unsecured 10-year redeemable debentures. Interest is payable semi-annually at a rate of 6.85% and the principal is to be repaid in November 2006. In December 1996, $50 million of this obligation was effectively converted through a currency exchange contract with a Canadian chartered bank to a US$37 million liability bearing interest at 6.75% for the term of the debentures. We may redeem part or all of the debentures at any time. The redemption price will be the greater of par and an amount that provides the same yield as a Government of Canada Bond having a term to maturity equal to the remaining term of the debentures plus 0.1%.

(e) MEDIUM TERM NOTES, DUE 2007

During July 1997, we issued $150 million of notes. Interest is payable semi-annually at a rate of 6.45% and the principal is to be repaid in July 2007. We may redeem part or all of the notes at any time. The redemption price will be the greater of par and an amount that provides the same yield as a Government of Canada Bond having a term to maturity equal to the remaining term of the notes plus 0.125%.

(f) MEDIUM TERM NOTES, DUE 2008

During October 1997, we issued $125 million of notes. Interest is payable semi-annually at a rate of 6.3% and the principal is to be repaid in June 2008. We may redeem part or all of the notes at any time. The redemption price will be the greater of par and an amount that provides the same yield as a Government of Canada Bond having a term to maturity equal to the remaining term of the notes plus 0.125%.

(g) NOTES, DUE 2013

During November 2003, we issued US$500 million of notes. Interest is payable semi-annually at a rate of 5.05% and the principal is to be repaid in November 2013. We may redeem part or all of the notes at any time. The redemption price will be the greater of par and an amount that provides the same yield as a US Treasury security having a term to maturity equal to the remaining term of the notes plus 0.2%.

(h) NOTES, DUE 2028

During April 1998, we issued US$200 million of notes. Interest is payable semi-annually at a rate of 7.4% and the principal is to be repaid in May 2028. We may redeem part or all of the notes any time. The redemption price will be the greater of par and an amount that provides the same yield as a US Treasury security having a term to maturity equal to the remaining term of the notes plus 0.25%.

(i) NOTES, DUE 2032

During March 2002, we issued US$500 million of notes. Interest is payable semi-annually at a rate of 7.875% and the principal is to be repaid in March 2032. We may redeem part or all of the notes at any time. The redemption price will be the greater of par and an amount that provides the same yield as a US Treasury security having a term to maturity equal to the remaining term of the notes plus 0.375%.

92

(j) SUBORDINATED DEBENTURES, DUE 2043

During November 2003, we issued US$460 million of unsecured subordinated debentures. Interest is payable quarterly in cash at a rate of 7.35% and the principal is to be repaid in November 2043. We may redeem part or all of the debentures at any time on or after November 8, 2008. The redemption price is equal to the par value of the principal amount plus any accrued and unpaid interest to the redemption date. We may choose to redeem the principal amount with either cash or common shares.

(k) PREFERRED SECURITIES, DUE 2048

During March 1998, we issued US$217 million of preferred securities. The securities were redeemed at par on February 9, 2004. Interest was payable quarterly at a rate of 9.375%.

(l) DEBT REPAYMENTS

------------------------------------------------------------------------
2005                                                                903
2006                                                                 93
2007                                                              1,075
2008                                                                190
2009                                                                 --
Thereafter                                                        1,998
                                                                 -------
Total Debt Repayments                                             4,259
                                                                 =======

(m) DEBT COVENANTS

Some of our debt instruments contain covenants with respect to certain financial ratios and our ability to grant security. At December 31, 2004, we were in compliance with all covenants.

(n) SHORT-TERM BORROWINGS

Nexen has unsecured operating loan facilities of approximately $349 million, of which $100 million was drawn (US$83 million) at December 31, 2004. Interest is payable at floating rates. During 2004, the weighted average interest rate on our short-term borrowings was 2.9% (2003 - 2.4%).

(o) INTEREST EXPENSE

                                                    2004       2003        2002
--------------------------------------------------------------------------------
Long-Term Debt                                       182        204        206
Other                                                 12          8          6
                                                   -----------------------------
Total                                                194        212        212
    Less: Capitalized                                (51)       (43)       (31)
                                                   -----------------------------
Total Interest Expense                               143        169        181
                                                   =============================

Capitalized interest relates to and is included as part of the cost of oil and gas and Syncrude properties. The capitalization rates are based on our weighted-average cost of borrowings.

8. ASSET RETIREMENT OBLIGATIONS

Changes in carrying amounts of the asset retirement obligations associated with our property, plant and equipment are as follows:

                                                              2004         2003
--------------------------------------------------------------------------------
Balance at Beginning of Year                                   323          390
    Obligations Assumed with Development Activities             12            6
    Obligations Assumed with Business Acquisition              134           --
    Obligations Discharged with Disposed Properties             (4)         (27)
    Expenditures Made on Asset Retirements                     (31)         (20)
    Accretion                                                   17           22
    Revisions to Estimates                                      24          (19)
    Effect of Foreign Exchange                                  (7)         (29)
                                                             -------------------
Balance at End of Year (1)                                     468          323
                                                             ===================

Note:
(1) Obligations due within 12 months of $47 million (2003 - $18 million) have been included in accounts payable and accrued liabilities.

93

Our total estimated undiscounted asset retirement obligations amount to $770 million ($514 million - December 31, 2003). We have discounted the total estimated asset retirement obligations using a weighted-average, credit-adjusted risk-free rate of 5.7%. Approximately $121 million included in our asset retirement obligations will be settled over the next five years. The remaining obligations settle beyond five years and will be funded by future cash flows from our operations.

We own interests in assets for which the fair value of the asset retirement obligations cannot be reasonably determined because the assets currently have an indeterminate life and we cannot determine when remediation activities would take place. These assets include our interest in Syncrude's upgrader and sulphur pile.

The estimated future recoverable reserves at Syncrude are significant and given the long life of this asset, we are unable to determine when asset retirement activities would take place. Furthermore, the Syncrude plant can continue to run indefinitely with ongoing maintenance activities.

The retirement obligations for these assets will be recorded in the first year in which the lives of the assets are determinable.

9. SHAREHOLDERS' EQUITY

(a) AUTHORIZED CAPITAL

Authorized share capital consists of an unlimited number of common shares of no par value, and an unlimited number of Class A preferred shares of no par value, issuable in series.

(b) ISSUED COMMON SHARES AND DIVIDENDS

(thousands of shares)                                2004       2003       2002
--------------------------------------------------------------------------------
Beginning of Year                                 125,606    122,966    121,202
Issue of Common Shares for Cash:
    Exercise of Stock Options                       2,951      1,964      1,090
    Dividend Reinvestment Plan                        448        476        500
    Employee Flow-through Shares                      195        200        174
                                                 -------------------------------
End of Year                                       129,200    125,606    122,966
                                                 ===============================

Dividends per Common Share ($/share)                 0.40      0.325       0.30
                                                 ===============================

Cash Consideration (Cdn$ millions)
    Exercise of Stock Options                          93         50        27
    Dividend Reinvestment Plan                         21         15        17
    Employee Flow-through Shares                       10          8         7
                                                 -------------------------------
                                                      124         73        51
                                                 ===============================

At December 31, 2004, there were 689,937 common shares (2003 - 1,307,305; 2002 - 1,783,968) reserved for issuance under the Dividend Reinvestment Plan.

(c) STOCK OPTIONS

In May 2004, our shareholders approved the modification of our stock option plan to a tandem option plan by including a cash feature. The tandem options give the holders a right to either purchase common shares at the exercise price or to receive cash payments equal to the excess of the market value of the common shares over the exercise price.

Similar to our stock appreciation rights, we use the intrinsic-value method to recognize compensation expense associated with our tandem options. Obligations are accrued on a graded vesting basis and represent the difference between the market value of our common shares and the exercise price of the options. The obligations are revalued each reporting period based on the change in the market value of our common shares and the number of graded vested options outstanding.

Upon modification of the stock option plan, we were required to recognize an obligation for our tandem options. This obligation represented the difference between the market value of our common shares and the weighted-average exercise price of the options. As a result, we recognized an obligation of $85 million for the graded vested portion of the 6.3 million outstanding options on June 30, 2004. In the second quarter, a one-time, non-cash charge of $82 million was included in general and administrative expense, net of $3 million previously expensed in respect of our original stock options.

94

Following the introduction of the AMERICAN JOB CREATION ACT OF 2004 in the US, stock options awarded to our US employees on or after December 1, 2004 do not include a tandem option cash feature. We use the fair-value method to recognize compensation expense associated with these options. The expense is recognized over the vesting period of the options with a corresponding increase to contributed surplus. This resulted in compensation expense in 2004 of $0.1 million which was included in general and administrative expense.

We have granted options to purchase common shares to directors, officers and employees. Each option permits the holder to purchase one Nexen common share at the stated exercise price. Options granted prior to February 2001 vest over 4 years and are exercisable on a cumulative basis over 10 years. Options granted after February 2001 vest over 3 years and are exercisable on a cumulative basis over 5 years. At the time of grant, the exercise price equals the market price. The following options have been granted:

                                                             2004                        2003                     2002
                                                  ----------------------------------------------------------------------------
                                                                  Weighted                 Weighted                  Weighted
                                                                   Average                  Average                   Average
                                                                  Exercise                 Exercise                  Exercise
                                                      Options        Price      Options       Price      Options        Price
------------------------------------------------------------------------------------------------------------------------------
                                                  (thousands)    ($/option)  (thousands)  ($/option)  (thousands)   ($/option)
BALANCE AT BEGINNING OF YEAR                            9,203           34        9,476          30        8,831           30
Granted                                                 2,112           51        1,877          44        1,788           31
Exercised for stock                                    (2,951)          30       (1,964)         28       (1,090)          25
Surrendered for cash                                     (144)          34           --          --           --           --
Forfeited                                                 (82)          33         (186)         32          (53)          30
                                                  ----------------------------------------------------------------------------
BALANCE AT END OF YEAR                                  8,138           39        9,203          34        9,476           30
                                                  ============================================================================

OPTIONS EXERCISABLE AT END OF YEAR                      4,227           34        5,067          30        5,113           29
                                                  ----------------------------------------------------------------------------

COMMON SHARES RESERVED FOR ISSUANCE
   UNDER THE STOCK OPTION PLAN                          9,586                     9,788                    9,760
                                                  ----------------------------------------------------------------------------

The range of exercise prices of options outstanding and exercisable at December 31, 2004 is as follows:

                                                                   OUTSTANDING OPTIONS                   EXERCISABLE OPTIONS
------------------------------------------------------------------------------------------------------------------------------
                                                                           Weighted    Weighted                      Weighted
                                                                            Average     Average                       Average
                                                             Number of     Exercise    Years to       Number of      Exercise
                                                               Options        Price      Expiry         Options         Price
                                                          --------------------------------------    ------------ -------------
                                                           (thousands)    ($/option)     (years)     (thousands)    ($/option)
$15.00 to $19.99                                                  132            18           4             132           18
$20.00 to $24.99                                                  182            24           2             182           24
$25.00 to $29.99                                                  768            27           4             641           27
$30.00 to $34.99                                                1,772            33           3           1,326           33
$35.00 to $39.99                                                1,330            36           6           1,324           36
$40.00 to $44.99                                                1,850            43           4             622           43
$45.00 to $49.99                                                   25            48           4              --           --
$50.00 to $54.99                                                2,079            51           5              --           --
                                                          --------------------------------------    --------------------------
   Total options                                                8,138                                     4,227
                                                          =============                             ============

In previous periods, we estimated the fair value of stock options issued using the Generalized Black-Scholes option pricing model under the following assumptions:

                                                                                                           2003          2002
------------------------------------------------------------------------------------------------------------------------------
Weighted-Average Fair Value ($/option)                                                                    10.10          9.08
Risk-Free Interest Rate (%)                                                                                 3.6           3.6
Estimated Hold Period Prior to Exercise (years)                                                               3             3
Volatility in the Price of Nexen's Common Shares (%)                                                         30            35
Dividends per Common Share ($/share)                                                                       0.40          0.30
                                                                                                    --------------------------

95

The following shows pro forma net income and earnings per common share had we applied the fair-value method to account for all stock options outstanding that were granted up to December 31, 2002. Stock options granted after that date have been expensed as general and administrative costs.

                                                                                                            2003         2002
------------------------------------------------------------------------------------------------------------------------------
Fair Value of Stock Options Granted                                                                           25           22
Less: Fair Value of Stock Options Expensed                                                                    (1)          --
                                                                                                     -------------------------
                                                                                                              24           22
Net Income Attributable to Common Shareholders
    As Reported                                                                                              578          409
                                                                                                     -------------------------
    Pro Forma                                                                                                554          387
                                                                                                     =========================

Earnings Per Common Share ($/share)
    Basic as Reported                                                                                       4.67         3.34
                                                                                                     =========================
    Pro Forma                                                                                               4.48         3.16
                                                                                                     =========================

    Diluted as Reported                                                                                     4.63         3.30
                                                                                                     =========================
    Pro Forma                                                                                               4.44         3.13
                                                                                                     =========================

(d) STOCK APPRECIATION RIGHTS

Under our stock appreciation rights (StARs) plan established in 2001, employees are entitled to cash payments equal to the excess of the market price of the common shares over the exercise price of the right. The vesting period and other terms of the plan are similar to the stock option plan. The total rights granted and outstanding at any time cannot exceed 10% of Nexen's total outstanding common shares. At the time of grant, the exercise price equals the market price. The following stock appreciation rights have been granted:

                                                              2004                       2003                     2002
                                                  ------------------------- ------------------------ -------------------------
                                                                  Weighted                 Weighted                  Weighted
                                                                   Average                  Average                   Average
                                                                  Exercise                 Exercise                  Exercise
                                                        StARs        Price        StARs       Price          StARs      Price
------------------------------------------------------------------------------------------------------------------------------
                                                   (thousands)   ($/right)   (thousands)   ($/right)    (thousands)  ($/right)
BALANCE AT BEGINNING OF YEAR                            2,404           37        1,812          33            915         31
Granted                                                 1,304           51        1,017          43            908         34
Exercised for cash                                       (433)          33         (363)         32             (3)        31
Forfeited                                                 (57)          37          (62)         32             (8)        31
                                                  ---------------------------------------------------------------------------
BALANCE AT END OF YEAR                                  3,218           43        2,404          37          1,812         33
                                                  ===========================================================================

RIGHTS EXERCISABLE AT END OF YEAR                       1,011           36          495          33            306         31
                                                  ---------------------------------------------------------------------------

The range of exercise prices of stock appreciation rights outstanding and exercisable at December 31, 2004 is as follows:

                                                                    Outstanding StARs                     Exercisable StARs
------------------------------------------------------------------------------------------------------------------------------
                                                                           Weighted    Weighted                      Weighted
                                                                            Average     Average                       Average
                                                             Number of     Exercise    Years to       Number of      Exercise
                                                                 StARs        Price      Expiry           StARs