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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                   FORM 11-K

(Mark One)

             [X]    ANNUAL REPORT PURSUANT TO SECTION 15(d)
                    OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE FISCAL YEAR ENDED DECEMBER 31, 2006

                                       OR

             [ ]    TRANSITION REPORT PURSUANT TO SECTION 15(d)
                    OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROM __________ TO __________


                         COMMISSION FILE NO. 001-06702


     A.     Full title of the plan and address of the plan,  if different  from
that of the issuer named below:

                               NEXEN SAVINGS PLAN
                          12790 Merit Drive, Suite 800
                            Dallas, Texas 75251-1270

     B.     Name of issuer of the securities  held pursuant to the plan and the
address of its principal executive office:

                                   NEXEN INC.
                              801 - 7th Avenue SW
                        Calgary, Alberta, Canada T2P 3P7

===============================================================================





NEXEN SAVINGS PLAN

FINANCIAL STATEMENTS AND SUPPLEMENTAL SCHEDULE

DECEMBER 31, 2006 AND 2005







                                C O N T E N T S

                                                                           Page

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM.......................1


FINANCIAL STATEMENTS

   Statements of Net Assets Available for Benefits............................2

   Statements of Changes in Net Assets Available for Benefits.................3

   Notes to Financial Statements..............................................4


SUPPLEMENTAL SCHEDULE *

   Schedule H, line 4i - Schedule of Assets (Held at End of Year)............11



         * Other schedules required by 29 CFR 2520.103-10 of the Department of
         Labor's Rules and Regulations for Reporting and Disclosure under
         Employee Retirement Income Security Act of 1974 have been omitted
         because they are not applicable.






REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


To the Administrative Committee
NEXEN SAVINGS PLAN
Dallas, Texas

We have  audited  the  accompanying  statements  of net  assets  available  for
benefits of the Nexen  Savings  Plan (the  "Plan") as of December  31, 2006 and
2005,  and the  related  statements  of  changes in net  assets  available  for
benefits  for  the  years  then  ended.  These  financial  statements  and  the
supplemental  schedule  referred to below are the  responsibility of the Plan's
Administrative  Committee. Our responsibility is to express an opinion on these
financial statements and schedule based on our audits.

We conducted our audits in accordance  with the standards of the Public Company
Accounting  Oversight Board (United  States).  Those standards  require that we
plan and perform the audits to obtain  reasonable  assurance  about 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,  the financial  statements referred to above present fairly, in
all  material  respects,  the net assets  available  for  benefits of the Nexen
Savings  Plan as of  December  31,  2006 and 2005,  and the  changes in its net
assets  available  for benefits for the years then ended,  in  conformity  with
accounting principles generally accepted in the United States of America.

Our audits  were  performed  for the purpose of forming an opinion on the basic
financial  statements  taken as a whole.  The  supplemental  schedule of assets
(held at end of year) is presented for purposes of  additional  analysis and is
not a required  part of the basic  financial  statements  but is  supplementary
information  required by the  Department of Labor's Rules and  Regulations  for
Reporting and Disclosure under the Employee  Retirement  Income Security Act of
1974. The supplemental  schedule has been subjected to the auditing  procedures
applied in the audit of the basic financial  statements and, in our opinion, is
fairly  stated in all  material  respects in  relation  to the basic  financial
statements taken as a whole.


WEAVER AND TIDWELL, L.L.P.


Dallas, Texas
June 15, 2007



                               NEXEN SAVINGS PLAN
                STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS
                           DECEMBER 31, 2006 AND 2005


                                                        2006               2005
                                               -------------       ------------
              ASSETS

Cash                                           $   2,116,979       $        352
Investments, at fair value                        52,300,199         45,552,975
Participant contributions receivable                       -              1,439
Accrued dividends receivable                               -             13,558
Participant loans                                    788,945            969,883
                                               -------------       ------------
       TOTAL ASSETS                               55,206,123         46,538,207
                                               -------------       ------------
              LIABILITIES

Due to broker                                          1,781                  -
Other payables                                             -                  5
                                               -------------       ------------
       TOTAL LIABILITIES AVAILABLE                     1,781                  5
                                               -------------       ------------
NET ASSETS FOR BENEFITS                        $  55,204,342       $ 46,538,202
                                               =============       ============



The Notes to Financial Statements
are an integral part of these statements.

                                       2


                               NEXEN SAVINGS PLAN
           STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
                 FOR THE YEARS ENDED DECEMBER 31, 2006 AND 2005

                                                         2006              2005
                                                -------------    --------------
ADDITIONS

    Investment income:
       Net appreciation in fair value
         of investments                         $   4,878,615    $    9,946,256
       Interest                                       332,758           271,859
       Dividends                                    2,013,672         1,369,008
                                                -------------    --------------
                                                    7,225,045        11,587,123
                                                -------------    --------------

    Contributions:
       Participants                                 2,305,947         1,980,100
       Employer                                     1,355,299         1,193,594
       Rollover                                       120,823            47,204
                                                -------------    --------------
                                                    3,782,069         3,220,898
                                                -------------    --------------
       TOTAL ADDITIONS                             11,007,114        14,808,021
                                                -------------    --------------
DEDUCTIONS

    Benefits paid to participants                   2,336,249         1,912,767
    Administrative expenses                             4,725             4,763
                                                -------------    --------------
       TOTAL DEDUCTIONS                             2,340,974         1,917,530
                                                -------------    --------------
NET INCREASE IN NET ASSETS AVAILABLE                8,666,140        12,890,491
NET ASSETS AVAILABLE FOR BENEFITS
       Beginning of year                           46,538,202        33,647,711
                                                -------------    --------------
NET ASSETS AVAILABLE FOR BENEFITS
       End of year                              $  55,204,342    $   46,538,202
                                                =============    ==============


The Notes to Financial Statements
are an integral part of these statements.

                                       3


                               NEXEN SAVINGS PLAN
                         NOTES TO FINANCIAL STATEMENTS


NOTE 1.   DESCRIPTION OF THE PLAN

     The  following  description  of the Nexen  Savings  Plan (the  "Plan")  is
     provided for general information  purposes only. More complete information
     regarding the Plan's provisions may be found in the Plan Document.

     The Plan is a defined  contribution  plan that was  adopted  September  1,
     1988,  and  amended and  restated  effective  January 1, 2002,  to provide
     eligible  employees of Nexen  Petroleum  U.S.A.  Inc. (the  "Company") and
     participating  employers,  Nexen Chemicals  U.S.A.  Inc.,  Nexen Marketing
     U.S.A.   Inc.,  Nexen  Oil  and  Gas  U.S.A.  Inc.,  and  Nexen  Petroleum
     International (U.S.A.) Inc. (the "Participating Employers"),  wholly owned
     subsidiaries  of Nexen Inc., and Canexus U.S. Inc., a method to meet their
     long-range  financial  objectives under the requirements of Section 401(k)
     of the  Internal  Revenue  Code.  As more  fully  discussed  in Note 5, on
     December  29,  2006,  an amendment to the plan was executed and adopted to
     remove Nexen Chemicals  U.S.A.,  Inc., Nexen Oil and Gas U.S.A.,  Inc. and
     Canexus U.S., Inc. as participating employers.

     For the years ended December 31, 2006 and 2005,  Nationwide Trust Company,
     FSB (the "Trustee") was the Plan Trustee with the  recordkeeping  function
     performed by The 401(k) Company (the "Recordkeeper").

     All regular employees of the Company and  Participating  Employers who are
     18 years of age and over are  eligible to  participate  in the Plan on the
     entry date coinciding with or next following the date the employee attains
     age 18.  Participant  contributions  are  made on a  voluntary  basis  and
     directly withheld from the participant's eligible compensation, as defined
     in the Plan  Document.  Contributions  may be made with:  pretax  dollars;
     after-tax dollars; a combination of pretax and after-tax dollars;  or from
     an existing Roth 401(k) account.  Eligible  compensation excludes overtime
     and  bonuses.  Participants  are  immediately  vested  in  their  employee
     contribution account and actual earnings thereon.

     The  Company  and  Participating  Employers  will  match  100  percent  of
     Participant   contributions  up  to  6%  of  the  Participant's   eligible
     compensation. In addition, a Participant who completes one hour of service
     after  January  1,  2000,  shall  be  vested  100% in his or her  employer
     matching account.

     The Plan's  investment  options are: (1) Stable Value Trust Fund, (2) Bond
     Fund of America A, (3) American  Century Real Estate  Investment Fund, (4)
     Managers  Special  Equity Fund,  (5) DWS Equity 500 Index Fund, (6) Growth
     Fund of America A, (7) First Eagle Overseas Fund A, (8) EuroPacific Growth
     Fund  A,  (9)  Washington   Mutual  Investors  Fund  A,  (10)  Oppenheimer
     Developing  Markets Fund A, (11) Third Avenue  Value Fund,  (12)  American
     Beacon Small Cap Value Plan,  and (13) Nexen Inc.  Stock Fund. All Company
     and Participating  Employers contributions are invested in accordance with
     the investment choices selected by each respective Participant.


                                       4


                               NEXEN SAVINGS PLAN
                         NOTES TO FINANCIAL STATEMENTS


     NOTE 1.   DESCRIPTION OF THE PLAN - CONTINUED

     Distribution of a Participant's  entire account becomes due in three ways:
     (1) upon  termination  of employment,  (2) death,  or (3)  disability,  as
     defined  in the  Plan  Document.  At the  option  of  the  Participant  or
     beneficiary,  such  account  balances  may be  distributed  in a  lump-sum
     payment or via  periodic  installment  payments as  described  in the Plan
     Document.

     Withdrawals  from  the  Plan by  active  Participants  are  permitted  for
     specific instances of financial hardship and age 59 1/2 withdrawals, which
     can be made once every six months.  Once per Plan year, a Participant  may
     withdraw a portion or all of his or her  after-tax  and rollover  account,
     subject to a $250 minimum.

     In  December  2005,  the  Financial   Accounting  Standards  Board  issued
     Statement of Position (SOP) 94-4-1, "REPORTING OF FULLY BENEFIT-RESPONSIVE
     INVESTMENT  CONTRACTS HELD BY CERTAIN INVESTMENT  COMPANIES SUBJECT TO THE
     AICPA INVESTMENT COMPANY GUIDE AND DEFINED-CONTRIBUTION HEALTH AND WELFARE
     AND PENSION PLANS," which affects defined  contribution  pension plans and
     health and  welfare  plans that hold fully  benefit-responsive  investment
     contracts.  Presently,  the  Plan  has no  investment  contracts  that are
     considered fully benefit-responsive for purposes of SOP 94-4-1.


NOTE 2.   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     USE OF ESTIMATES

         The preparation of financial  statements in conformity with accounting
         principles generally accepted in the United States requires management
         to make estimates and assumptions  that affect the reported amounts of
         net assets available for benefits and disclosure of contingent  assets
         and  liabilities  at the  date  of the  financial  statements  and the
         reported  amounts  of  additions  to and  deductions  from net  assets
         available for benefits  during the reporting  period.  Actual  results
         could differ from those estimates.

     BASIS OF ACCOUNTING

         The  financial  statements  of the Plan are  presented  on the accrual
         basis of accounting in accordance with accounting principles generally
         accepted in the United States of America.  Current year contributions,
         expenses,   and  investment   income,   including  both  interest  and
         dividends,  which are not received or paid until the subsequent  year,
         are accrued in the current year. Benefits are recorded when paid.


                                       5


                               NEXEN SAVINGS PLAN
                         NOTES TO FINANCIAL STATEMENTS


NOTE 2.   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CONTINUED

     INVESTMENTS - CONTINUED

         Investments  are stated at fair value as determined by the Trust based
         on quoted market prices at the Plan's year end. Purchases and sales of
         investments  are  recorded  on a trade date  basis.  Participants  may
         direct their contributions and any related earnings into many distinct
         investment  options,  including the Nexen Inc. Stock Fund. Interest is
         allocated to Participant accounts on a pro-rata basis depending on the
         Participants'  account  balance.  Dividends are allocated based on the
         number of shares in a Participant's account.

         A brief description of investment options is as follows:

           STABLE  VALUE  TRUST  FUND - The  Stable  Value  Trust  Fund's  core
           investment  vehicle is the AMVESCAP  National  Trust Company  Stable
           Value Trust Fund. The remaining  portion of the money is invested in
           money  market  funds  offered  through  the  following  mutual  fund
           families:  The American  Funds Group,  Oppenheimer  Funds,  Managers
           Funds, Third Avenue Funds, American Century Investments, First Eagle
           Funds, and DWS Scudder Funds.

           AMERICAN  BEACON  SMALL CAP VALUE PLAN - is a small  value fund that
           seeks long-term capital appreciation and current income by investing
           over 80% of its assets in equity  securities of companies within the
           United States.

           BOND  FUND  OF  AMERICA  A  -  invests  primarily  in  high  quality
           intermediate-term corporate bonds and U.S. government securities.

           AMERICAN  CENTURY  REAL  ESTATE  INVESTMENT  FUND - seeks  long-term
           capital appreciation;  current income is a secondary  consideration.
           The fund  invests  at least  80% of  assets  in  equities  issued by
           companies in the real estate industry.

           MANAGERS  SPECIAL  EQUITY  FUND - is a small  growth fund that seeks
           long-term  capital  appreciation by investing at least 80% of assets
           in equity securities.

           DWS  EQUITY 500 INDEX  FUND - is a large  company  growth and income
           fund that  invests  primarily  in  equity  securities  of  companies
           included in the S & P 500.

           GROWTH FUND OF AMERICA A - is a large growth fund that seeks capital
           growth by investing  primarily in common stocks. The fund may invest
           up to 15% of assets in  securities of issuers  domiciled  outside of
           the United States and Canada.

           FIRST  EAGLE  OVERSEAS  FUND A - is a foreign  stock fund that seeks
           long-term capital growth by investing primarily in equities of small
           and mid-sized foreign companies in developed and emerging markets.

                                       6


                               NEXEN SAVINGS PLAN
                         NOTES TO FINANCIAL STATEMENTS


NOTE 2.   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CONTINUED

     INVESTMENTS - CONTINUED

           EUROPACIFIC  GROWTH FUND A - is a large  company  foreign stock fund
           that seeks long-term capital  appreciation by investing in companies
           domiciled in developed countries outside the United States.

           WASHINGTON   MUTUAL   INVESTORS   FUND  A  -  is  a  large   company
           value-oriented growth and income fund.

           OPPENHEIMER DEVELOPING MARKETS FUND A - is an emerging markets stock
           fund that seeks long-term  growth by investing in stock of issues in
           countries with developing markets.

           THIRD AVENUE VALUE FUND - is a small value fund that seeks long-term
           capital  appreciation  by investing in equity  securities  issued by
           companies  that are  believed to be  undervalued  and to have strong
           financial positions and responsible management.

           NEXEN INC.  STOCK FUND - provides  ownership  interest in Nexen Inc.
           Common Stock with short-term cash sufficient to maintain a liquidity
           balance  to  facilitate  daily   transactions  and  compliance  with
           securities law.

     MARKET AND CREDIT RISKS

         The Plan invests in a variety of investments.  Investments are exposed
         to various risks,  such as interest rate, market and credit risks. Due
         to the level of risk  associated  with certain  investments,  it is at
         least  reasonably  possible  that the  changes  in the  values  of the
         investments  will occur in the near term and that such  changes  could
         materially  affect the amount reported in the Plan's  statement of net
         assets available for benefits.

     ADMINISTRATION

         The Plan is administered  by the  Administrative  Committee,  which is
         composed  of  members  who are either  officers  or  employees  of the
         Company.  Investment  options for the Plan are selected by the Benefit
         Plan Design Committee from funds available  through the  Recordkeeper.
         Some of the fund providers  charge 12b-1 fees at the fund level before
         earnings are paid to investors.  The  Recordkeeper  receives fees from
         these fund providers from 12b-1 fees charged to the funds.  12b-1 fees
         received by the Recordkeeper are based on Plan assets invested in each
         fund. Similarly, all Trustee fees for the Plan are received from 12b-1
         fees charged to the funds. 12b-1 fees received by the Trustee are also
         based on Plan assets invested in each fund.


                                       7


                               NEXEN SAVINGS PLAN
                         NOTES TO FINANCIAL STATEMENTS


NOTE 2.   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CONTINUED

     LOANS TO PARTICIPANTS

         Participant  loans receivable are stated at cost,  which  approximates
         fair value. A Participant may borrow up to the lesser of 50% of his or
         her vested  account  balance or $50,000  with a minimum loan amount of
         $1,000.  Loans are repayable  through payroll  deductions over periods
         ranging up to 60 months.  Participants  are  charged a $50 loan set-up
         fee with a $2 monthly  maintenance fee per loan. The loans are secured
         by a lien on the  borrower's  vested  account  balance in the Plan and
         bear interest at rates based on prevailing market conditions. Interest
         rates on  outstanding  loans at December 31, 2006 ranged from 6.16% to
         9.13%.

     PLAN TERMINATION

         Although it has not  expressed any intention to do so, the Company has
         the right to terminate the Plan  pursuant to  provisions  set forth by
         the Plan Document and subject to the provisions of ERISA. In the event
         of Plan  termination,  each  Participant's  account shall become fully
         vested and  Participants  will be entitled to  distributions  of their
         entire accounts.


NOTE 3.   TAX STATUS

     The Plan  received a  favorable  determination  letter  from the  Internal
     Revenue  Service  dated  April  5,  2002,  stating  that  the Plan and its
     amendments are qualified under Section 401(a) of the Internal Revenue Code
     of 1986,  as amended (the  "Code"),  and the Trust is exempt from taxation
     under Section 501(a) of the Code. The Trust  established under the Plan to
     hold the Plan's assets is intended to qualify  pursuant to the appropriate
     section of the Internal  Revenue Code as a  tax-exempt  organization.  The
     plan has been amended since receiving the determination  letter.  However,
     the Company and the Plan's tax counsel believe that the Trust continues to
     qualify and to operate as designed.


                                       8


                               NEXEN SAVINGS PLAN
                         NOTES TO FINANCIAL STATEMENTS


NOTE 4.   INVESTMENTS

     Investments that represent 5% or more of the net assets available for Plan
     benefits at December 31, 2006 and 2005 are as follows:

                                               December 31,        December 31,
                                                      2006                2005
                                                Fair Value          Fair Value
                                                ----------          ----------

Bond Fund of America A                         $ 3,257,643         $ 3,150,948
EuroPacific Growth Fund A                        3,440,498           2,755,028
Nexen Inc. Stock Fund                           17,044,005          15,072,085
Stable Value Fund                                5,995,388           5,501,169
Third Avenue Value Fund                          2,772,459           2,518,717
Washington Mutual Investors Fund A               5,015,076           4,399,742
Growth Fund of America A                         3,197,142           2,608,119
American Century Real Estate                     2,914,279                   -


     During 2006 and 2005, the Plan's  investments  (including gains and losses
     on investments bought and sold, as well as held during the year) increased
     in value by $7,225,045 and $11,587,123, respectively, as follows:

                                 2006                          2005
                      ---------------------------   ---------------------------
                                     Realized and                  Realized and
                      Interest and     Unrealized   Interest and     Unrealized
                         Dividends          Gains      Dividends          Gains
                      ------------   ------------   ------------   ------------
Mutual funds          $  2,225,242   $  2,169,687   $  1,519,930   $  1,015,736
Stock funds                 55,371      2,708,928         53,924      8,930,520
Loans to Participants       65,817                        67,013



                                       9


                               NEXEN SAVINGS PLAN
                         NOTES TO FINANCIAL STATEMENTS


NOTE 5.   PLAN AMENDMENTS

     On March 8,  2005,  the  Fifth  Amendment  to the Nexen  Savings  Plan was
     executed  and  adopted  effective  March 28,  2005.  The  purpose  of this
     amendment was to change the Plan's cash-out distribution dollar limit from
     $5,000 to $1,000.

     On August 17,  2005,  the Sixth  Amendment  to the Nexen  Savings Plan was
     executed  and  adopted.  Effective  August 18,  2005,  Section XIII of the
     Adoption Agreement was amended to add Canexus U.S. Inc. as a Participating
     Employer covered under the Plan.

     On June 30,  2006,  the Seventh  Amendment  to the Nexen  Savings Plan was
     executed and adopted effective July 1, 2006. The purpose of this amendment
     was to change the Plan's cash-out distribution dollar limit from $1,000 to
     $5,000.

     On December 27, 2006,  the Eighth  Amendment to the Nexen Savings Plan was
     executed  and  adopted   effective   December  1,  2006.   The   amendment
     incorporates  the  provisions  of the Roth 401(k),  the final  regulations
     under  sections  401(k) and 401(m) of the  Internal  Revenue  Code,  and a
     provision  expanding  the  definition  of a financial  hardship to include
     certain  funeral  expenses  and  expenses  for the  repair of damage to an
     employee's principal residence.

     On December 29, 2006,  the Ninth  Amendment to the Nexen  Savings Plan was
     executed and  adopted.  Effective  December 29, 2006,  Section XIII of the
     Adoption  Agreement  was  amended  to  remove  Canexus  U.S.  Inc.,  Nexen
     Chemicals  U.S.A.  Inc, and Nexen Oil and Gas U.S.A.  Inc as participating
     employers under the plan.


NOTE 6.   SUBSEQUENT EVENT

     In early January 2007 the Plan transferred  assets totaling  $1,928,109 to
     the newly established Canexus U.S. Inc., Retirement Plan.



                                      10





                             SUPPLEMENTAL SCHEDULE







                               NEXEN SAVINGS PLAN
         SCHEDULE H, LINE 4I - SCHEDULE OF ASSETS (HELD AT END OF YEAR)
                                EIN: 06-0944810
                                PLAN NUMBER 001
                               DECEMBER 31, 2006



(a)         (b)                                       (c)                           (d)          (e)
                                       Description of Investment including
   Identity of Issuer, borrower         maturity date, rate of investment,                     Current
     lessor, or similar party           collateral, par, or maturity value         Cost #       Value
- -- ------------------------------      ------------------------------------       -------    -----------
                                                                                    
PARTICIPANT-DIRECTED INVESTMENTS:

   The American Funds Group            Bond Fund of America A,
                                         Net Asset Value $13.32                              $ 3,257,643

   The American Funds Group            Washington Mutual Investors Fund A,
                                         Net Asset Value $34.86                                5,015,076

   The American Funds Group            EuroPacific Growth Fund A,
                                         Net Asset Value $46.56                                3,440,498

   American Beacon                     American Beacon Small Cap Value Plan
                                         Net Asset Value $21.20                                1,168,980

   DWS Scudder Funds                   DWS Equity 500 Index Fund,
                                         Net Asset Value $158.94                               2,450,476

   First Eagle Funds                   First Eagle Overseas Fund A,
                                         Net Asset Value $25.08                                1,567,623

   Managers Funds                      Managers Special Equity Fund
                                         Net Asset Value $82.96                                1,604,712

   The American Funds Group            Growth Fund of America A,
                                         Net Asset Value $32.87                                3,197,142

   Third Avenue Funds                  Third Avenue Value Fund,
                                         Net Asset Value $59.46                                2,772,459

   American Century Investments        American Century Real Estate Investment Fund,
                                         Net Asset Value $30.36                                2,914,279

   Oppenheimer Funds                   Oppenheimer Developing Markets Fund A,
                                         Net Asset Value $41.21                                1,644,611

   The American Funds Group            Cash Management Trust Of America,
                                         Par Value $1.00                                         227,255

   Federated Capital Reserves          Federated Capital Reserves
                                         Par Value $1.00                                              52

   AMVESCAP National Trust Company     Stable Value Trust Fund,
                                         Par Value $1.00                                       5,995,388

   Chase Bank, NA                      Cash                                                    2,116,979

*  Nexen Inc.                          Nexen Inc. Stock Fund                                  17,044,005
                                         (Nexen Inc. Stock, no par,
                                         Net Asset Value $55.00)

*  Loans to Participants               Interest Rates From 6.16% to 9.13%                        788,945
                                                                                             -----------
                                                                                             $55,206,123
                                                                                             ===========


*  Indicates each identified person/entity known to be party-in-interest.

#  Historical   cost   information   omitted   as  it  is  not   required   for
   participant-directed investments.

   This  supplemental  schedule  lists assets held for  investment  purposes at
   December  31,  2006,  as required  by the  Department  of Labor's  Rules and
   Regulations for Reporting and Disclosure.


                                       11


                                   SIGNATURES

         THE PLAN.  Pursuant to the requirements of the Securities Exchange Act
of 1934, Nexen Petroleum  U.S.A.  Inc. has duly caused this annual report to be
signed on its behalf by the undersigned hereunto duly authorized.

DATED:  June 28, 2007

                                             NEXEN SAVINGS PLAN

                                             By:  Nexen Petroleum U.S.A. Inc.



                                             By:  /s/ Douglas B. Otten
                                                  ----------------------------
                                                  Douglas B. Otten, President






                               INDEX TO EXHIBITS


        EXHIBIT
        NUMBER                   DESCRIPTION OF EXHIBITS
        ------                   -----------------------

           1            Consent of Weaver & Tidwell, L.L.P.