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


                                    FORM 8-K


                             CURRENT REPORT PURSUANT
                          TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

      Date of report (Date of earliest event reported)    July 18, 2007


                                   NEXEN INC.
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             (Exact Name of Registrant as Specified in Its Charter)


                                     CANADA
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                 (State or Other Jurisdiction of Incorporation)


                  1-6702                                 98-6000202
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         (Commission File Number)             (IRS Employer Identification No.)


             801 - 7TH AVENUE S.W.
           CALGARY, ALBERTA, CANADA                              T2P 3P7
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     (Address of Principal Executive Offices)                   (Zip Code)


                                 (403) 699-4000
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              (Registrant's Telephone Number, Including Area Code)


                                 NOT APPLICABLE
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          (Former Name or Former Address, if Changed Since Last Report)

     Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions (SEE General Instruction A.2. below):

     [_] Written communications pursuant to Rule 425 under the Securities Act
(17 CFR 230.425)

     [_] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17
CFR 240.14a-12)

     [_] Pre-commencement communications pursuant to Rule 14d-2(b) under the
Exchange Act (17 CFR 240.14d-2(b))

     [_] Pre-commencement communications pursuant to Rule 13e-4(c) under the
Exchange Act (17 CFR 240.13e-4(c))

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ITEM 5.02.    DEPARTURE  OF  DIRECTORS   OR  CERTAIN   OFFICERS;   ELECTION  OF
DIRECTORS;  APPOINTMENT OF CERTAIN  OFFICERS;  COMPENSATORY  ARRANGEMENTS  WITH
CERTAIN OFFICERS

         On July  11,  2007,  the  Company  entered  into a Change  of  Control
Agreement  (the  "Change  of  Control  Agreement")  with  Brendon  Muller,  the
Controller and principal accounting officer of the Company. Under the Change of
Control Agreement, in the event of a change of control resulting in termination
of Mr. Muller's employment (a) by the Company for reasons other than just cause
(as defined in the Change of Control Agreement), death, or disability or (b) by
Mr. Muller for good reason (as defined in the Change of Control Agreement),  in
each case within  twelve  months of the change of control,  Mr. Muller would be
entitled to receive, among other things, salary and benefits for a period of 24
months following termination.

         If Mr. Muller's employment is terminated by the Company for just cause
(as defined in the Change of Control Agreement) or by Mr. Muller other than for
good reason (as defined in the Change of Control Agreement)  following a change
of control,  the Change of Control  Agreement would  terminate  without further
obligation of the Company,  except that the Company would pay to Mr. Muller all
accrued but unpaid  salary or  benefits,  if any. In the event of Mr.  Muller's
death or disability,  the Change of Control  Agreement would terminate  without
further  obligation  of the Company,  except that the Company  would pay to Mr.
Muller or his estate all  accrued  but unpaid  salary or  benefits,  if any, in
addition to any death or disability  benefits in a manner consistent with those
provided  by the Company to senior  executives  under any plans,  programs,  or
policies in effect at the time of death or disability.

         A "change of control" for purposes of the Change of Control  Agreement
includes  (a) any  acquisition  of  common  shares or other  securities  of the
Company  carrying the right to cast more than 35% of the votes attaching to all
common  shares,  (b) the  liquidation  of or sale of  substantially  all of the
assets of the Company,  (c) any situation resulting in a change of the majority
of the Company's board of directors,  and (d) a determination  by the Company's
board of directors that a change of control has occurred or is imminent.

         The Change of Control  Agreement  expires 12 months following a change
of control. The Change of Control Agreement contains confidentiality provisions
that  require  Mr.  Muller not to  disclose  or use to his  personal  advantage
certain Company information.





                                   SIGNATURE

         Pursuant to the  requirements of the Securities  Exchange Act of 1934,
the  registrant  has duly  caused  this  report on Form 8-K to be signed on its
behalf by the undersigned, thereunto duly authorized.


Dated: July 18, 2007

                                            NEXEN INC.


                                            By: /s/ Rick Beingessner
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                                            Name:   Rick Beingessner
                                            Title:  Assistant Secretary