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                                                                    EXHIBIT 32.2
                                                                    ------------

CERTIFICATION OF PERIODIC REPORT

I, Kevin J. Reinhart, Senior Vice President and Chief Financial Officer of Nexen
Inc., a Canadian  Corporation  (the  "Company")  certify,  pursuant to 18 U.S.C.
Section  1350 as adopted  pursuant to Section 906 of the  Sarbanes-Oxley  Act of
2002, that:

(1)   the Quarterly  Report on Form 10-Q of the Company for the quarterly period
      ended  September  30,  2009 as filed  with  the  Securities  and  Exchange
      Commission  on the date  hereof (the  "Report")  fully  complies  with the
      requirements  of Section 13(a) or 15(d) of the Securities  Exchange Act of
      1934 (15 U.S.C. 78m or 78o(d)); and

(2)   the information  contained in the Report fairly presents,  in all material
      respects,  the  financial  condition  and  results  of  operations  of the
      Company.



Date:  November 3, 2009

                                        /s/ Kevin J. Reinhart
                                        ---------------------
                                        Kevin J. Reinhart
                                        Senior Vice President
                                        and Chief Financial Officer


A signed  original of this  written  statement  required by Section 906 has been
provided to Nexen Inc. and shall be retained by Nexen Inc. and  furnished to the
Securities and Exchange Commission or its staff upon request.