EXHIBIT 23.3
                                                                   ------------


             [LETTERHEAD OF MCDANIEL & ASSOCIATES CONSULTANTS LTD.]



May 1, 2007

NEXEN INC.
801 - 7th Avenue S.W.
Calgary, Alberta
T2P 3P7

CONSENT OF INDEPENDENT RESERVES EVALUATOR AND/OR AUDITOR

RE:      REGISTRATION STATEMENT ON FORM F-10 (FILE NO. 333-125019)
         (THE "REGISTRATION STATEMENT") OF NEXEN, INC. (THE "CORPORATION")

We refer to the  Registration  Statement  filed by the  Corporation  under  the
Securities  Act of 1933,  as amended.  We are a firm of  independent  petroleum
consultants of Calgary,  Alberta having  prepared  reports for the  Corporation
evaluating the Corporation's  reserves as at December 31, 2006, as described in
the Revised Annual  Information Form ("AIF") of the Corporation  dated April 2,
2007.

We hereby  consent to the use of and  reference  to our name under the  heading
"Experts" in the Registration Statement and to all other references to our firm
and the  inclusion  of  information  derived  from our reports in: (i) the AIF,
which is  incorporated  by reference in the  Registration  Statement;  (ii) the
annual report of the Corporation on Form 10-K as filed with the U.S. Securities
and  Exchange  Commission  (the "SEC") on  February  26, 2007 as amended by the
amended annual report of the  Corporation on Form 10-K as filed with the SEC on
April 2, 2007 (as  amended,  the  "Form  10-K");  and  (iii)  the  Registration
Statement.

Sincerely,

MCDANIEL & ASSOCIATES CONSULTANTS LTD.


/s/  P. A. Welch
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P. A. Welch, P. Eng.
President & Managing Director

Calgary, Alberta
May 1, 2007