POWER OF ATTORNEY
For Executing Forms 3, 4 and 5

	Know all by these presents, that the undersigned hereby constitutes
and appoints each of Mark S. Berg, Larry N. Paulsen, Darin G. Holderness
and Mark H. Kleinman, signing singly, the undersigned's true and lawful
attorney-in-fact to:

(1)	execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer and/or director of Pioneer Natural Resources Company
(the "Company"), Forms 3, 4 and 5 (including amendments thereto) in
accordance with Section 16(a) of the Securities Exchange Act of 1934 and
the rules thereunder;

(2)	do and perform any and all acts for and on behalf of the undersigned
that may be necessary or desirable to complete and execute any such Form 3,
4 or 5 (including amendments thereto) and timely file that Form with the
Securities and Exchange Commission and any stock exchange, self-regulatory
association or any other authority; and

(3)	take any other action of any type whatsoever in connection with the
foregoing that, in the opinion of each such attorney-in-fact, may be of
benefit to, in the best interest of, or legally required of the
undersigned, it being understood that the documents executed by the
attorney-in-fact on behalf of the undersigned pursuant to this Power of
Attorney shall be in such form and shall contain such terms and conditions
as the attorney-in-fact may approve in the attorney-in-fact's discretion.

	The undersigned hereby grants to each such attorney-in-fact full
power and authority to do and perform all and every act and thing
whatsoever requisite, necessary or proper to be done in the exercise of any
of the rights and powers herein granted, as fully to all intents and
purposes as the undersigned might or could do if personally present, with
full power of substitution or revocation, hereby ratifying and confirming
all that the attorney-in-fact, or the attorney-in-fact's substitute or
substitutes, shall lawfully do or cause to be done by virtue of this Power
of Attorney and the rights and powers herein granted. The undersigned
acknowledges that the foregoing attorneys-in-fact, and their substitutes, in
serving in such capacity at the request of the undersigned, are not
assuming (nor is the Company assuming) any of the undersigned's
responsibilities to comply with Section 16 of the Securities Exchange Act
of 1934.

	The undersigned agrees that each such attorney-in-fact may rely
entirely on information furnished orally or in writing by the undersigned
to the attorney-in-fact. The undersigned also agrees to indemnify and hold
harmless the Company and each such attorney-in-fact against any losses,
claims, damages or liabilities (or actions in these respects) that arise
out of or are based upon any untrue statements or omissions of necessary
facts in the information provided by the undersigned to such attorney-in
fact for purposes of executing, acknowledging, delivering or filing Form 3,
4 or 5 (including amendments thereto) and agrees to reimburse the Company
and the attorney-in-fact on demand for any legal or other expenses
reasonably incurred in connection with investigating or defending against
any such loss, claim, damage, liability or action.

	This Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file Forms 3, 4 and 5 with respect
to the undersigned's holdings of and transactions in securities issued by
the Company, unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact.

	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of the date written below.

/s/ Danny L. Kellum
Danny L. Kellum
July 27, 2005