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): May 15, 2005




                        Pioneer Natural Resources Company
             ------------------------------------------------------
             (Exact name of Registrant as specified in its charter)



          Delaware                     1-13245               75-2702753
----------------------------         ------------        -------------------
(State or other jurisdiction         (Commission          (I.R.S. Employer
      of incorporation)              File Number)        Identification No.)



5205 N. O'Connor Blvd., Suite 900, Irving, Texas               75039
------------------------------------------------            ----------
   (Address of principal executive offices)                 (Zip Code)


                                 (972) 444-9001
              ----------------------------------------------------
              (Registrant's telephone number, including area code)



                                 Not applicable
          -------------------------------------------------------------
          (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:

| | 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))








                        PIONEER NATURAL RESOURCES COMPANY

                                TABLE OF CONTENTS


                                                                      Page

Item 7.01.  Regulation FD Disclosure.............................      3

Item 9.01.  Financial Statements and Exhibits

            (c)   Exhibits.......................................      3

Signature........................................................      4

Exhibit Index....................................................      5




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                        PIONEER NATURAL RESOURCES COMPANY


Item 7.01.   Regulation FD Disclosure

     On May 17, 2005, Pioneer Natural Resources Company (the "Company") issued a
news release that is attached  hereto as exhibit 99.1. In the news release,  the
Company  announced  that on May 15, a mechanical  failure  occurred in the inlet
area of the Fain Gas Plant resulting in a fire.

Item 9.01.   Financial Statements and Exhibits

       (c)   Exhibits

             99.1   News Release dated May 17, 2005.



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                        PIONEER NATURAL RESOURCES COMPANY

                                S I G N A T U R E

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                             PIONEER NATURAL RESOURCES COMPANY




Date:  May 17, 2005          By:    /s/ Darin G. Holderness
                                   --------------------------------------------
                                   Darin G. Holderness
                                   Vice President and Chief Accounting Officer




                                       4








                        PIONEER NATURAL RESOURCES COMPANY

                                  EXHIBIT INDEX


Exhibit No.       Description
-----------       -----------

   99.1(a)        News Release dated May 17, 2005.


-------------
(a) filed herewith



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