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): March 12, 2007

                            ------------------------

                        PIONEER NATURAL RESOURCES COMPANY
             (Exact name of registrant as specified in its charter)


           Delaware                     1-13245                 75-2702753
       (State or other                (Commission            (I.R.S. Employer
jurisdiction of incorporation)        File Number)        Identification Number)

    5205 N. O'Connor Blvd                                         75039
          Suite 200                                             (Zip code)
        Irving, Texas
    (Address of principal
     executive offices)


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

                                 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))





Item 1.01. Entry into a Material Definitive Agreement

On March 12, 2007, Pioneer Natural Resources Company (the "Company")  executed a
seventh  supplemental  indenture  (the "Seventh  Supplemental  Indenture")  with
Pioneer Natural  Resources USA, Inc., The Bank of New York Trust Company,  N.A.,
as trustee (the "Original Trustee"), and Wells Fargo Bank, National Association,
as series  trustee  (the "Series  Trustee"),  under the  Indenture,  dated as of
January 13,  1998,  between the Company and the Original  Trustee,  as successor
trustee to The Bank of New York.

The Seventh Supplemental Indenture is attached as Exhibit 4.1, and the terms and
conditions thereof are incorporated herein by reference.

The Form of the  Company's  6.65% Senior  Notes due 2017 issued  pursuant to the
Seventh  Supplemental  Indenture  is attached as Exhibit  4.2, and the terms and
conditions thereof are incorporated herein by reference.




Item 9.01. Financial Statements and Exhibits

         (d)      Exhibits

                  4.1 -    Seventh Supplemental Indenture, dated as of March
                           12, 2007, among the Company, Pioneer Natural
                           Resources USA, Inc., The Bank of New York Trust
                           Company, N.A, as original trustee under the
                           indenture, and Wells Fargo Bank, National
                           Association, as series trustee, with respect to that
                           indenture, dated as of January 13, 1998, between the
                           Company and Bank of New York Trust Company, N.A., as
                           successor trustee to The Bank of New York.

                  4.2 -    Form of 6.65% Senior Notes due 2017 of the Company.




                                   SIGNATURES

   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


                                               /s/ Darin G. Holderness
                                               ---------------------------------
                                               Darin G. Holderness
                                               Vice President and Chief
                                               Accounting Officer
Dated: March 12, 2007





                                  EXHIBIT INDEX



    Exhibit
    Number                Exhibit Title


    4.1(a) -      Seventh Supplemental  Indenture, dated  as of  March 12, 2007,
                  among the Company, Pioneer  Natural Resources  USA,  Inc., The
                  Bank of New York Trust Company, N.A, as original trustee under
                  the indenture, and  Wells Fargo Bank, National Association, as
                  series  trustee, with  respect to  that indenture, dated as of
                  January  13, 1998,  between the  Company and  Bank of New York
                  Trust Company, N.A., as successor trustee  to The Bank  of New
                  York.

    4.2(a) -         Form of 6.65% Senior Notes due 2017 of the Company.
    ---------

    (a) Filed herewith.