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): January 26, 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 7.01. Regulation FD Disclosure.

     Pioneer  Natural  Resources  Company and its  subsidiary,  Pioneer  Natural
Resources USA, Inc.  (collectively,  the  "Company")  have reached a conditional
settlement  in the lawsuit,  MOSH  Holding,  L.P. v. Pioneer  Natural  Resources
Company;  Pioneer Natural  Resources USA, Inc.;  Woodside Energy (USA) Inc.; and
JPMorgan Chase Bank, NA, as Trustee of the Mesa Offshore Trust (the  "Lawsuit"),
which was filed on April 11, 2005 in the District Court of Travis County,  Texas
(250th  Judicial  District) and  subsequently  transferred to the 334th Judicial
District  of  Harris  County,   Texas  (the  "Court").   Dagger-Spine   Hedgehog
Corporation  filed a petition to  intervene  in the Lawsuit in  December,  2006.
(MOSH Holding and Dagger-Spine are referred to, collectively,  as "Plaintiffs").
Plaintiffs are unit holders in the Mesa Offshore Trust (the "Trust"), which owns
a 99.99% interest in the Mesa Offshore Royalty Partnership (the  "Partnership").
The Partnership was formed to hold certain  overriding  royalty interests in oil
and gas leases  offshore  Louisiana  and Texas.  The Company owns the  remaining
0.01% managing general partner interest in the Partnership. The Lawsuit relates,
generally,  to  the  transfer  of  certain  leasehold  rights  affected  by  the
overriding  royalty  interests of the  Partnership to Woodside Energy (USA) Inc.
("Woodside")  in connection  with  exploration  and  development of the offshore
areas covered by those royalty  interests,  and to the sale of the assets of the
Partnership  as required  under the Indenture for the Trust.  Plaintiffs  allege
that the Company, together with Woodside,  concealed and/or reduced the value of
the royalty  interests  and worked to  terminate  the Trust  prematurely  and to
capture for itself and  Woodside  profits  that belong to the Trust.  Plaintiffs
also allege breaches of fiduciary duty, misapplication of trust property, common
law fraud,  gross  negligence,  and breach of the  conveyance  agreement for the
overriding  royalty  interest.  The  claims  appear  to  relate  principally  to
arrangements  established in 2003 for two offshore  properties,  the Brazos Area
Block A-7 and Brazos Area Block A-39.

     The Trustee and the Company have reached a  conditional  settlement  of all
claims  in the  Lawsuit  that the  Trust or the  Partnership  has or might  have
against the Company.  Under the settlement,  the Company has agreed to assign to
the Partnership an interest confirming its right to a 4.5% cost-free  overriding
royalty  interest in the Brazos Area Block A-39 No. 5 Well until  payout of that
well,  and to assign to the  Partnership  an  interest  in the same well,  to be
effective  from and after  payout if payout  occurs,  equal to a 45% net profits
interest.  The Company has also agreed to pay for and satisfy approximately $1.4
million of plugging, abandonment, and decommissioning costs that would otherwise
be  allocated  to the  Partnership.  Finally,  the Company and the Trustee  have
agreed  that  the  Company  shall  arrange  for the  sale of all  assets  of the
Partnership  as  provided  for  under  the  Trust  Indenture  on,  or as soon as
practical  after,  July 1,  2007,  or on an  earlier  date as set  forth  in the
settlement.

     The  settlement  is not  expected  to have a material  effect on  Pioneer's
liquidity, financial condition or future results of operations.



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     The settlement is subject to certain conditions,  including approval of the
settlement by the Court.  The Plaintiffs  are not  signatories to the settlement
and they,  or other  unitholders  of the Trust,  may comment on or object to the
settlement.  The  settlement  is not final  until  approved by the Court and any
appeals are  resolved.  If the Court  approves the  settlement,  it will enter a
judgment that will dismiss the Lawsuit with  prejudice as to all claims that may
be  brought  on behalf of the Trust,  either by the  Trustee  or by  unitholders
seeking  to assert  claims on behalf of  themselves  or the Trust,  against  the
Company.








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                                   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: January 31, 2007






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