EXHIBIT 99.2

                          FIFTH SUPPLEMENTAL INDENTURE

     THIS  FIFTH  SUPPLEMENTAL  INDENTURE  dated  as  of  July  15,  2004  (this
"Supplemental  Indenture"),  among Pioneer Natural Resources Company, a Delaware
corporation  (the  "Company"),  Pioneer Natural  Resources USA, Inc., a Delaware
corporation,  for  purposes of agreeing to make certain  guarantees  pursuant to
Section 3 hereof (the "Guarantor"), and The Bank of New York, a New York banking
association,  as trustee (the "Trustee").  Capitalized terms used herein and not
otherwise  defined  have the  meanings  set forth in the  Indenture  referred to
below.

                                    RECITALS

     A. The Company and the Trustee are parties to that certain Indenture, dated
as of January 13, 1998 (the "Indenture"), pursuant to which the Company may from
time  to  time  issue  its  debentures,  notes,  bonds  or  other  evidences  of
indebtedness (collectively, the "Debt Securities").

     B. Article IX of the Indenture  provides that the Company,  when authorized
by a resolution  of the Board of Directors of the Company,  and the Trustee may,
without  the  consent  of the  holders  of the  Debt  Securities,  enter  into a
supplemental  indenture to establish the form or terms of Debt Securities of any
series as permitted by Sections 2.01 and 2.03 of the Indenture.

     C. The Company desires to issue,  and upon certain events specified in this
Supplemental  Indenture,  the  Guarantor  desires  to agree to be  obligated  to
guarantee,  $526,875,000  aggregate  principal amount of 5.875% Senior Notes Due
2016 (the  "Notes") and in connection  therewith,  the Company and the Guarantor
have  duly  determined  to  make,  execute  and  deliver  to  the  Trustee  this
Supplemental  Indenture  to set forth the terms and  provisions  of the Notes as
required by the Indenture.

     NOW, THEREFORE, in consideration of the mutual agreements and covenants set
forth  herein,  the parties  hereto agree,  subject to the terms and  conditions
hereinafter set forth, as follows for the benefit of the Trustee and the Holders
of the Notes:

     Section 1.     Notes.  Pursuant to Section 2.03 of the Indenture, the terms
and provisions of the Notes are as follows:

             (a)    The title of the Notes shall be "5.875% Senior Notes Due
2016."

             (b)    The  Notes  shall  be  initially  limited  to   $526,875,000
aggregate principal amount. The Company may, without the  consent of the Holders
of the Notes,  increase  such aggregate  principal amount in the future,  on the
same terms and conditions  and  with the  same CUSIP numbers  as the Notes.  The
Company shall  not issue any such  additional Notes  unless the additional Notes
are fungible with the Notes for United States federal income tax purposes.

             (c)    The  Notes  shall  not  require  any  principal  or  premium
payments prior to maturity on July 15, 2016.

             (d)    The  rate at  which the  Notes shall  bear interest shall be
5.875% per annum; interest on the notes shall accrue from July 15, 2004, for the
first  interest  payment  and  from  the  most   recent  interest  payment  date
thereafter; the interest payment dates on which  such interest  shall be payable
shall be  January 15 and  July 15,  beginning  January 15, 2005;  and the record
dates for the determination of the holders of the Notes to whom such interest is
payable shall be the  immediately preceding  January 1  (for January  15 payment
dates) and July 1  (for July 15 payment dates);  the rate  at which  the overdue
principal shall bear interest shall be 1% per annum in excess of the rate stated
initially in this clause; and the rate at which overdue installments of interest
shall bear interest shall be 1% per annum in excess of the rate stated initially
in this clause to the extent lawful.

             (e)    Payments  of  principal  of  and   interest  on  the   Notes
represented by one or more Global Senior  Notes initially registered in the name
of The Depository Trust Company  (the "Depositary")  or its nominee with respect
to the Notes  shall be  made by the  Company through the  Trustee in immediately
available funds to the Depositary or its nominee, as the case may be.


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             (f)    The Notes  shall be redeemable  at any time,  at the  option
of the Company,  in whole  or  from  time  to time  in part,  at the price,  and
otherwise in accordance with the terms and provisions, set forth in Section 2 of
this Supplemental Indenture and (to the extent they do not conflict with Section
2 of this Supplemental  Indenture) the terms and provisions of Sections 3.03 and
3.04 of the Indenture.

             (g)    The Notes  shall be represented by one or more Global Senior
Notes deposited with the Depositary and registered in the name of the nominee of
the Depositary.

             (h)    There shall be no mandatory sinking fund for the payments of
the Notes.

             (i)    As long  as the  Depositary or  its nominee,  or a successor
Depositary or its nominee,  is the registered owner  of the Global  Senior Notes
relating to the Notes,  owners of the beneficial interests in such Global Senior
Notes shall  not be  entitled to  have the  Notes registered  in their names and
shall  not receive  or be  entitled to  receive  physical  delivery  of Notes in
definitive form except  (i) as provided in  Section 2.15(c)  of the Indenture or
(ii)  if an Event  of Default  with respect  to the  Notes has  occurred and  is
continuing.

             (j)    The Bank of  New York  shall be  the Trustee  for the  Notes
under the Indenture.

             (k)    Article X of the Indenture shall apply to the Notes.

             (l)    The  Notes  shall  not  be  subordinated  pursuant  to   the
provisions of Article XII of the Indenture.  The Notes shall be senior unsecured
obligations of  the Company  ranking  pari passu with other existing  and future
senior unsecured indebtedness of the Company.

             (m)    The Company shall  be subject to all the covenants set forth
in Article IV of the Indenture with respect to the Notes.

             (n)    To the  extent  not set  forth  herein,  the  provisions  of
Section 2.03 of the Indenture are not applicable.

     Section 2. Optional  Redemption  of Notes.  The Notes will be redeemable at
any time,  at the option of the Company,  in whole or from time to time in part,
upon not less  than 30 and not more  than 60 days'  notice  as  provided  in the
Indenture,  on any date prior to  maturity  (the  "Redemption  Date") at a price
equal to 100% of the principal  amount thereof plus accrued and unpaid interest,
if any, to the Redemption Date (subject to the right of Holders of record on the
relevant record date to receive  interest due on any interest  payment date that
is on or prior to the Redemption  Date) plus a Make-Whole  Premium,  if any (the
"Redemption  Price"). In no event will a Redemption Price ever be less than 100%
of the principal amount of the Notes plus accrued and unpaid  interest,  if any,
to the Redemption Date.

     The amount of the  Make-Whole  Premium with respect to any of the Notes (or
portion thereof) to be redeemed will be equal to the excess, if any, of:

             (a)    the  sum  of  the  present  values,  calculated  as  of  the
Redemption Date, of:

                    (i)    each interest payment that,  but for such redemption,
         would have  been  payable on  such  Note  (or  portion  thereof)  being
         redeemed  on each  interest payment date occurring after the Redemption
         Date  (excluding  any  accrued  interest  for the  period  prior to the
         Redemption Date); and

                    (ii)   the principal  amount that,  but for such redemption,
         would have been payable at the final maturity of such  Note (or portion
         thereof) being redeemed; over

             (b)    the principal amount of such Note (or portion thereof) being
redeemed.

     The present values of interest and principal payments referred to in clause
(a) above will be determined in accordance with generally accepted principles of
financial  analysis.  Such present values will be calculated by discounting  the
amount of each  payment of  interest or  principal  from the date that each such
payment would have been payable, but for the redemption,  to the Redemption Date
at a discount rate equal to the Treasury  Yield (as defined below) plus 20 basis
points.


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     The  Make-Whole  Premium will be  calculated by an  independent  investment
banking institution of national standing appointed by the Company; provided that
if the Company fails to make such appointment at least 45 business days prior to
the Redemption  Date, or if the  institution so appointed is unwilling or unable
to make  such  calculation,  such  calculation  will  be made by an  independent
investment banking institution of national standing appointed by the Trustee (in
any such case, an "Independent Investment Banker").

     For purposes of determining the Make-Whole Premium,  "Treasury Yield" means
a rate of interest  per annum equal to the weekly  average  yield to maturity of
United States Treasury Notes that have a constant  maturity that  corresponds to
the  remaining  term to  maturity of the  applicable  Notes,  calculated  to the
nearest  1/12th of a year (the  "Remaining  Term").  The Treasury  Yield will be
determined as of the third  business day  immediately  preceding the  applicable
Redemption Date.

     The  weekly  average  yields  of  United  States  Treasury  Notes  will  be
determined by reference to the most recent statistical  release published by the
Federal  Reserve Bank of New York and designated  "H.15 (519) Selected  Interest
Rates" or any successor  release (the "H.15 Statistical  Release").  If the H.15
Statistical Release sets forth a weekly average yield for United States Treasury
Notes having a constant  maturity that is the same as the Remaining  Term,  then
the  Treasury  Yield will be equal to such weekly  average  yield.  In all other
cases,   the  Treasury  Yield  will  be  calculated  by   interpolation,   on  a
straight-line  basis,  between the weekly  average  yields on the United  States
Treasury  Notes that have a constant  maturity  closest to and greater  than the
Remaining  Term and the  United  States  Treasury  Notes  that  have a  constant
maturity  closest to and less than the Remaining Term (in each case as set forth
in the H.15  Statistical  Release).  Any weekly  average yields so calculated by
interpolation  will be rounded to the nearest  1/100th of 1%, with any figure of
1/200th of 1% or above being rounded upward. If weekly average yields for United
States  Treasury  Notes are not  available  in the H.15  Statistical  Release or
otherwise,  then the  Treasury  Yield will be  calculated  by  interpolation  of
comparable rates selected by the Independent Investment Banker.

     In  the  case  of any  partial  redemption,  selection  of  the  Notes  for
redemption  will be made by the Trustee on a pro rata  basis,  by lot or by such
other  method as the  Trustee in its sole  discretion  shall deem to be fair and
appropriate,  although  no such Note of $1,000 in original  principal  amount or
less shall be redeemed in part. If any Note is to be redeemed in part only,  the
notice of  redemption  relating  to such Note  shall  state the  portion  of the
principal amount thereof to be redeemed. A new Note in principal amount equal to
the unredeemed  portion thereof will be issued in the name of the Holder thereof
upon cancellation of the original Note.

     Section 3.  Obligation  to  Guarantee.  If at any time any of the Company's
6.50% Senior Notes due 2008,  9-5/8%  Senior Notes due 2010,  7.50% Senior Notes
due 2012 (the "7.50%  Notes") or 7.20% Senior Notes due 2028 (all of such senior
notes,  collectively,  the "Other Senior Notes") are guaranteed by the Guarantor
pursuant to the terms of the Indenture or any applicable  supplemental indenture
related to such senior  notes,  then the Company,  the Guarantor and the Trustee
shall  as soon as  reasonably  practicable  thereafter  execute  and  deliver  a
supplemental  indenture to the Indenture  pursuant to which the Guarantor  shall
unconditionally  guarantee  the  Notes on  substantially  the same  terms as the
Guarantor shall have guaranteed the 7.50% Notes; provided,  however, that if the
Guarantor is not required to guarantee the 7.50% Notes or if the 7.50% Notes are
no  longer  outstanding,  then  the  Guarantor  shall  guarantee  the  Notes  on
substantially  the same terms as the most recently issued series of Other Senior
Notes that are  guaranteed.  The Company,  the  Guarantor  and the  Trustee,  as
applicable, also shall execute and deliver such other documents,  instruments or
certificates  as are reasonably  necessary or appropriate to effect the required
guarantee of the Notes.

     Section 4.     Amendments to Sections 1.01, 2.07 and 2.15 and Article IV.
                    ---------------------------------------------------------

             (a)    Section 1.01.  Section 1.01  is hereby amended,  solely with
respect to the Notes, by:

                    (i)    deleting  clause  (a)(iv)(A)  of  the  definition  of
         "Adjusted Consolidated  Net Tangible Assets"  and substituting therefor
         the following  language "the net book value of other tangible assets of
         the Company and its Subsidiaries, as of a date no earlier than the date
         of the Company's  latest annual or quarterly financial statement, and";
         deleting   the  following  language  "Issue  Date  (including,  without
         limitation,  under the  Credit Agreements)" at the end of clause (e) of
         the  definition of  "Permitted Liens"  and  substituting  therefor  the
         following language "date  on which the 5.875% Senior  Notes due 2016 of
         the Company were originally issued"; adding the following language "and
         Liens securing  Non-Recourse Indebtedness;  provided, however, that the
         related purchase money  Indebtedness and Non-Recourse Indebtedness,  as
         applicable,  shall not  be secured  by any  Property or  assets of  the
         company or any Restricted Subsidiary  other than the Property  acquired
         by the Company with the proceeds of such purchase money Indebtedness or
         Non- Recourse Indebtedness, as applicable" after "Purchase Money Liens"
         in clause (i) of the definition of "Permitted Liens";

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                    (ii)   deleting the  definition of  "Credit  Agreements" and
         substituting therefor the definition "Credit Facility" as follows:

                  "Credit Facility"  means,  with  respect to the  Company,  the
                  credit facility made available to  the Company pursuant to the
                  Credit Agreement  dated as  of  December 16,  2003,  among the
                  Company and  the  lenders  named  therein,  together  with any
                  Refinancings thereof by a lender or a syndicate of lenders. It
                  is understood  and  agreed  that the  Credit  Facility  may be
                  refinanced,  refunded,  extended, renewed or replaced (through
                  one  or   more  such   refinancings,  refundings,  extensions,
                  renewals or replacements), as a whole,  or in part,  from time
                  to  time  after  the  termination  of  the  applicable  Credit
                  Facility."; and

                    (iii)  adding a definition of "Refinance" as follows:

                  "Refinance"  means,   in  respect  of  any  Indebtedness,   to
                  refinance,  extend,  renew,  refund,  repay,  prepay,  redeem,
                  defease or retire, or to  issue other Indebtedness in exchange
                  or  replacement  for,  such  indebtedness.   "Refinanced"  and
                  "Refinancing" shall have correlative meanings.

     Section 5. Ratification.  This Supplemental Indenture is executed and shall
be construed as an indenture  supplemental  to the Indenture and, as provided in
the Indenture, this Supplemental Indenture forms a part of the Indenture. Except
to the extent amended by or supplemented  by this  Supplemental  Indenture,  the
Company,  the Guarantor and the Trustee hereby ratify,  confirm and reaffirm the
Indenture in all respects.

     Section 6. Counterparts. This Supplemental Indenture may be executed in any
number of counterparts,  each of which so executed shall be an original, but all
such counterparts shall together constitute but one and the same instrument.

     Section 7.  Governing  Law.  The laws of the State of New York shall govern
the construction and  interpretation  of this  Supplemental  Indenture,  without
regard to principles of conflicts of laws.

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     IN WITNESS  WHEREOF,  the parties  hereto  have  caused  this  Supplemental
Indenture to be signed on their behalf by their duly authorized  representatives
as of the date first above written:

                          Pioneer Natural Resources Company

                          By:      /s/ Richard P. Dealy
                               ------------------------------------------------
                          Name:    Richard P. Dealy
                          Title:   Vice President and Chief Accounting Officer


                          Pioneer Natural Resources USA, Inc.


                          By:      /s/ Richard P. Dealy
                               ------------------------------------------------
                          Name:    Richard P. Dealy
                          Title:   Vice President and Chief Accounting Officer


                          The Bank of New York, as Trustee

                          By:      /s/ Remo J. Reale
                               ------------------------------------------------
                          Name:    Remo J. Reale
                          Title:   Vice President



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