PIONEER NATURAL RESOURCES CO
11-K, 1998-06-26
CRUDE PETROLEUM & NATURAL GAS
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      As filed with the Securities and Exchange Commission on June 26, 1998


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 11-K

      / x /       ANNUAL REPORT PURSUANT TO SECTION 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                   For the fiscal year ended December 31, 1997

                                       OR

      /   /     TRANSITION REPORT PURSUANT TO SECTION 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                  For the transition period from _____ to _____

                         Commission File No. 333-39249

A.    Full title of the plan and the address of the plan, if different from that
of the issuer named below:

                 PIONEER NATURAL RESOURCES USA, INC. 401(K) PLAN

B.    Name of issuer of the securities held pursuant to the plan and the address
of its principal executive officer:

                        Pioneer Natural Resources Company
                          5205 North O'Connor Boulevard
                            1400 Williams Square West
                               Irving, Texas 75039





<PAGE>




                       PIONEER NATURAL RESOURCES USA, INC.
                                   401(k) PLAN


                 Financial Statements and Supplemental Schedules

                           December 31, 1997 and 1996

                   (With Independent Auditors' Report Thereon)



<PAGE>






                          Independent Auditors' Report

To the Participants and Administrator
   of Pioneer Natural Resources USA, Inc.
   401(k) Plan:

We have audited the accompanying statements of net assets available for benefits
of Pioneer  Natural  Resources USA, Inc. 401(k) Plan (the "Plan") as of December
31, 1997 and 1996, and the related statements of changes in net assets available
for  benefits  for the years then  ended.  These  financial  statements  are the
responsibility  of the Plan's  management.  Our  responsibility is to express an
opinion on these financial statements based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial  statements,  referred to above present fairly, in
all material  respects,  the net assets available for benefits of the Plan as of
December 31, 1997 and 1996, and the changes in net assets available for benefits
for the years  then  ended in  conformity  with  generally  accepted  accounting
principles.

Our  audits of the Plan's  financial  statements  as of and for the years  ended
December  31,  1997 and 1996 were made for the  purpose of forming an opinion on
the financial statements taken as a whole. The supplemental schedules,  Item 27a
- - Schedule of Assets Held for  Investment  Purposes as of December  31, 1997 and
Item 27d - Schedule of Reportable  Transactions  for the year ended December 31,
1997 are presented for the purpose of additional analysis and are not a required
part  of the  basic  financial  statements,  but are  supplementary  information
required by the  Department of Labor's Rules and  Regulations  for Reporting and
Disclosure under the Employee  Retirement  Income Security Act of 1974. The Fund
Information in the statements of changes in net assets available for benefits is
presented for purposes of additional analysis rather than to present the changes
in net  assets  available  for plan  benefits  of each  fund.  The  supplemental
schedules and Fund  Information  have been subjected to the auditing  procedures
applied  in the audits of the basic  financial  statements  for the years  ended
December  31,  1997 and 1996  and,  in our  opinion,  are  fairly  stated in all
material  respects  in  relation to the basic  financial  statements  taken as a
whole.


                                                  KPMG Peat Marwick LLP
Midland, Texas
June 12, 1998
                                        3

<PAGE>



                       PIONEER NATURAL RESOURCES USA, INC.
                                   401(k) PLAN

                 Statements of Net Assets Available for Benefits

                           December 31, 1997 and 1996

                                                         1997           1996
                                                     -----------    -----------
ASSETS
   Investments at fair value (Note 3):
     Vanguard Money Market Reserves - Prime
        Portfolio - 6,920,007 shares in 1997
        and 1,676,031 shares in 1996 (cost
        approximates fair value)                     $ 6,920,007    $ 1,676,031

     Mutual Funds:
        Vanguard Fixed Income Fund - ST Corporate
           Portfolio - 512,013 shares in 1997 and
           151,446 shares in 1996 (cost $5,516,188
           and $1,618,677, respectively)               5,536,114      1,675,599
        Vanguard Index Trust 500 Portfolio - 40,837
           shares in 1997 and 30,377 shares in 1996
           (cost $2,872,952 and $1,940,961,
           respectively)                               3,680,362      2,176,174
        Vanguard Primecap Fund - 156,311 shares in
           1997 and 126,396 shares in 1996 (cost
           $4,845,166 and $3,602,651, respectively)    6,188,725      3,930,332
        Vanguard Windsor II - 254,464 shares in 1997
           and 215,791 shares in 1996 (cost
           $6,128,990 and $4,899,500, respectively)    7,286,947      5,288,299
        Vanguard International Growth Portfolio -
           22,235 shares in 1997 and 7,111 shares
           in 1996 (cost $380,071 and $117,240,
           respectively)                                 364,755        131,204
        Sarofim Equity Fund - 916,548 shares in 1997
           (cost $35,277,286)                         35,727,154             -
                                                      ----------     ----------
                                                      58,784,057     13,201,608
     Pioneer Natural Resources Stable Value Fund
        (cost approximates fair value)                 3,178,713      3,795,294
     Pioneer Natural Resources Stock Fund - 94,711
        shares in 1997 and 66,622 shares in 1996
        (cost $2,415,438 and $1,457,572,
        respectively)                                  2,740,713      2,463,044
     Participants' loans (unpaid principal balance
        approximates fair value)                       1,538,357        893,759
                                                      ----------     ----------
        Net assets available for benefits            $73,161,847    $22,029,736
                                                     ===========    ===========

See accompanying notes to financial statements.

                                        4

<PAGE>


<TABLE>
<CAPTION>


                                                PIONEER NATURAL RESOURCES USA, INC.
                                                            401(k) PLAN

                               Statement of Changes in Net Assets Available for Benefits (continued)
                                                For the year ended December 31, 1997

                                                                          Mutual Funds
                                             ---------------------------------------------------------------------------
                                              Vanguard                                                                   
                                            Fixed Income  Vanguard                               Vanguard                
                                  VMMR       Fund - ST      Index       Vanguard              International   Sarofim    
                                  Prime      Corporate    Trust 500     Primecap     Vanguard     Growth       Equity    
                                Portfolio    Portfolio    Portfolio       Fund      Windsor II   Portfolio      Fund     
                                ----------   ----------   ----------   ----------   ----------   ---------   ----------- 
<S>                             <C>          <C>          <C>          <C>          <C>          <C>         <C>         
Additions to net assets
 attributed to:
   Investment income            $  125,057   $  176,827   $   84,758   $  222,360   $  659,604   $  15,336   $     8,005 
   Employer contributions          101,571       58,668      100,489      153,602      180,227      21,276           -   
   Employee contributions          451,351      284,119      542,391      635,781      755,218     131,538       241,281 
   Transfers from other plans    4,728,468    3,528,089          -            -            -           -      35,419,100 
   Loan payments                    81,688       40,610       62,120      128,600      141,128       4,152           750 
   Net appreciation in fair value
      of investments                   -         11,267      728,875    1,260,371    1,085,522         -         450,231 
                                 ---------    ---------    ---------    ---------    ---------    --------   ----------- 
         Total additions         5,488,135    4,099,580    1,518,633    2,400,714    2,821,699     172,302    36,119,367 
                                 ---------    ---------    ---------    ---------    ---------    --------   ----------- 
Deductions from net assets
 attributed to:
   Employee loans                   76,577       71,653      103,343      169,886      188,334        7,761      333,687 
   Distributions to participants   276,375       80,913      104,683      176,923      373,691       13,112          -   
   Other deductions                    860          540          -             40          300           40          -   
   Net depreciation in fair value
      of investments                   -            -            -            -            -         13,464          -   
                                 ---------    ---------    ---------    ---------     --------     --------    --------- 
         Total deductions          353,812      153,106      208,026      346,849      562,325       34,377      333,687 
                                 ---------    ---------    ---------    ---------     --------     --------    --------- 
          Net increase (decrease)
            prior to interfund
            transfers            5,134,323    3,946,474    1,310,607    2,053,865    2,259,374      137,925   35,785,680 

Interfund transfers                109,653      (85,959)     193,581      204,528     (260,726)      95,626      (58,526)
                                 ---------   ----------    ---------    ---------     --------     --------   ---------- 
         Net increase (decrease) 5,243,976    3,860,515    1,504,188    2,258,393    1,998,648      233,551   35,727,154 

Net assets available for
 benefits:
   Beginning of year             1,676,031    1,675,599    2,176,174    3,930,332    5,288,299     131,204           -   
                                 ---------    ---------    ---------    ---------    ---------    --------    ---------- 
   End of year                  $6,920,007   $5,536,114   $3,680,362   $6,188,725   $7,286,947   $  364,755  $35,727,154 
                                 =========    =========    =========    =========    =========    =========   ========== 

See accompanying notes to financial statements.
</TABLE>
                                                                 5a

<PAGE>


<TABLE>
<CAPTION>

                                                PIONEER NATURAL RESOURCES USA, INC.
                                                            401(k) PLAN

                                     Statement of Changes in Net Assets Available for Benefits
                                                For the year ended December 31, 1997

                                 
                                 
                                    Pioneer       Pioneer
                                    Natural       Natural
                                   Resources     Resources   Participant
                                     Stable        Stock        Loans
                                   Value Fund      Fund      Receivable      Total
                                   ----------   ----------   -----------   ----------
<S>                                <C>          <C>          <C>           <C>
Additions to net assets
 attributed to:
   Investment income               $  239,065   $    8,529   $    99,402  $ 1,638,943
   Employer contributions                 -        629,404           -      1,245,237
   Employee contributions                 -         22,228           -      3,063,907
   Transfers from other plans             -            -             -     43,675,657
   Loan payments                          -             52      (459,100)         -
   Net appreciation in fair value
      of investments                      -            -             -      3,536,266
                                    ---------    ---------    ----------   ----------
         Total additions              239,065      660,213      (359,698)  53,160,010
                                    ---------    ---------    ----------   ----------
Deductions from net assets
 attributed to:
   Employee loans                      88,875          889    (1,041,005)         -
   Distributions to participants      238,428      108,770        36,709    1,409,604
   Other deductions                       -            -             -          1,780
   Net depreciation in fair value
      of investments                      -        603,051           -        616,515
                                    ---------    ---------    ----------   ----------
         Total deductions             327,303      712,710    (1,004,296)   2,027,899
                                    ---------    ---------    ----------   ----------
          Net increase (decrease)
            prior to interfund
            transfers                 (88,238)     (52,497)      644,598   51,132,111

Interfund transfers                  (528,343)     330,166           -            -
                                    ---------    ---------    ----------   ----------
         Net increase (decrease)     (616,581)     277,669       644,598   51,132,111

Net assets available for
 benefits:
   Beginning of year                3,795,294    2,463,044       893,759   22,029,736
                                    ---------    ---------    ----------   ----------
   End of year                     $3,178,713   $2,740,713   $ 1,538,357  $73,161,847
                                    =========    =========    ==========   ==========

See accompanying notes to financial statements.
                                                                 5b
</TABLE>

<PAGE>



<TABLE>
<CAPTION>

                                               PIONEER NATURAL RESOURCES USA, INC.
                                                           401(k) PLAN

                                    Statement of Changes in Net Assets Available for Benefits
                                               For the year ended December 31, 1996

                                                                   Texas Commerce Bank, N.A.
                              -----------------------------------------------------------------------------------------------------
                                                         Mutual Funds
                                           -------------------------------------                            Participant   Cash
                                 Money        Stock      Balanced      Growth     Investment   Securities     Loans      and Cash
                              Market Fund     Fund         Fund         Fund       Contracts      Fund      Receivable  Equivalents
                              -----------  -----------  -----------  -----------  -----------  -----------  ----------  -----------
<S>                           <C>          <C>          <C>          <C>          <C>          <C>          <C>         <C>
Additions to net assets
 attributed to:
  Investment income (expense) $    36,179  $    43,875  $    83,248  $     2,335  $   157,388  $     3,114   $  11,388  $       147
  Employer contributions           18,208      109,595       78,103       87,166       52,290      172,737         -            -
  Employee contributions           45,912      294,149      212,287      234,812      133,846          -           -            -
  Transfers from other plans        7,024        4,628        5,714        4,514        2,789          -      (123,012)         -
  Loan payments                     2,332       12,332       10,839       16,463       11,411          -       (53,377)         -
  Net appreciation in fair
    value of investments              -        204,947       44,219      228,033          -        368,089         -            -
                               ----------   ----------   ----------   ----------   ----------   ----------    --------   ----------
      Total additions             109,655      669,526      434,410      573,323      357,724      543,940     165,001)        147
                               ----------   ----------   ----------   ----------   ----------   ----------    --------   ----------
Deductions from net assets
 attributed to:
   Employee loans                   9,179        9,979        6,913          -         36,386          -       (62,457)         -
   Distributions to
     participants                 291,865      715,909      399,305      407,107      900,328      165,830         -         85,595
   Net depreciation in fair
     value of investments             -            -            -            -            -         88,726         -            -
                               ----------   ----------   ----------   ----------   ----------   ----------    --------   ----------
      Total deductions            301,044      725,888      406,218      407,107      936,714      254,556     (62,457)      85,595
                               ----------   ----------   ----------   ----------   ----------   ----------    --------   ----------
      Net increase (decrease)
        prior to interfund
        transfers                (191,389)     (56,362)      28,192      166,216     (578,990)     289,384    (102,544)     (85,448)

Asset transfers between
  trustees                     (1,387,278)  (4,821,709)  (3,205,516)  (3,334,155)  (4,209,545)  (1,541,179)   (259,674)       9,713
Interfund transfers                 6,011      131,597      110,568      102,541      680,757       21,566         -     (1,053,040)
                               ----------   ----------   ----------   ----------   ----------   ----------    --------   ----------
      Net increase (decrease)  (1,572,656)  (4,746,474)  (3,066,756)  (3,065,398)  (4,107,778)  (1,230,229)   (362,218)  (1,128,775)

Net assets available for
 benefits:
   Beginning of year            1,572,656    4,746,474    3,066,756    3,065,398    4,107,778    1,230,229     362,218    1,128,775
                               ----------   ----------   ----------   ----------   ----------   ----------    --------   ----------
   End of year                $       -    $       -    $       -    $       -    $       -    $       -     $     -    $       -
                               ==========   ==========   ==========   ==========   ==========   ==========    ========   ==========
</TABLE>
See accompanying notes to financial statements.

                                                                6

<PAGE>

<TABLE>

                                                PIONEER NATURAL RESOURCES USA, INC.
                                                            401(k) PLAN

                                Statement of Changes in Net Assets Available for Benefits (continued)
                                               For the year ended December 31, 1996

                                                                Vanguard Fiduciary Trust Company
                                         ----------------------------------------------------------------------------
                                                                              Mutual Funds
                                                     ----------------------------------------------------------------
                                                       Vanguard
                                                        Fixed       Vanguard                             Vanguard
                                           VMMR         Income        Index      Vanguard              International
                                           Prime      Securities    Trust 500    Primecap    Vanguard     Growth    
                                         Portfolio       Fund       Portfolio       Fund    Windsor II   Portfolio  
                                         ----------   ----------   ----------   ---------   ----------   ----------  
<S>                                      <C>          <C>          <C>          <C>         <C>          <C>
Additions to net assets attributed to:
   Investment income                     $   38,962   $   51,017   $   29,998   $   95,310  $  320,549   $   4,522  
   Employer contributions                   187,574       82,447      124,149      216,816     248,536      24,394  
   Employee contributions                   162,222       98,577      139,606      251,351     285,572      32,247  
   Transfers from other plans                16,970       56,420      118,491      135,315      16,725         -    
   Loan payments                             22,954        9,625       11,166       24,723      27,136          52  
   Net appreciation in fair value
      of investments                            -         11,307      171,532      207,224     291,706         -    
                                          ---------     --------     --------    ---------   ---------    --------  
         Total additions                    428,682      309,393      594,942      930,739   1,190,224     61,215   
                                          ---------     --------     --------    ---------   ---------    -------   
Deductions from net assets attributed to:
   Employee loans                            42,056       70,951       76,337      179,115     263,970         399  
   Distributions to participants             82,541       85,348       91,476      147,794     363,493         507  
   Net depreciation in fair value of
      investments                               -            -            -            -           -           158  
                                          ---------     --------     --------    ---------   ---------    --------  
         Total deductions                   124,597      156,299      167,813      326,909     627,463       1,064  
                                          ---------     --------     --------    ---------   ---------    --------  
           Net increase (decrease)
             prior to interfund
             transfers                      304,085      153,094      427,129      603,830     562,761      60,151  

Asset transfers between
   trustees                               1,373,024    1,601,242    1,601,235    3,335,346   4,747,045         -    
Interfund transfers                          (1,078)     (78,737)     147,810       (8,844)    (21,507)     71,053  
                                          ---------     --------     --------    ---------   ---------    --------  
         Net increase (decrease)          1,676,031    1,675,599    2,176,174    3,930,332   5,288,299     131,204  

Net assets available for benefits:
   Beginning of year                            -            -            -            -           -           -    
                                          ---------     --------    ---------    ---------   ---------    --------  
   End of year                           $1,676,031   $1,675,599   $2,176,174   $3,930,332  $5,288,299   $ 131,204  
                                          =========    =========    =========    =========   =========    ========  

See accompanying notes to financial statements.

                                                                 7a
</TABLE>

<PAGE>



<TABLE>

                                                PIONEER NATURAL RESOURCES USA, INC.
                                                            401(k) PLAN

                                     Statement of Changes in Net Assets Available for Benefits
                                               For the year ended December 31, 1996

                                                      Vanguard Fiduciary Trust Company
                                             -------------------------------------------------
                                             Investment      P&P       Participant
                                              Contracts   Securities      Loans
                                                Fund         Fund      Receivable     Total
                                             ----------   ----------   ----------   ---------- 
<S>                                          <C>          <C>          <C>          <C>
Additions to net assets attributed to:
   Investment income                         $  170,994   $    2,928   $  13,685   $ 1,065,639
   Employer contributions                        (3,557)     370,493         -       1,768,951
   Employee contributions                           -            -           -       1,890,581
   Transfers from other plans                       -            -           -         245,578
   Loan payments                                     16          -       (95,672)          -
   Net appreciation in fair value
      of investments                                -        602,119         -       2,129,176
                                              ---------    ---------    --------    ----------
         Total additions                        167,453      975,540     (81,987)    7,099,925
                                              ---------    ---------    --------    ----------
Deductions from net assets attributed to:
   Employee loans                               130,133          -      (762,961)          -
   Distributions to participants                399,780       94,193      30,518     4,261,589
   Net depreciation in fair value of
      investments                                   -            -           -          88,884
                                              ---------    ---------    --------    ----------
         Total deductions                       529,913       94,193    (732,443)    4,350,473
                                              ---------    ---------    --------    ----------
           Net increase (decrease)
             prior to interfund
             transfers                         (362,460)     881,347     650,456     2,749,452

Asset transfers between
   trustees                                   4,266,451    1,581,697     243,303           -
Interfund transfers                            (108,697)         -           -             -
                                              ---------    ---------    --------    ----------
         Net increase (decrease)              3,795,294    2,463,044     893,759     2,749,452

Net assets available for benefits:
   Beginning of year                                -            -           -      19,280,284
                                              ---------    ---------    --------    ----------
   End of year                               $3,795,294   $2,463,044   $ 893,759   $22,029,736
                                              =========    =========    ========    ==========

See accompanying notes to financial statements.

                                                                 7b
</TABLE>

<PAGE>



                       PIONEER NATURAL RESOURCES USA, INC.
                                   401(k) PLAN

                          NOTES TO FINANCIAL STATEMENTS
                           December 31, 1997 and 1996



Note 1.     Description of Plan

       The following  brief  description of the Pioneer  Natural  Resources USA,
Inc. 401(k) Plan (the "Plan")  provides only general  information.  Participants
should refer to the booklet entitled "The Pioneer Benefits Package:  Imagine the
Peace  of Mind"  for a  complete  description  of the  Plan,  a copy of which is
available to each  participant  from the Pioneer  Natural  Resources  USA,  Inc.
401(k) Plan  Committee  (the "Plan  Administrator").  The Plan is subject to the
provisions of the Employee Retirement Income Security Act of 1974 ("ERISA").

       General

       Parker & Parsley  Petroleum Company merged with MESA Inc. ("Mesa") during
August  1997,  creating  a  new  company,   Pioneer  Natural  Resources  Company
(collectively,  the "Company").  As a result of the merger, the Parker & Parsley
Retirement  Savings Plan became Pioneer Natural  Resources USA, Inc. 401(k) Plan
effective  October 1, 1997 and the Mesa  Profit  Sharing  Plan  merged  into the
Pioneer  Natural  Resources USA, Inc. 401(k) Plan on October 1, 1997. Net assets
transferred in were recorded at fair value on the date of transfer.

       The Plan is a defined  contribution  plan established  under the Internal
Revenue  Code Section 401 on January 1, 1990  covering all  employees of Pioneer
Natural Resources USA, Inc. ("the Employer"),  a wholly-owned  subsidiary of the
Company  and its  successor  or  successors.  Regular  full-time  employees  and
part-time  employees are eligible to  participate  on the first day of the month
following  their  date  of  hire.  Certain  administrative   functions  such  as
maintenance of account balances and allocation of earnings were performed by the
Wyatt  Company for the period  January 1, 1996  through June 28, 1996 and by the
Vanguard Group for the period June 29, 1996 through December 31, 1997.

       Contributions

       Prior to October 1, 1997,  participants of the Plan contributed an amount
of not less  than 2% nor  more  than 15% of their  annual  salary.  The  Company
matched  100% of the  first 6% of the Plan  participant's  compensation  through
September 30, 1997. The Company's contributions were made in the form of cash or
in common stock, or in a combination of cash and common stock.

       Effective  October 1, 1997,  participants may contribute an amount of not
less than 2% nor more than 12% of their annual  salary.  The  Employer  match is
contributed in cash to the Pioneer Natural  Resources USA, Inc. Matching Plan at
an amount equal to 200% of the first 5% of basic compensation contributed by the
Plan participants.

                                        8

<PAGE>


                       PIONEER NATURAL RESOURCES USA, INC.
                                   401(k) PLAN

                          NOTES TO FINANCIAL STATEMENTS
                           December 31, 1997 and 1996


Note 1.     Description of Plan (continued)

       Participant Accounts

       Each   participant's   account  is   credited   with  the   participant's
contributions and an allocation of Plan earnings. Plan earnings are allocated to
each  participant's  account in proportion to their fund balance relative to the
total fund balance.

       Investment Options

       During the Plan year ended December 31, 1997,  participants  were able to
allocate their contributions among the following investment options:

       o    Vanguard Money Market  Reserves - Prime Portfolio - Seeks to provide
            high  income  and  a  stable  share  price  of $1  by  investing  in
            short-term,   high  quality  money  market   instruments  issued  by
            financial   institutions,   nonfinancial   corporations,   the  U.S.
            government and federal agencies.

       o    Vanguard  Fixed  Income  Fund - ST  Corporate  Portfolio  - Seeks to
            provide  income  while  maintaining  a high degree of  stability  of
            principal by investing in short-term bonds,  including  high-quality
            corporate and U.S. Treasury securities.

       o    Vanguard  Index Trust - 500  Portfolio - Seeks to provide  long-term
            growth of capital  and income from  dividends  by holding all of the
            500  stocks  that  make  up the  unmanaged  Standard  &  Poor's  500
            Composite Stock Price Index, a widely  recognized  benchmark of U.S.
            stock market performance.

       o    Vanguard  Primecap  Fund - Seeks  long-term  growth  of  capital  by
            investing in stocks of companies  with  above-average  prospects for
            continued  earnings  growth,  strong industry  positions and skilled
            management teams.

       o    Vanguard/Windsor  II - Seeks to provide  long-term growth of capital
            and income from  dividends by investing  in a  diversified  group of
            out-of-favor stocks of  large-capitalization  companies.  The stocks
            generally sell at prices below the overall  market average  compared
            to their dividend income and future return potential.

       o    Vanguard International Growth Portfolio - Seeks to provide long-term
            growth of capital by investing in stocks of  high-quality,  seasoned
            companies based outside the United States.  Stocks are selected from
            more than 15 countries.

                                        9

<PAGE>


                       PIONEER NATURAL RESOURCES USA, INC.
                                   401(k) PLAN

                          NOTES TO FINANCIAL STATEMENTS
                           December 31, 1997 and 1996


Note 1.     Description of Plan (continued)

       o      Sarofim  Equity Fund - Seeks to provide  high growth of capital by
              investing in a broadly  diversified  portfolio of large companies.
              Income is a secondary goal.

       o      Pioneer Natural  Resources  Stable Value Fund - Seeks to provide a
              high level of income and a stable unit value of $1 in most cases.

       o      Pioneer  Natural  Resources  Stock  Fund  -  The  Pioneer  Natural
              Resources  Stock Fund is designed to provide  long-term  growth of
              capital through increases in the value of the common stock and the
              dividends paid on the stock.  Dividends are reinvested to purchase
              more shares.

       Vesting

       Participants are immediately vested in their voluntary contributions plus
actual  earnings  thereon.  Vesting in the remainder of their  accounts is based
upon years of continuous  service. A participant is fully vested in the Employer
matching  contributions  after  four  years of  service.  Vesting  in the profit
sharing contributions occurs after five years of service.

       Payments of Benefits

       If the total value of the vested portion of the participant's  account is
$3,500 ($5,000  commencing January 1, 1998) or less, payment will be made in one
lump sum as soon as administratively  possible. If the total value of the vested
portion of the participant's  account exceeds $3,500 ($5,000  commencing January
1, 1998), and the participant has not yet reached age 70-1/2, payment will be in
one lump  sum at age  70-1/2  unless  the  participant  consents  to an  earlier
distribution date by filing a written request to the Plan  Administrator  within
90 days prior to the date the participant wishes to receive the distribution.

       If the total  value of the vested  portion of the  participant's  account
exceeds $3,500 ($5,000 commencing January 1, 1998) the participant has the right
to defer payment of their account until age 70- 1/2. A participant's beneficiary
will receive the  participant's  account balance in the event of a participant's
death.

       Amounts due to participants terminating during the year have been accrued
as a liability  for  purposes  of  Internal  Revenue  Service  Form 5500.  As of
December 31, 1997 and 1996, assets of $237,736 and $46,113,  respectively,  were
reserved for terminated  participants  and were  distributed  subsequent to each
year end.

                                       10

<PAGE>


                       PIONEER NATURAL RESOURCES USA, INC.
                                   401(k) PLAN

                          NOTES TO FINANCIAL STATEMENTS
                           December 31, 1997 and 1996


Note 1.     Description of Plan (continued)

       Withdrawal of Benefits

       Employees  may withdraw  their vested  interest in the Plan under certain
hardship  conditions as defined in the Plan agreement.  Terminated  participants
may also withdraw their vested interest in the Plan.

       Plan Termination

       Although it has not  expressed  any intent to do so, the Employer has the
right  under  the  Plan to  discontinue  its  contributions  at any  time and to
terminate  the Plan  subject  to the  provisions  of ERISA.  In the event of the
Plan's termination, participants will become fully vested in their accounts.

Note 2.     Summary of Significant Accounting Policies

       Basis of Presentation

       The accompanying  financial  statements have been prepared on the accrual
basis of accounting.

       Trust Accounting

       The Plan's assets were held with Texas Commerce Bank, a national  banking
association  from January 1, 1996 through June 28, 1996.  On June 29, 1996,  the
assets of the Plan were  transferred  to Vanguard  Fiduciary  Trust Company (the
"Trustee").  The assets received by the Trustee shall constitute one common fund
and may be  commingled  with the assets of other  Company  affiliates  that have
adopted and are participating in the Plan.

       Investment Valuation

       Investments  are valued at fair value as determined by the Trustee.  Fair
value is determined as follows:

    1)     Investments in securities traded on national securities exchanges are
           valued at the last reported  sales price  on the last business day of
           the year;

    2)     Securities traded on  over-the-counter  markets and listed securities
           for which no sales were  reported on that date; if any, are valued at
           the mean between the last reported bid and asked prices; and

                                       11

<PAGE>


                       PIONEER NATURAL RESOURCES USA, INC.
                                   401(k) PLAN

                          NOTES TO FINANCIAL STATEMENTS
                           December 31, 1997 and 1996


Note 2.     Summary of Significant Accounting Policies (continued)

    3)     Investments in restricted  securities and other security investments,
           if any, not having an established  market are valued at fair value as
           determined by the investment manager of the trust.

    4)     Investments  in  guaranteed   investment   contracts  with  insurance
           companies  are valued at  contract  value,  which  approximates  fair
           value.

    5)     Participant  loans  receivable  are valued at their unpaid  principal
           balance which approximates fair value.

       Security Transactions and Investment Income

       Security  transactions are accounted for on a trade-date basis.  Expenses
incurred with transactions,  if any, are added to the purchase price or deducted
from the  selling  price at the time of the  transactions.  Dividend  income  is
recorded on the ex-dividend  date.  Income from other investments is recorded as
earned on an accrual basis.

       Use of Estimates

       The  preparation  of financial  statements in conformity  with  generally
accepted accounting principles requires the Plan Administrator to make estimates
and  assumptions  that affect the reported  amounts of net assets  available for
benefits at the date of the financial statements and the reported changes in net
assets available for benefits during the reporting periods. Actual results could
differ from those estimates.

       Reclassifications

       Certain  reclassifications  have been made to the 1996 amounts to conform
to the 1997 presentation.

Note 3.     Investments

       Statement of Position ("SOP") 94-4

       In September 1994, the American Institute of Certified Public Accountants
issued  Statement of Position ("SOP") 94-4,  "Reporting of Investment  Contracts
Held by Health  and  Welfare  Benefit  Plans and  Defined  Contribution  Pension
Plans,"  which  provides  guidance on how those plans should  report  investment
contracts issued by insurance companies,  banks, thrift institutions and others.
In accordance with SOP 94-4, funds with insurance companies at December 31, 1997
and 1996 are recorded at stated contract value,  which approximates fair values,
as reported to the Plan by the insurance companies.

                                       12

<PAGE>


                       PIONEER NATURAL RESOURCES USA, INC.
                                   401(k) PLAN

                          NOTES TO FINANCIAL STATEMENTS
                           December 31, 1997 and 1996


Note 3.     Investments (continued)

       Investment  contracts issued by insurance  companies at December 31 1997,
have contractual  interest rates ranging from 5.44% to 8.30% with maturity dates
ranging from June 1998 through December 1999.

       The number of units and net asset value per unit for the Pioneer  Natural
Resources  Stock Fund at  December  31, 1997 and 1996 was 262,770 and $10.43 and
185,061 and $13.23,  respectively.  Investments that represent 5% or more of the
Plan's net assets are separately identified.
<TABLE>

                                                 December 31, 1997              December 31, 1996
                                             -------------------------      -------------------------
                                             Shares/Units   Fair Value      Shares/Units   Fair Value
                                             ------------   ----------      ------------   ----------
       Investments
       -----------
<S>                                          <C>            <C>             <C>            <C>
Investments at fair value as determined by
  quoted market price:
    Vanguard Money Market Reserves - Prime
       Portfolio                              6,920,007     $ 6,920,007      1,676,031     $ 1,676,031

Mutual Funds:
    Vanguard Fixed Income Fund-ST
       Corporate Portfolio                      512,013       5,536,114        151,446       1,675,599
    Vanguard Index Trust 500 Portfolio           40,837       3,680,362         30,377       2,176,174
    Vanguard Primecap Fund                      156,311       6,188,725        126,396       3,930,332
    Vanguard Windsor II                         254,464       7,286,947        215,791       5,288,299
    Sarofim Equity Fund                         916,548      35,727,154            -               -
    Other                                                       364,755                        131,204

Pioneer Natural Resources Stock Fund            262,769       2,740,713        185,232       2,463,044
                                                             ----------                     ----------
                                                             68,444,777                     17,340,683
Participant loans (interest rates ranging
    from 7% to 10%)                                           1,538,357                        893,759
Pioneer Natural  Resources  Stable Value
    Fund (investments at contract value -
    funds with insurance companies)
    (see Note 3).                                             3,178,713                      3,795,294
                                                             ----------                     ----------
                                                            $73,161,847                    $22,029,736
                                                             ==========                     ==========
</TABLE>

Note 4.     Administrative Expenses

       The  Employer  may pay all  expenses  incurred in the  establishment  and
administration of the Plan,  including expenses and fees of the Trustee,  but it
shall not be obligated to do so, and any such  expenses not paid by the Employer
shall be paid from the Plan earnings.  The Employer paid  approximately  $58,000
and $90,000 of administrative expenses relating to 1997 and 1996, respectively.


                                       13

<PAGE>


                       PIONEER NATURAL RESOURCES USA, INC.
                                   401(k) PLAN

                          NOTES TO FINANCIAL STATEMENTS
                           December 31, 1997 and 1996


Note 5.     Tax Status of the Plan

       By letter dated January 17, 1997, the Internal Revenue Service determined
that  the  Plan,  as  then  designed,  was in  compliance  with  the  applicable
requirements  of the Internal  Revenue  Code.  The Plan has been  amended  since
receiving  the  determination  letter and  application  for a new  determination
letter was made in June of 1998. No reply has been received;  however,  the Plan
Administrator  and the Plan's tax  counsel  believe  that the Plan is  currently
designed and being operated in compliance  with the applicable  requirements  of
the Internal Revenue Code.  Therefore,  they believe that the Plan was qualified
and the related trust was tax-exempt as of December 31, 1997 and 1996.

Note 6.     Related Party Transactions

       Certain Plan  investments  are shares of mutual funds managed by Vanguard
Fiduciary  Trust  Company.  Vanguard  Fiduciary  Trust Company is the Trustee as
defined   by  the  Plan  and,   therefore,   these   transactions   qualify   as
party-in-interest.

Note 7.     Reconciliation of Financial Statements to Form 5500

       The following is a  reconciliation  of net assets  available for benefits
per the financial statements to the Form 5500:
                                                            December 31,
                                                   -------------------------
                                                       1997            1996
                                                   -----------   -----------
   Net assets available for benefits per the
     accompanying financial statements             $73,161,847   $22,029,736
   Amounts allocated to withdrawing participants      (237,736)      (46,113)
                                                    ----------    ----------
   Net assets available for benefits per the
     Form 5500                                     $72,924,111   $21,983,623
                                                    ==========    ==========

       The following is a  reconciliation  of benefits paid to participants  per
the financial statements to the Form 5500:
                                                       For the year ended
                                                           December 31,
                                                   --------------------------
                                                       1997          1996
                                                   -----------   ------------
   Benefits paid to participants per the
     accompanying financial statements             $ 1,409,604   $  4,261,589
   Add: Amounts allocated to withdrawing
     participants at end of year                       237,736         46,113
   Less: Amounts allocated to withdrawing
     participants at beginning of year                 (46,113)    (1,024,061)
                                                    ----------    -----------
       Benefits paid to participants per
         the Form 5500                             $ 1,601,227   $  3,283,641
                                                    ==========    ===========

       Amounts  allocated to withdrawing  participants  are recorded on the Form
5500 for benefit  claims that have been processed and approved for payment prior
to December 31, but not yet paid as of that date.

                                       14

<PAGE>


                       PIONEER NATURAL RESOURCES USA, INC.
                                   401(k) PLAN

                          NOTES TO FINANCIAL STATEMENTS
                           December 31, 1997 and 1996


Note 8.     Merger

       As discussed in Note 1, the Mesa Profit Sharing Plan merged into the Plan
on October 1, 1997. As a result,  any former Mesa employees hired by Pioneer who
wished to do so were allowed to transfer  the  balances  from their tax deferred
savings  plans to the Plan.  The fair value of the net assets of the Mesa Profit
Sharing  Plan totaled  $43,675,657  at date of transfer and were rolled into the
Plan on October 1, 1997 and are included in the  December  31, 1997  balances of
the Plan.





                                       15

<PAGE>

<TABLE>

                                                                                             Schedule I




                                    PIONEER NATURAL RESOURCES USA, INC.
                                                401(k) PLAN

                        Item 27a - Schedule of Assets Held for Investment Purposes
                                       (As reported by the Trustee)

                                             December 31, 1997





(a)&(b) Identity of issue,                (c) Description of investment          (d) Cost      (e) Current
        borrower, lessor,                     including maturity date, rate                        Value
        or similar party                      of interest, collateral, par or
                                              maturity value

<S>                                        <C>                                   <C>           <C> 
VMMR Prime Portfolio*                      Money Market Fund                     $ 6,920,007   $ 6,920,007
Vanguard Fixed Income-ST Corporate
  Portfolio*                               Mutual Fund                             5,516,188     5,536,114
Vanguard Index Trust 500 Portfolio*        Mutual Fund                             2,872,952     3,680,362
Vanguard Primecap Fund*                    Mutual Fund                             4,845,166     6,188,725
Vanguard Windsor II*                       Mutual Fund                             6,128,990     7,286,947
Vanguard International Growth Portfolio*   Mutual Fund                               380,071       364,755
Sarofim Equity Fund*                       Mutual Fund                            35,277,286    35,727,154
Pioneer Natural Resources Stable
  Value Fund*                              Unallocated Insurance Contract          3,178,713     3,178,713
Pioneer Natural Resources Stock Fund*      Common Stock Fund                       2,415,438     2,740,713
Participant loans receivable*              Interest rates ranging from 7%-10%      1,538,357     1,538,357
                                                                                  ----------    ----------

                                                                                 $69,073,168   $73,161,847
                                                                                  ==========    ==========
</TABLE>


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

*   Party in-interest



See accompanying independent auditors' report.


                                       16

<PAGE>


<TABLE>

                                                                                   Schedule II
                       PIONEER NATURAL RESOURCES USA, INC.
                                   401(k) PLAN

                                    Item 27d
                       Schedule of Reportable Transactions
                          (As reported by the Trustee)
                          Year ended December 31, 1997
     (A) and (B)                                        (C)          (D)       (E)       (F)          (G)         (H)        (I)
                                                                                                                 Current
                                                                                       Expense                    value
                                                                                       incurred                of asset on
                                        Number of    Purchase      Selling    Lease      with       Cost of    transaction    Net
     Identity of Party Involved       transactions     Price        Price     Rental  transaction    Assets       date        gain
- ------------------------------------  ------------  -----------  -----------  ------  -----------  ----------  -----------  --------
<S>                                   <C>           <C>          <C>          <C>     <C>          <C>         <C>          <C>
Sarofim Equity Fund*
  Sarofim                                   23      $35,761,836  $            $   -    $      -    $           $35,761,836  $    -
  Sarofim                                   15                       485,010      -           -       484,551      485,010       459
Vanguard VMMR Prime Portfolio *
  VMMR Prime Portfolio                     272        6,773,012                   -           -                  6,773,012       -
  VMMR Prime Portfolio                     197                     1,385,152      -           -     1,385,152    1,385,152       -
Vanguard Fixed Income Fund - ST
 Corporate Portfolio *
  Fixed Income Securities                  170        4,411,274                   -           -                  4,411,274       -
  Fixed Income Securities                  153                       527,404      -           -       525,454      527,404     1,950
Vanguard Index Trust 500
 Portfolio *
  Index Trust                              134        1,414,589                   -           -                  1,414,589       -
  Index Trust                              162                       577,649      -           -       494,566      577,649    83,083
Vanguard Primecap Fund *
  Primecap                                 115        1,762,942                   -           -                  1,762,942       -
  Primecap                                 138                       640,081      -           -       520,427      640,081   119,654
Vanguard Windsor II *
  Windsor II                               118        2,523,434                   -           -                  2,523,434       -
  Windsor II                               168                     1,468,489      -           -     1,294,760    1,468,489   173,729
Pioneer Natural Resources Stable
 Value Fund*
  Investment Contracts                      74          229,599                   -           -                    229,599       -
  Investment Contracts                     133                       869,569      -           -       869,569      869,569       -
Pioneer Natural Resources Stock
 Fund *
  Pioneer                                   49        1,102,806                   -           -                  1,102,806       -
  Pioneer                                   85                       209,694      -           -       147,254      209,694    62,440
- --------------------
*  Party-in-interest
Expenses incurred with transactions,  if any, are added to the purchase price or
deducted from the selling price at the time of the transaction.

See accompanying independent auditors' report.
</TABLE>
                                       17

<PAGE>



                 PIONEER NATURAL RESOURCES USA, INC. 401(K) PLAN


                               S I G N A T U R E S



The Plan,  pursuant to the requirements of the Securities  Exchange Act of 1934,
the trustee has duly caused this annual report to be signed on its behalf by the
undersigned thereto duly authorized.


                                PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN

                                By:  Pioneer Natural Resources USA, Inc. 401(k)
                                     Plan Committee



Date:   June 26, 1998           By:     /s/ Larry N. Paulsen
                                    --------------------------
                                      Larry N. Paulsen
                                      Chairman


Date:   June 26, 1998           By:     /s/ Warren Garden
                                    --------------------------
                                      Warren Garden



Date:   June 26, 1998           By:     /s/ Stephan R. Petty
                                    --------------------------
                                      Stephan R. Petty


                                       18

<PAGE>


                                INDEX TO EXHIBITS


Exhibit
Number                         Description                                 Page

  23.1               Consent of KPMG Peat Marwick LLP




                                       19

<PAGE>




                                                                   EXHIBIT 23.1



                         CONSENT OF INDEPENDENT AUDITORS



The Board of Directors
Pioneer Natural Resources USA, Inc. 401(k) Plan

We consent to  incorporation  by reference in the  registration  statement  (No.
333-39249) on Form S-8 of Pioneer Natural Resources USA, Inc. 401(k) Plan of our
report dated June 12, 1998, on our audits of the financial statements of Pioneer
Natural Resources USA, Inc. 401(k) Plan as of December 31, 1997 and 1996 and for
the years ended  December  31, 1997 and 1996,  which  report is included in this
annual report on Form 11-K.



                                                       KPMG Peat Marwick LLP

Midland Texas
June 25, 1998


                                       20

<PAGE>





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