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                                                                    EXHIBIT 12.2
 
                  PRO FORMA RATIO OF EARNINGS TO FIXED CHARGES
                          YEAR ENDED DECEMBER 31, 1993
                             (DOLLARS IN THOUSANDS)
 
   


                                                                                          PRO
                                                           HISTORICAL    ADJUSTMENTS(1)  FORMA
                                                           --------      ---------      --------
                                                                               
Net pretax income(2).....................................  $ 26,983      $  (9,007)     $ 17,976
Fixed Charges
  Interest expense.......................................    30,506          9,007        39,513
  Preferred stock dividends of a subsidiary..............     1,681                        1,681
  Capitalized debt cost..................................     1,536                        1,536
  Interest portion of rent expenses......................     2,777                        2,777
                                                           --------      ---------      --------
          Total fixed charges............................    36,500          9,007        45,507
  Less: Capitalized interest, net........................     4,623                        4,623
                                                           --------      ---------      --------
                                                             31,877          9,007        40,884
Earnings before fixed charges............................  $ 58,860                     $ 58,860
                                                           --------      ---------      --------
                                                           --------      ---------      --------
Ratio of earnings to fixed charges.......................      1.61                         1.29

    
 
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(1) The pro forma adjustments give effect to increased interest expense, as if
    such transaction had taken place January 1, 1993 as a result of the issuance
    of $200 million of the Notes at a pro forma annual interest rate of 8.6% and
    the application of proceeds to the reduction of debt under the revolving
    credit facility and the uncommitted and unsecured lines of credit.
    
 
   
(2) During 1993, the Company recorded a non-cash charge to depreciation,
    depletion and amortization of $103 million pretax ($48 million after-tax)
    for the write-down of its investment in the U. K. North Sea's Piper field.
    Excluding the effect of the Piper write-down, the historical ratio of
    earnings to fixed charges for 1993 would have been 4.45. Excluding the
    effect of the Piper write-down, this pro forma ratio would have been 3.57.