Exhibit 99.1 UNAUDITED PRO FORMA CONDENSED FINANCIAL INFORMATION On September 11, 1997, Seagull Energy Corporation, a Texas corporation ("Seagull" or the "Company"), entered into a Share Sale Agreement with Rio Alto Exploration Ltd. ("Rio Alto") regarding the sale of Seagull's Canadian oil and gas subsidiary, Seagull Energy Canada Ltd. ("Seagull Canada"). The unaudited pro forma condensed statements of operations for the six months ended June 30, 1997 and the year ended December 31, 1996 give effect to the sale of Seagull Canada as if the disposition had occurred on January 1, 1996. The unaudited pro forma condensed balance sheet as of June 30, 1997 gives effect to the sale of Seagull Canada as if the disposition had occurred on June 30, 1997. The unaudited pro forma information presented is based on the historical consolidated financial statements of Seagull and should be read in conjunction with such financial statements and the related notes thereto. Certain reclassifications have been made to 1996 information to conform to the presentation used in 1997. The unaudited pro forma information presented does not purport to be indicative of actual results, as if the disposition had been in effect on the dates or for the periods indicated, or of future results. SEAGULL ENERGY CORPORATION PRO FORMA STATEMENT OF OPERATIONS (Amounts in Thousands Except Per Share Amounts) Six Months Ended June 30, 1997 ----------------------------------------------------------------------- Seagull Pro Forma Seagull Canada Adjustments Pro Forma ------------- --------------- ------------------ --------------- (A) Revenues: Oil and gas operations $ 230,410 $ 18,384 $ 212,026 Alaska transmission and distribution 51,343 - 51,343 ------------- --------------- ------------------ --------------- 281,753 18,384 - 263,369 ------------- --------------- ------------------ --------------- Costs of Operations: Alaska transmission and distribution cost of gas sold 23,966 - 23,966 Operations and maintenance 83,876 5,887 77,989 Exploration charges 16,299 1,469 14,830 Depreciation, depletion and amortization 87,772 7,595 80,177 General and administrative 5,423 - 5,423 ------------- --------------- ------------------ --------------- 217,336 14,951 - 202,385 ------------- --------------- ------------------ --------------- Operating Profit (Loss) 64,417 3,433 - 60,984 Other (Income) Expense: Interest expense 19,995 1,360 (3,125) (B) 15,510 (Gain) loss on sales of property, plant and equipment, net 118 (15) 133 Interest income and other (1,031) (6) (1,025) ------------- --------------- ------------------ --------------- Income Before Income Taxes 45,335 2,094 3,125 46,366 ------------- --------------- ------------------ --------------- Income Tax Expense 25,460 1,332 1,094 (C) 25,222 ------------- --------------- ------------------ --------------- Net Income $ 19,875 $ 762 $ 2,031 $ 21,144 ============= =============== ================== =============== Earnings Per Share $ 0.31 $ 0.33 ============= =============== Weighted Average Number of Common Shares Outstanding 64,028 64,028 ============= =============== See accompanying notes to unaudited pro forma condensed statement of operations. SEAGULL ENERGY CORPORATION PRO FORMA STATEMENT OF OPERATIONS (Amounts in Thousands Except Per Share Amounts) Year Ended December 31, 1996 ----------------------------------------------------------------------- Seagull Pro Forma Seagull Canada Adjustments Pro Forma ------------- --------------- ------------------ --------------- (A) Revenues: Oil and gas operations $ 419,595 $ 33,816 $ 385,779 Alaska transmission and distribution 97,616 - 97,616 ------------- --------------- ------------------ --------------- 517,211 33,816 - 483,395 ------------- --------------- ------------------ --------------- Costs of Operations: Alaska transmission and distribution cost of gas sold 42,600 - 42,600 Operations and maintenance 147,294 14,147 133,147 Exploration charges 50,772 4,295 46,477 Depreciation, depletion and amortization 155,669 16,856 138,813 General and administrative 17,433 - 17,433 ------------- --------------- ------------------ --------------- 413,768 35,298 - 378,470 ------------- --------------- ------------------ --------------- Operating Profit (Loss) 103,443 (1,482) - 104,925 Other (Income) Expense: Merger expense 9,982 - 9,982 Interest expense 44,842 4,191 (6,170) (B) 34,481 (Gain) loss on sales of property, plant and equipment, net (1,088) (501) (587) Interest income and other (5,149) (350) (4,799) ------------- --------------- ------------------ --------------- 48,587 3,340 (6,170) 39,077 ------------- --------------- ------------------ --------------- Income (Loss) Before Income Taxes 54,856 (4,822) 6,170 65,848 Income Tax Expense 25,895 1,375 2,160 (C) 26,680 ------------- --------------- ------------------ --------------- Net Income (Loss) $ 28,961 $ (6,197) $ 4,010 $ 39,168 ============= =============== ================== =============== Earnings Per Share $ 0.45 $ 0.61 ============= =============== Weighted Average Number of Common Shares Outstanding 64,073 64,073 ============= =============== See accompanying notes to unaudited pro forma condensed statement of operations. NOTES TO UNAUDITED PRO FORMA CONDENSED STATEMENTS OF OPERATIONS The Company expects to close the transaction no later than early in the fourth quarter 1997. These pro forma financial statements do not include any purchase price adjustments to be determined upon closing, which are not expected to be material to the financial information presented herein. (A) To remove the results of operations of Seagull Canada. (B) To reduce interest expense to give effect to the use of net proceeds from the disposition to reduce amounts outstanding under U.S. and Canadian credit facilities. (C) To adjust U.S. federal incomes taxes for the impact of the adjustments described in Note (B) above. This amount does not include the tax benefits that are expected to be realized upon closing of the sale of approximately $4.0 million. SEAGULL ENERGY CORPORATION PRO FORMA CONDENSED BALANCE SHEET (Amounts in Thousands) June 30, 1997 ------------------------------------------------------------ Seagull Pro Forma Seagull Canada Adjustments Pro Forma ------------- ------------- -------------- ------------- (A) Assets Current Assets: Cash and cash equivalents $ 29,465 $ 38 - $ 29,427 Accounts receivable, net 149,346 4,565 144,781 Inventories 13,638 638 13,000 Prepaid expenses and other 15,271 360 14,911 ------------- ------------- ------------ ----------- Total Current Assets 207,720 5,601 - 202,119 Property, Plant and Equipment - at cost (successful efforts method for oil and gas properties) 2,177,335 248,189 1,929,146 Accumulated Depreciation, Depletion and Amortization 890,298 57,166 833,132 ------------- ------------ ------------ ----------- 1,287,037 191,023 - 1,096,014 Other Assets 43,011 456 42,555 ------------- ------------ ------------ ----------- Total Assets $1,537,768 $ 197,080 $ - $1,340,688 ============= ============ ============ =========== Liabilities and Shareholders' Equity Current Liabilities: Accounts and note payable $ 158,140 $ 4,346 $ 153,794 Accrued expenses 45,028 877 44,151 Current maturities of long-term debt 7,247 - - 7,247 ------------- ------------ ------------ ----------- Total Current Liabilities 210,415 5,223 205,192 Long-Term Debt 588,752 64,436 (113,064)(B) 411,252 Other Noncurrent Liabilities 60,348 103 60,245 Deferred Income Taxes 42,154 23,589 (4,000)(C) 14,565 Redeemable Bearer Shares 15,837 - 15,837 Shareholders' Equity 620,262 103,729 117,064 (D) 633,597 Commitments and Contingencies - - ------------- ----------- ------------ ----------- Total Liabilities and Shareholders' Equity $1,537,768 $ 197,080 $ - $1,340,688 ============= =========== ============ =========== See accompanying notes to unaudited pro forma condensed balance sheet. NOTES TO UNAUDITED PRO FORMA CONDENSED BALANCE SHEET The Company expects to close the transaction no later than early in the fourth quarter 1997. These pro forma financial statements do not include any purchase price adjustments to be determined upon closing, which are not expected to be material to the financial information presented herein. (A) To remove the assets, liabilities and shareholders' equity of Seagull Canada. (B) To reflect estimated use of net proceeds at June 30, 1997 to repay all the long-term debt of Seagull Canada ($64.4 million) and the remainder to reduce Seagull's long-term debt ($113.1 million). (C) To record the estimated income tax benefit of $4 million associated with the sale of Seagull Canada. (D) To (i) record the gain on sale of Seagull Canada, including the related income tax benefit, as if the disposition had occurred on June 30, 1997, and (ii) reflect shareholders' equity of Seagull Canada as of June 30, 1997.