<ARTICLE> 5 <CIK> 0000850506 <NAME> GEODYNE ENERGY INCOME LTD PARTNERSHIP II-F <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-START> JAN-01-1998 <PERIOD-END> SEP-30-1998 <CASH> 205,738 <SECURITIES> 0 <RECEIVABLES> 163,849 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 369,587 <PP&E> 11,198,987 <DEPRECIATION> 9,050,237 <TOTAL-ASSETS> 2,575,204 <CURRENT-LIABILITIES> 49,116 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 0 <OTHER-SE> 2,498,181 <TOTAL-LIABILITY-AND-EQUITY> 2,575,204 <SALES> 1,087,834 <TOTAL-REVENUES> 1,758,202 <CGS> 0 <TOTAL-COSTS> 702,606 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 1,055,596 <INCOME-TAX> 0 <INCOME-CONTINUING> 1,055,596 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 1,055,596 <EPS-PRIMARY> 5.80 <EPS-DILUTED> 0