EXHIBIT 12 VASTAR RESOURCES, INC. STATEMENT SETTING FORTH DETAIL OF COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES (Unaudited) For the six months ended June 30, ---------------- 1999 1998 ------ ------ (Millions of dollars, except per share amounts) Income from continuing operations before income taxes, minority interest and cumulative effect of change in accounting principle(1).......... $34.6 $44.2 Fixed Charges: Interest expense charged to income, and portion of rentals representative of interest(2)............ 43.3 27.1 Capitalized Interest................................. 0.1 0.0 ----- ----- Total fixed charges................................... 43.4 27.1 ----- ----- Earnings (1) + (2).................................... $78.0 $71.3 ===== ===== Ratio of earnings to fixed charges.................... 1.8 2.6 ===== ===== The Company has no issuances of preferred stock.