1 EXHIBIT 23.3 CONSENT OF INDEPENDENT PETROLEUM ENGINEERS AND GEOLOGISTS As independent petroleum consultants, we hereby consent to the incorporation by reference of our report to Rutherford-Moran Oil Corporation dated July 28, 1997 in this Registration Statement on Form S-4, dated November 25, 1997. We also consent to all references to our firm included as part of this Registration Statement. /s/ RYDER SCOTT COMPANY PETROLEUM ENGINEERS RYDER SCOTT COMPANY PETROLEUM ENGINEERS Houston, Texas November 25, 1997