EXHIBIT 23.3 NETHERLAND, SEWELL & ASSOCIATES, INC. CONSENT OF NETHERLAND, SEWELL & ASSOCIATES, INC. PETROLEUM ENGINEERS We hereby consent to the incorporation by reference in Convest Energy Corporation's previously filed Registration Statements on Form S-8 (Registration Nos. 33-44614, 33-73638 and 33-73588) and references to our firm contained in the Convest Energy Corporation Annual Report on Form 10-K for the year ended December 31, 1996. NETHERLAND, SEWELL & ASSOCIATES, INC. By: /s/ FREDERIC D. SEWELL Frederic D. Sewell President Dallas, Texas March 27, 1997