1 EXHIBIT 23.3 {INTERA INFORMATION TECHNOLOGIES INC. LETTERHEAD} CONSENT OF PETROLEUM ENGINEERS As independent petroleum engineers, we hereby consent to the reference to our Firm's review of Apache's proved oil and gas reserve quantities as of January 1, 1994 included in the Company's Annual Report on Form 10-K for the fiscal year ending December 31, 1993, and incorporated by reference into the Company's Registration Statements on Form S-3 (No. 33-51253) and Form S-8 (Nos. 33-53442, 33-37402 and 33-31407). /s/ OMER GURPINAR Omer Gurpinar, Vice President Reservoir Sumulation INTERA Information Technologies Inc. Petroleum Services Division Houston, Texas March 17, 1994