EX-23.1 10 h19825exv23w1.txt CONSENT OF NETHERLAND, SEWELL & ASSOCIATES, INC. EXHIBIT 23.1 [NSAI LOGO] CHAIRMAN EMEHITOS EXECUTIVE COMMITTEE WORLDWIDE PETROLEUM CONSULTANTS [ILLEGIBLE] [ILLEGIBLE] ENGINEERING - GEOLOGY [ILLEGIBLE] - GEOPHYSICS - PETROPHYSICS CHAIRMAN & CEO FREDERIC D SEWELL P SCOTT FROST . DALLAS DAN PAUL SMITH . DALLAS PRESIDENT & COO JOSEPH J SPELLMAN . DALLAS C H.(SCOTT) REES III THOMAS J TELLAII . DALLAS -------------------------------------------------------------------------------- Exhibit 23.1 CONSENT OF INDEPENDENT PETROLEUM ENGINEERS AND GEOLOGISTS We hereby consent to the incorporation by reference in the Quarterly Report on Form 10-Q of Mission Resources Corporation (the "Company") for the quarterly period ended September 30, 2004, and to the incorporation by reference thereof into the Company's previously filed Registration Statements on Form S-3 (333-119258, 333-113971 and 333-111955) and Form S-8 (File Nos. 333-116404, 333-105169, 333-63562, 333-54798, 333-57827, 333-27707 and 333-91326), of the references to this firm relating to the Company's estimated domestic proved reserves as of July 1, 2004. NETHERLAND, SEWELL & ASSOCIATES, INC. By: /s/ J. Carter Henson, Jr. ----------------------------------------- J. Carter Henson, Jr. Senior Vice President [ILLEGIBLE] November 9, 2004 -------------------------------------------------------------------------------- 4500 THANKSGIVING TOWER - 1601 ELM STREET - DALLAS nsai@nsai-petro.com TEXAS 75201-4754 - PH 214-969-5401 - FAX: 214-969-5411 1221 LAMAR STREET SUITE 1200 - HOUSTON. TEXAS netherlandsewell.com 77010-3072 - PH 713-854-4850 - FAX 713-654-4951