EX-23 5 s461464.txt EXHIBIT 23.3 EXHIBIT 23.3 CONSENT OF NETHERLAND, SEWELL AND ASSOCIATES, INC. We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of the use of our name and information related to reserves in the Annual Report on Form 10-K of Western Gas Resources, Inc. and Subsidiaries for the year ended December 31, 2003. Netherland, Sewell and Associates, Inc. By: /s/ C.H. Scott Rees --------------------------- C.H. (Scott) Rees III President and Chief Operating Officer Denver, Colorado April 12 2004