EXHIBIT 23.6 March 7, 2003 Devon Energy Corporation 20 North Broadway Oklahoma City, Oklahoma U.S.A. 73102-8260 CONSENT OF AJM PETROLEUM CONSULTANTS We consent to the reference in this Registration Statement of Devon Energy Corporation on Form S-4 to our firm name and to our appraisal report relating to Canadian reserves for Devon Energy Corporation as of December 31, 2002, incorporated herein by reference. AJM PETROLEUM CONSULTANTS By: /s/ ROBIN G. BERTRAM ---------------------------------- Name: Robin G. Bertram, P. Eng. Title: Vice President, Engineering