1 EXHIBIT 23.12 CONSENT OF GILBERT LAUSTSEN JUNG ASSOCIATES LTD. We consent to the reference to our firm name in this Registration Statement and the reference to our firm name and our reports providing estimates of the natural gas, natural gas liquids and conventional oil reserves of Anderson Exploration Ltd. as of March 31, 2000 and September 30, 2000 in this Form S-4 of Devon Energy Corporation. GILBERT LAUSTSEN JUNG ASSOCIATES LTD. /s/ HARRY JUNG Harry Jung, P. Eng. Executive Vice President Calgary, Alberta September 13, 2001