1. Petroleum Microbiology Research Group, Department of Biological Sciences, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada, Computer Modelling Group Limited, 150, 3553 31st Street NW, Calgary, Alberta, T2L 2K7, Canada, Enerplus Resources Fund, 3000 333 Seventh Avenue SW, Calgary, Alberta, T2P 2Z1, Canada, Baker Hughes Incorporated, 208 Saskatchewan Drive NE, Redcliff, Alberta, T0J 2P0, Canada, and Baker Hughes Incorporated, 12645 W Airport Boulevard, Sugar Land, Texas 77478