[1] Amoco E and P Technology Group, P.O. Box 3385, Tulsa, OK 74133, United States
[2] BP Amoco Upstream Technology Group, P.O. Box 3385, Tulsa, OK 74133, United States
[3] Amoco E and P Technology Group, Amoco House, West Gate, London W51XL, United Kingdom
[4] BP Amoco Upstream Technology Group, Building 200, Chertsey Road, Middlesex TW16 7LN, United Kingdom
[5] Allied Geophysics Laboratory, Department of Geosciences, University of Houston, 4800 Calhoun Road, Houston, TX 77204, United States