visualization to geophysical problems. He is a member of the Society of Exploration Geophysicists, American Geophysical Union, the Acoustical Society of America, and the Society of Professional Well Log Analysts.

JAMES A. DRAHOVZAL is Geologist and Head of the Petroleum and Stratigraphy Section of the Kentucky Geological Survey and adjunct professor of geology at the University of Kentucky. Previously, he was a research associate in tectonics and basin analysis for ARCO Research and Technical Services. His research areas are regional geology, oil and gas reservoirs and plays of the Appalachian and Illinois Basins, and Cincinnati Arch fractured carbonate reservoirs. He received his B.A., M.S., and Ph.D. (geology) degrees from the University of Iowa. He is a member of the Geological Society of America and the American Association of Petroleum Geologists.

GEORGE J. HIRASAKI received his Ph.D. degree in chemical engineering from Rice University. He is a member of the National Academy of Engineering, American Chemical Society, Society of Core Analysis, Society of Professional Well Log Analysts, SIAM, the Society of Petroleum Engineers, and the American Institute of Chemical Engineers. He is a Professor in the Department of Chemical Engineering at Rice University in Houston, Texas. He has been a staff reservoir engineer with Shell Oil Company and research advisor at the Bellaire Research Center of the Shell Development Company. Prof. Hirasaki is the author of various publications and has been granted three patents. His research interests are interfacial phenomena, numerical simulation, multiphase flow in porous media, wettability, foam in porous media, and surfactant flooding.

NEIL F. HURLEY is an advanced research geologist with Marathon Oil Company. Previously, he was a geologist with Conoco Incorporated. He received a B.S. in geological sciences and a B.S. in petroleum engineering from the University of Southern California, an M.S. in geology from the University of Wisconsin at Madison, and a Ph.D. from the University of Michigan. He currently works for Marathon Oil Company. His research interests are reservoir characterization, carbonate reservoirs, fractured reservoirs, and horizontal wells. He is a member of the Society of Petroleum Engineers, Society for Sedimentary Geology, Society of Petroleum Well Log Analysts, and the American Association of Petroleum Geologists.

RANDI S. MARTINSEN received her B.S. in geology from the State University of New York, Stony Brook, and her M.S. in geology from Northern Arizona University. She is a Senior Lecturer in the Department of Geology and Geophysics at the University of Wyoming and a consulting petroleum



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