llinois Geological Society
When: Wednesday, April 26th, Social Hour 5:00, Dinner 6:00, Speaker 6:30
Where: Hogg Heaven, Mt. Carmel, IL – Located in the party room behind the restaurant
Please RSVP to Stephanie Storckman – email@example.com
John B. Hickman
“Structural, Depositional, and Hydrocarbon Exploration Histories of the Rough Creek Graben of Western Kentucky and Southern Illinois”
John Hickman received his B.Sc. in geology from the University of Michigan, a M.Sc. from Texas A&M University, and a Ph.D. from the University of Kentucky. He joined the Kentucky Geological Survey at the University of Kentucky in 1999, and has since worked on four regional (multistate) oil and gas assessment projects, both local (site assessment) and regional CO2 sequestration capacity studies, as well as performing structural and reflection seismic interpretations for various other KGS projects. Along with his state survey work, John is an adjunct assistant professor in the Department of Earth and Environmental Sciences at UK, and teaches classes on well-log interpretation and petroleum-geology software. John is also the current President of the Eastern Section of the American Association of Petroleum Geologists.
Drilling and geophysical data demonstrate that the Rough Creek Graben is a fault-bounded extensional feature filled with more than 27,000 feet of Cambrian sediments. Detailed analysis of well logs, seismic profiles, and surface geologic maps indicates that active rifting of the Precambrian crystalline bedrock began by the Early Cambrian, and resulted in thick, sand-rich deposits of the Reelfoot Arkose in the Rough Creek Graben and the adjacent Mississippi Valley Graben. Subsidence continued in these grabens during the Middle to Late Cambrian, leading to an alternating succession of shales, siltstones, and carbonates being deposited within the Eau Claire Formation. Tectonic quiescence followed throughout the end of the Cambrian and into the Early Ordovician, leading to the deposition of the regionally extensive Knox Group carbonates. Although the tectonic extension that formed these features ended by the MiddleCambrian, fault zone reactivation during the Taconic, Acadian, and Alleghenian Orogenies altered fault-block orientations and produced some areas of basin inversion.
Deep drilling to explore pre-Knox strata in the Rough Creek Graben began in 1974 with the Texas Gas Transmission #1 Herman Shain well. This dry hole was drilled in west-central Grayson County, Kentucky; about 2.6 miles south of the Rough Creek Fault Zone and penetrated 5,120 feet of Eau Claire Formation shales and limestones before reaching total depth. Over the 21 years, exploration efforts by Conoco (3 wells), Exxon (2 wells), and Sun Oil (1 well) all proved unsuccessful, despite minor shows and evidence of past hydrocarbon migration. No wells have been drilled to sub-Knox Group sediments within the graben since 1993.