|St. Peter Sandstone, Illinois Basin
Most hydrocarbon production in the Illinois Basin is from Mississipian-age units. Zuppemann and Keith (1988) provided a map showing the locations of gas and oil fields in Cambrian/Ordovician units, which was used in the GIS. This map shows that oil and gas production from the Cambrian/Ordovician units is limited and probably not a major concern for CO2 sequestration.
Zuppann, C. W., and Keith, B. D. (eds.), 1988, Geology and petroleum production of the Illinois Basin, Volume 2: Joint Publication of the Illinois and Indiana-Kentucky Geological Societies, Mt. Vernon, IL, 272p.