ABSTRACT
Much oil is produced in the region of the lower Wabash River which is the boundary between Illinois and Indiana in this area. Oil and gas are produced from lower Pennsylvanian and Chester (upper Mississippian) sandstones and from the Fredonia limestone (McClosky “lime”) of the Ste. Genevieve formation (lower Mississippian series). The oil fields occur along a broad slightly folded anticline that roughly parallels the course of the river. The areal distribution of the oil pools is different for each producing formation and appears to be controlled to a greater degree by lensing sand conditions than by structure.
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