POTENTIAL IN SUB-DEVONIAN STRATA LISTED FOR ILLINOIS, KENTUCKY, INDIANA

Stephen T. Whitaker IBEX Geological Consultants Champaign, Ill. More than 4.2 billion bbl of oil have been produced in the Illinois basin (Fig. 1) since hydrocarbons were first discovered there more than 100 years ago. Roughly three-fourths of this production has come from 58 different pay zones in Illinois (Fig. 2), but only four of these zones are in strata older than Devonian. One major reason for this limited sub-Devonian production is that there are relatively few holes that penetrate the

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