Abstract

Reservoirs in the Trenton Limestone and the Black River Group (Limestone) both Upper Ordovician) in Indiana, Michigan, and Ohio formed a major oil province that increased rapidly in importance beginning in 1884. This province became America’s first giant oilfield and has yielded more than 600 MBO, including that produced from the giant Albion-Scipio Trend (120 MBO), which was discovered in 1956. Trenton and Black River carbonates have always excited exploration interest, but very little was known about the nature and distribution of their reservoirs. Recent research on the nature of reservoir development in these units indicates that they do not contain any depositional porosity in the Great Lakes area. Reservoirs are found only where there has been dolomitization or fracturing or some combination of the two.

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