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The pinnacle reefs of the Michigan Basin form small, isolated hydrocarbon reservoirs encased in impermeable evaporites and mudstones, and account for most of Michigan’s hydrocarbon reserves. The temporal relations between the reef sequence and the evaporites are still in dispute, but in the currently favored model, deposition of reefs and evaporites follow each other closely in a cyclic manner but are not synchronous. Pinnacle development occurred in four stages and included periods of subaerial exposure, which enhanced reef porosity and permeability through leaching and dolomitization. Subsequent evaporite precipitation filled much of this porosity; many reefs are completely salt plugged and...

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