Abstract
A brief examination of a few cores from deep exploration wells in the central Michigan basin indicates that the preservation and development of porosity and permeability in the Bruggers sandstone are a combination of provenance, depositional environment, diagenesis, and possibly tectonics. However, the most important factors appears to be clay distribution. Disseminated illite-chlorite clays occur as thin, depositional and diagenetic coatings or linings on the quartz grains that preserve original primary porosity by inhibiting compaction and silica cementation. Other less important factors include textural maturity, feldspar overgrowths and subsequent dissolution, dolomite cementation, and possible fractures. These observations highlight some obvious controlling factors, but a more methodical and comprehensive investigation with more widely distributed data is required to answer the many remaining questions regarding the distribution and prediction of reservoir-quality porosity and permeability within the Bruggers formation.
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