Oils and Source Rocks of Niagaran Reefs (Silurian) in the Michigan Basin
W. C. Gardner, E. E. Bray, 1984. "Oils and Source Rocks of Niagaran Reefs (Silurian) in the Michigan Basin", Petroleum Geochemistry and Source Rock Potential of Carbonate Rocks, James G. Palacas
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Potential source rocks were selected from some 300 Silurian core samples by measurements of total organic carbon. Characterization of 60 Michigan basin oils by use of infrared-absorption spectra and carbon-isotope data indicates that the group of oils produced from Niagaran reefs are unique and distinct from other oils in the Michigan basin. Correlation of the oils with potential source-rock kerogen by use of carbon-isotope data indicates that carbonaceous, laminated, interreef Salina A-1 carbonates are the principal source rocks, with the upper algal or "Brown Niagaran" facies of the reef itself constituting a subordinate source. Both facies were deposited in a mesosaline environment, i.e., in waters more saline than normal marine but insufficiently concentrated to precipitate calcium sulfate.