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in the Michigan Basin
Peter A. Drzewiecki
The Middle Ordovician St. Peter Sandstone and Glenwood Formation of the Michigan basin are composed of alternating intervals of quartz sandstone, micritic carbonate, and an occasional thin shale. They contain abnormally pressured compartments in the deepest portion of the basin. Some of these pressure compartments are gas reservoirs and are bounded, above and below, by diagenetically banded sandstone and/or carbonate sedimentary units.
Diagenetically banded sandstones are dominated by bands of quartz cement that formed as a result of chemical compaction, quartz dissolution, and quartz precipitation during burial. Petrographic and geochemical data suggest that quartz overgrowths precipitated from fluids with a slight meteoric component. Dolomite, the second most abundant authigenic mineral in diagenetic bands and elsewhere in the St. Peter and Glenwood, postdated quartz overgrowths and precipitated from hypersaline fluids at high temperatures. Values of d13C from the dolomite indicate that the carbon was partially derived from the maturation of organic matter, and the carbon isotopic composition appears to be stratigraphically controlled. Bands of dolomite
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