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Abstract
Chapter from: M
61: Basin Compartments and Seals
Edited by
Peter J. OrtolevaAuthors:
Peter A. Drzewiecki, J. Antonio Simo, P. E. Brown, E. Castrogiovanni,
Gragory C. Nadon, Lisa D. Shepherd, J. W. Valley, M. R. Vandrey, B. L.
Winter, and D. A. Barnes Methodology and Concepts
Published 1994 as
part of Memoir 61
Copyright © 1994 The American Association of Petroleum
Geologists. All Rights Reserved. |
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Chapter 13
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Diagenesis,
Diagenetic Banding, and Porosity Evolution of the Middle Ordovician St.
Peter Sandstone and Glenwood Formation
in the Michigan BasinPeter A. Drzewiecki
J. Antonio Simo
P. E. Brown
E. Castrogiovanni
Gregory C. Nadon
Lisa D. Shepherd
J. W. Valley
M. R. Vandrey
B. L. Winter
University of Wisconsin
Madison, Wisconsin, U.S.A.
D. A. Barnes
Western Michigan University
Kalamazoo, Michigan,
U.S.A.
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ABSTRACT
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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