Stratigraphy and depositional environments of Glenwood Formation and St. Peter Sandstone in Michigan basin
Natural gas was discovered in a deep sandstone reservoir in the central Michigan basin by the completion of the Dart-Edwards 7-36 in 1980. This discovery initiated extensive deep exploration in a part of the Michigan subsurface that was poorly understood. With more than 100 new deep tests, it is now possible to examine wireline log suites, cuttings samples, and cores to interpret the stratigraphic position and depositional environment of this sand body. The sandstone is a thick (may exceed 1200 ft in the center of the basin) rock body that has been encountered in wells throughout the central and northern Michigan basin. It occurs stratigraphically below a variably thick sequence of interbedded sandstones, shales, and carbonates that grade upward into the lower Black River formation. This interbedded sequence can be correlated with the various members of the Glenwood Formation described from Illinois and Wisconsin. The Glenwood may be conformable or unconformable on top of the sandstone. Since 1980, this sandstone has been called the Jordan Sandstone, the massive sandstone, and most commonly the Prairie du Chien sandstone. Recently, it has been named the Bruggers formation. Because of its stratigraphic position below the Glenwood and its quartzarenite lithology, this sandstone should be called the St. Peter formation. Facies found in this sandstone include beach and bar shoreface environments and intensively burrowed tidal-flat or protected shoreface zones.
- Research Organization:
- Western Michigan Univ., Kalamazoo
- OSTI ID:
- 7052027
- Report Number(s):
- CONF-8610158-
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Vol. 70:8; Conference: AAPG Eastern section meeting, Ann Arbor, MI, USA, 1 Oct 1986
- Country of Publication:
- United States
- Language:
- English
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