Exploration in Ordovician of central Michigan Basin
Deep wells in the central Michigan basin have provided sufficient data to define two new mappable formations - the Foster Formation and the Bruggers Formation. Recent conodont studies have corrected the age assignments of the strata containing these formations. Previously, the lower section (Foster) was classified as mostly Cambrian, and the upper unit (Bruggers) was identified as Early Ordovician. Conodont identifications indicate an Early and Middle Ordovician age for the Foster Formation and a Middle Ordovician age for the Bruggers Formation. The Michigan basin existed in embryonic form in the Late Cambrian, but the full outline of the present-day basin did not develop until Early Ordovician. Gas and condensate are produced from the Bruggers Formation as deep as 11,252 ft (3429 m). Geothermal investigations suggest that gas production is possible to the base of the Paleozoic section in the central basin (17,000 ft or 5181 m). Paleotemperatures were higher during the Paleozoic owing to 3000-4000 ft (914-1291 m) of additional sedimentary cover. Five wells are producing from the Bruggers Formation. All are deeper tests in anticlines producing from Devonian reservoirs discovered earlier. The structures are the result of vertical movements of basement fault blocks activated by regional stresses. 12 figures, 2 tables.
- Research Organization:
- Michigan State Univ., East lansing
- OSTI ID:
- 5922626
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Vol. 69:12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MICHIGAN
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
EXPLORATION
CAMBRIAN PERIOD
GEOLOGIC FORMATIONS
GEOLOGIC STRUCTURES
ORDOVICIAN PERIOD
RESERVOIR ROCK
WELL DRILLING
DRILLING
FEDERAL REGION V
GEOLOGIC AGES
GEOLOGIC DEPOSITS
MINERAL RESOURCES
NORTH AMERICA
PALEOZOIC ERA
RESOURCES
USA
020200* - Petroleum- Reserves
Geology
& Exploration