Facies identification based on conventional core-log integration: Middle Ordovician St. Peter sandstone, Michigan basin

Conference · Tue Aug 01 00:00:00 EDT 1989 · AAPG Bulletin (American Association of Petroleum Geologists); (USA)

OSTI ID:5661309

Wieczorek, L M; Barnes, D A ^[1]

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1. Western Michigan Univ., Kalamazoo (USA)

Lithofacies comprising the massive sand in the Michigan basin are very similar to the lithofacies of the St. Peter Sandstone in parts of the adjacent Midwestern basin and arches region. Lithostratigraphic and biostratigraphic correlations justify application of the name St. Peter Sandstone to the gas-productive massive sand in the Michigan basin. Four lithofacies have been determined by core-log integration. The two lowermost lithofacies (1 and 2) were deposited in marginal-marine peritidal shoreface to sand-flat environments. Lithofacies 1A comprises cross-bedded, quartz-cemented quartzarenites. Lithofacies 1B comprises dolomitic, cross-bedded, subfeldspathic arenites. Lithofacies 1A is recognized in logs by low gamma-ray response (less than 20-25 API units) and photoelectric effect (Pe) of 1.8. Lithofacies 1B log characteristics include low gamma ray response (15-30 API units) and Pe of 2-2.5. Lithofacies 2 log signatures include moderate to high gamma-ray (30-120 API units) and Pe values that range from 2.5-3.5. The uppermost two lithofacies (3 and 4) were deposited in storm-dominated lower shoreface, to offshore, to distal marine shelf environments. Lithofacies 3 consists of burrowed, massive, wavy to planar stratified quartzarenites to subfeldspathic arenites. Log signature is generally low gamma-ray response (15-30 API units) and Pe that ranges from 1.8 to 2.5. Lithofacies 4 consists of massive, burrowed and bioturbated, dominantly authigenic clay and dolomite-cemented subfeldspathic arenite. Lithofacies 4 log response is moderate to high gamma-ray response (30-105 API units) and Pe ranging from 2.25 to 3.5.

• OSTI ID: 5661309
• Report Number(s): CONF-8909166-; CODEN: AABUD
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (USA), Vol. 73:8; Conference: American Association of Petroleum Geologists (AAPG) eastern section meeting, Blommington, IN (USA), 10-13 Sep 1989; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
MICHIGAN
PETROLEUM DEPOSITS
RESERVOIR ROCK
DEPOSITION
FELDSPARS
GEOLOGIC FORMATIONS
LITHOLOGY
ORDOVICIAN PERIOD
QUARTZ
SANDSTONES
SEDIMENTARY BASINS
CHALCOGENIDES
FEDERAL REGION V
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
MINERAL RESOURCES
MINERALS
NORTH AMERICA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PALEOZOIC ERA
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SILICON COMPOUNDS
SILICON OXIDES
USA
020200* - Petroleum- Reserves
Geology
& Exploration