Development of Lower Mississippian cyclic carbonates, Montana and Wyoming
Conference
·
· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
OSTI ID:5955116
The Lower Mississippian Lodgepole/Madison formations of Wyoming and Montana consist of a 20 to 300-m upward-shallowing sequence of cyclic slope/basin, deep-ramp to shallow-ramp carbonate deposits. Shallow-ramp cycles (1-3 m) are composed of cross-bedded oolitic grainstone and pellet grainstone, overlain by rare algal laminite caps. Deep-ramp cycles (1-10 m) are characterized by thin-bedded, substorm-wave-base limestone/shale, nodular limestone/shale, and storm-deposited limestone overlain by hummocky cross-stratified grainstone caps. Average periods of the cycles range from 35,000 to 110,000 years. Slope/basin deposits are 10 to 20-cm thick couplets of even-bedded, micritic limestone and shale. Computer modeling of the cycles incorporates fluctuating sea level, subsidence, depth-dependent sedimentation, lag time, and platform slope. Data from spectral analysis (basin/slope couplets), Fischer plots (shallow-ramp cycles), computer modeling, and field data suggest (1) subsidence rates across the 700-km wide platform range from 0.01 m/k.y. to 0.12 m/k.y., (2) high-frequency (10/sup 4/-10/sup 5/ years) sea level fluctuations with 15 to 25-m amplitudes affected the platform, and (3) shallow-ramp slopes were less than 2 cm/km and deep-ramp slopes were greater than 10 cm/km. Computer models produce stratigraphic sections (one-dimensional models) that graphically illustrate how input parameters interact through time to produce the cyclic stratigraphic section.
- Research Organization:
- Virginia Polytechnic Institute, Blacksburg (USA)
- OSTI ID:
- 5955116
- Report Number(s):
- CONF-890404-
- Conference Information:
- Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) Journal Volume: 73:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
CARBONATE ROCKS
FEDERAL REGION VIII
GEOLOGIC AGES
GEOLOGIC STRUCTURES
GEOLOGY
MATHEMATICAL MODELS
MISSISSIPPIAN PERIOD
MONTANA
NORTH AMERICA
PALEOZOIC ERA
RESERVOIR ROCK
ROCKS
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
STRATIGRAPHY
USA
WYOMING
020200* -- Petroleum-- Reserves
Geology
& Exploration
CARBONATE ROCKS
FEDERAL REGION VIII
GEOLOGIC AGES
GEOLOGIC STRUCTURES
GEOLOGY
MATHEMATICAL MODELS
MISSISSIPPIAN PERIOD
MONTANA
NORTH AMERICA
PALEOZOIC ERA
RESERVOIR ROCK
ROCKS
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
STRATIGRAPHY
USA
WYOMING