Deposition, diagenesis, and porosity development in Mississippian Castle Reef formation, northwestern Montana
Conference
·
· Am. Assoc. Pet. Geol., Bull.; (United States)
OSTI ID:6962985
The Castle Reef formation forms the top of the Mississippian Madison Group in the Sawtooth Range of northwestern Montana and consists principally of dolograinstones, packstones, and wackestones that are disconformably overlain by Jurassic strata. The Caste Reef attains a maximum thickness of 145 m (476 ft) and can be subdivided into shoal, intershoal, shoal to open-platform, and open to restricted-platform facies representing an upward-shoaling sequence. Microprobe elemental analyses, cathodoluminescence and transmitted-light microscopy, and facies interpretation suggest primary intergranular porosities were destroyed soon after deposition by syntaxial overgrowths. Secondary moldic porosity with limpid equant and drusy cements developed along with destruction of primary porosity in the freshwater phreatic zone. Microprobe magnesium-calcium ratios of these cements and allochemical components range from 1:1.0 to 1:1.6, suggesting that mixing zone dolomitization occurred after cementation, probably by the Late Mississippian. Further cementation of porosity at depth after dolomitization was prohibited by hydrocarbon migration considered to be sourced from Devonian.
- Research Organization:
- Univ. of Idaho, Moscow
- OSTI ID:
- 6962985
- Report Number(s):
- CONF-8609129-
- Conference Information:
- Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 70:8
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
DEPOSITION
DIAGENESIS
DOLOMITE
FEDERAL REGION VIII
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERAL RESOURCES
MINERALS
MISSISSIPPIAN PERIOD
MONTANA
NATURAL GAS DEPOSITS
NORTH AMERICA
OXYGEN COMPOUNDS
PALEOZOIC ERA
PETROLEUM DEPOSITS
POROSITY
RESERVOIR ROCK
RESOURCES
USA
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
DEPOSITION
DIAGENESIS
DOLOMITE
FEDERAL REGION VIII
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERAL RESOURCES
MINERALS
MISSISSIPPIAN PERIOD
MONTANA
NATURAL GAS DEPOSITS
NORTH AMERICA
OXYGEN COMPOUNDS
PALEOZOIC ERA
PETROLEUM DEPOSITS
POROSITY
RESERVOIR ROCK
RESOURCES
USA