Generation of depositional facies maps using microcomputers and lithocrossplot data, Minnelusa formation, Powder River Basin
A series of depositional facies maps for units within the upper member of the Permo-Pennsylvanian Minnelusa formation was generated using data from core descriptions and geophysical logs in combination with regional isopach maps. Over 1300 ft (396 m) of described core from 22 wells was used to calibrate log readings to the four principal lithologies: anhydrite, dolomite, cross-bedded sandstone, and wavy-bedded sandstone. Log cutoff values for each lithology were derived from core through graphic and statistical analysis routines using standard cross-plots. Over 24,000 ft (7315 m) of synthetic core was generated for 121 uncored wells. Data were analyzed with microcomputers using common software such as LOTUS 1-2-3 and dBASEII. Clastic and carbonate percent maps were made using all 143 control points. Lithofacies work maps were then constructed by overlaying clastic and carbonate percent maps with regional isopachs. Facies interpretations, based on sedimentary features observed in core, were extrapolated to the lithologic sequences in the synthetic cores. These interpretations served as environment constraints in the construction of the final facies maps.
- Research Organization:
- RPI, Boulder, CO
- OSTI ID:
- 6269699
- Report Number(s):
- CONF-8506201-
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Vol. 69:5; Conference: AAPG Rocky Mountain Section meeting, Denver, CO, USA, 2 Jun 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
POWDER RIVER BASIN
MAPPING
STRATIGRAPHY
CORRELATIONS
DATA ANALYSIS
DOLOMITE
DRILL CORES
LITHOLOGY
MICROPROCESSORS
PENNSYLVANIAN PERIOD
PERMIAN PERIOD
SANDSTONES
WELL LOGGING
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
COMPUTERS
ELECTRONIC CIRCUITS
FEDERAL REGION VIII
GEOLOGIC AGES
GEOLOGY
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MICROELECTRONIC CIRCUITS
MINERALS
MONTANA
NORTH AMERICA
OXYGEN COMPOUNDS
PALEOZOIC ERA
ROCKS
SEDIMENTARY ROCKS
USA
WYOMING
020200* - Petroleum- Reserves
Geology
& Exploration