Lower and middle Guadalupian shelf carbonates, eastern margin of Central Basin platform, Permian Basin, west Texas
Lower and middle Guadalupian shelf carbonates serve as the reservoir for a nearly continuous band of oil fields extending 100 mi along the eastern margin of the Central Basin platform of west Texas. Approximately 5 billion bbl of oil have been produced from stratigraphic-structural traps within the Upper Permian (Guadalupian Series) dolomites of the San Andres and Grayburg Formations in Upton, Crane, Ector, Pecos, and Andrews Counties, Texas. The San Andres and Grayburg Formations are cyclical shallowing-upward carbonate sequences of open shelf through sabkha facies whose depositional strike parallels the eastern margin of the Central Basin platform. Porosity and permeability of reservoir rock are governed by diagenetic processes such as dolomitization, anhydrite porosity occlusion, leaching, silicification, and authigenic clay formation. San Andres fields (Yates-Harris) have a combined cumulative production exceeding 3 billion bbl of oil. Grayburg fields (McCamey-Fuhrman-Mascho) account for 1.8 billion bbl of oil production. Lowering sea level during the early Guadalupian initiated basinward progradation of San Andres carbonate facies with hydrocarbon reservoirs best developed in shallow shelf fusulinid wackestones to packstone and oolitic grainstone. Reservoir dolomites of the Grayburg formation are present east of San Andres fields with optimal reservoir properties occurring near the San Andres outer shelf margin.
- Research Organization:
- Chevron U.S.A., Midland, TX (USA)
- OSTI ID:
- 5792819
- Report Number(s):
- CONF-880301-
- Journal Information:
- AAPG Bull.; (United States), Vol. 72:2; Conference: Annual meeting of the American Association of Petroleum Geologists, Houston, TX, USA, 20-23 Mar 1988
- Country of Publication:
- United States
- Language:
- English
Similar Records
Similarity of Grayburg/San Andres dolomite reservoirs - Eastern edge of Central Basin platform, Permian basin
McElroy Field, Permian Basin, West Texas: Cyclic sequence dolomite reservoir of Central Basin platform
Related Subjects
PERMIAN BASIN
CARBONATE ROCKS
TEXAS
DIAGENESIS
DOLOMITE
GEOLOGIC FORMATIONS
OIL FIELDS
PERMEABILITY
PERMIAN PERIOD
POROSITY
RESERVOIR ROCK
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
FEDERAL REGION VI
GEOLOGIC AGES
GEOLOGIC DEPOSITS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERAL RESOURCES
MINERALS
NORTH AMERICA
OXYGEN COMPOUNDS
PALEOZOIC ERA
PETROLEUM DEPOSITS
RESOURCES
ROCKS
SEDIMENTARY ROCKS
USA
020200* - Petroleum- Reserves
Geology
& Exploration