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), Journal Name: AAPG Bull.; (United States) Vol. 72:2; ISSN AABUD
- 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
020200* -- Petroleum-- Reserves
Geology
& Exploration
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
DIAGENESIS
DOLOMITE
FEDERAL REGION VI
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERAL RESOURCES
MINERALS
NORTH AMERICA
OIL FIELDS
OXYGEN COMPOUNDS
PALEOZOIC ERA
PERMEABILITY
PERMIAN BASIN
PERMIAN PERIOD
PETROLEUM DEPOSITS
POROSITY
RESERVOIR ROCK
RESOURCES
ROCKS
SEDIMENTARY ROCKS
TEXAS
USA