East Brentwood Gas Field: a paleotopographic trap
The E. Brentwood Gas Field is located ca. 45 miles east of San Francisco, California. The discovery well was drilled in 1978 by Depco, Inc. and completed in the Upper Cretaceous third massive sand at a depth of 8050 ft. The third massive sand is a progradational sequence of sands with thin shale interbeds, interpreted to have been deposited in a near-shore, open-sea environment. The reservoir sand is truncated dramatically by the Meganos Gorge, a shale-filled fossil channel of Paleocene age. Faunal assemblages indicate that the cutting and filling of the gorge were submarine rather than subaerial. The E. Brentwood Gas Field is controlled primarily by the truncation of the basal part of the third massive sand by the Meganos Gorge shale fill with lateral closure afforded by several normal faults which divide the field into at least 4 separate producing blocks. Nine wells presently are completed in the gas field in which the better wells have over 250 ft of net gas sand. The field has produced 19 billion cu ft of 1080 Btu gas and 50,000 bbl of 46 API gravity condensate since discovery.
- OSTI ID:
- 5632602
- Report Number(s):
- CONF-8206143-
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Vol. 66:5; ISSN AAPGB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
030200* -- Natural Gas-- Reserves
Geology
& Exploration
030300 -- Natural Gas-- Drilling
Production
& Processing
API GRAVITY
CALIFORNIA
CONDENSATES
CRETACEOUS PERIOD
DENSITY
FEDERAL REGION IX
FLUIDS
GAS CONDENSATES
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOLOGY
LIQUIDS
MESOZOIC ERA
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NATURAL GAS LIQUIDS
NATURAL GAS WELLS
NORTH AMERICA
PHYSICAL PROPERTIES
PRODUCTION
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SHALES
USA
WELLS