Study of shelf-slope environments of deposition, High Island A-474/A-499 area
The focus of this study is the High Island A-474/A-499 fields located on the outer continental shelf 80 mi southeast of Galveston, Texas. The primary geologic structure is an elongated northwest-southeast-trending dome associated with a deep-seated shale or salt diapir. The dome is bisected by two large northwest-striking down-to-the-northeast growth faults. The productive intervals range in age from late Pleistocene to late Pliocene. Paleontologic studies indicate the upper and middle Pleistocene sandstones were deposited in an outer shelf environment. These productive layers originated from prograding deltas located to the north, northeast, and southwest, the latter being transported as sand plumes by northeasterly flowing currents. The large growth faults, together with associated secondary faulting, provided the primary trapping mechanism for these reservoirs. Greatest sand accumulation occurred at the intersection of the growth faults and the northeast-trending sand plumes. In contrast, stratigraphic traps are the primary trapping mechanism for the lower Pleistocene and upper Pliocene strata.
- Research Organization:
- Pennzoil Co., Houston, TX (USA)
- OSTI ID:
- 6181512
- Report Number(s):
- CONF-890404-
- Journal Information:
- AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States), Vol. 73:3; Conference: AAPG annual convention with DPA/EMD Divisions and SEPM, San Antonio, TX, USA, 23 Apr 1989
- Country of Publication:
- United States
- Language:
- English
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CONTINENTAL SHELF
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PLEISTOCENE EPOCH
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SALT DEPOSITS
CENOZOIC ERA
CONTINENTAL MARGIN
FEDERAL REGION VI
GEOLOGIC AGES
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GEOLOGIC FRACTURES
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NORTH AMERICA
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USA
020200* - Petroleum- Reserves
Geology
& Exploration