Lower Cretaceous and Upper Jurassic oil reservoirs of the updip basement structure play: Southwest Alabama

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · AAPG Bulletin

OSTI ID:150569

Mink, R M; Mancini, E A ^[1]

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1. Geological Survey of Alabama, Tuscaloosa, AL (United States)

Exploration for Lower Cretaceous and Upper Jurassic reservoirs associated with updip basement structures currently is the most active exploratory oil play in Alabama. High initial flow rates, on the order of hundreds to thousands of barrels of oil per day, are commonly encountered at depths between 8,200 and 14,500 feet. Fifty-one fields have been established and 25 million barrels of oil have been produced from these fields developed in Lower Cretaceous Hosston and Upper Jurassic Haynesville, Smackover, and Norphlet reservoirs. Production from Smackover carbonates began at Toxey field in 1967 and from Haynesville sandstones at Frisco City field in 1986. As of September 1994, Smackover wells averaged 88 barrels of oil per day and Haynesville wells averaged 284 barrels of oil per day. In 1994, production was established in the Norphlet at North Excel field and in the Hosston at Pleasant Home field. Reservoirs in the updip basement structure play cluster in three distinct areas; (1) a western area on the Choctaw ridge complex, (2) a central area on the Conecuh ridge complex, and (3) an eastern area in the Conecuh embayment. Reservoir lithologies include Smackover limestones and dolostones and Hosston, Haynesville, Smackover, and Norphlet sandstones. Hydrocarbon traps are structural or combination traps where reservoirs occur on the flanks or over the crests of basement palohighs. An understanding of the complex reservoir properties and trap relationships is the key to successful discovery and development of Lower Cretaceous and Upper Jurassic oil reservoirs of the updip basement structure play of southwest Alabama.

• OSTI ID: 150569
• Report Number(s): CONF-9510222--
• Journal Information: AAPG Bulletin, Journal Name: AAPG Bulletin Journal Issue: 10 Vol. 79; ISSN 0149-1423; ISSN AABUD2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
ALABAMA
CRETACEOUS PERIOD
EXPLORATION
GEOLOGIC STRUCTURES
GEOMETRY
JURASSIC PERIOD
OIL FIELDS
PETROLEUM
PETROLEUM DEPOSITS
PRODUCTION
RESERVOIR ROCK