Alabama-Ferry field, Leon County, Texas: facies types and diagenetic aspects of an Upper Glen Rose stratigraphic trap
Alabama-Ferry field is a mid-shelf cyclic shoal complex located approximately 15 mi (24 km) landward of the Glen Rose shelf margin. Since its discovery in 1983, over 110 wells have been drilled to develop the field and define the limits. The interplay of dominant particle type, texture, and diagenesis controls reservoir quality. Grainstone and some packstone textures composed of skeletal, intraclast, and ooid particle types are the principal reservoir facies. Overall particle composition of grainstone units varies from near-pure end members to various mixed subfacies, with accessory peloids, forams, echinoderm fragments, and others. Grainstone facies belts vary from east to west across the field. Skeletal grainstones dominate the eastern portion of the field in a roughly north-south belt. Intraclast, ooid, skeletal, and mixed grainstone subfacies are spread across the broad western portion of the field. The highest-quality reservoir textural type is skeletal grainstone, with interparticle and well-developed moldic porosity. Intraclast and ooid grainstone end members are good and moderate-to-poor reservoir rock types, respectively, with interparticle and microporosity as the principal pore types. Abundant microporosity, often found within ooids and intraclasts, is associated with relatively higher irreducible water saturations and less-effective pore systems (lower interconnectivity). The overall reservoir quality of different mixed-particle subfacies is generally dependent on the proportion of dissolution-prone skeletal fragments (moldic porosity). The suite of pore types and diagenetic events in Alabama-Ferry field are similar to many Lower Cretaceous carbonate reservoirs in the Gulf Coast province.
- Research Organization:
- Reservoirs, Inc., Houston, TX
- OSTI ID:
- 5992638
- Report Number(s):
- CONF-870606-
- Journal Information:
- AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States), Vol. 71:5; Conference: American Association of Petroleum Geologists annual meeting, Los Angeles, CA, USA, 7 Jun 1987
- Country of Publication:
- United States
- Language:
- English
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Sedimentological cross section of Cambro-Ordovician carbonate shelf (Knox group, Conasauga Formation) in central Alabama: facies, diagenesis, potential reservoirs
Sedimentological cross section of Cambro-Ordovician carbonate shelf (Knox group, Conassauga Formation) in central Alabama: facies, diagenesis, potential reservoirs
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OIL FIELDS
GEOLOGIC TRAPS
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CARBONATE ROCKS
CONGLOMERATES
CRETACEOUS PERIOD
DIAGENESIS
POROSITY
RESERVOIR ROCK
SANDSTONES
FEDERAL REGION VI
GEOLOGIC AGES
GEOLOGIC DEPOSITS
MESOZOIC ERA
MINERAL RESOURCES
NORTH AMERICA
PETROLEUM DEPOSITS
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ROCKS
SEDIMENTARY ROCKS
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