Alabama-Ferry field, Leon County, Texas: facies types and diagenetic aspects of an Upper Glen Rose stratigraphic trap

Conference · Fri May 01 04:00:00 EDT 1987 · AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)

OSTI ID:5992638

Lomando, A J; Roy, D L; Bruno, L

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-
• Conference Information: Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) Journal Volume: 71:5
• Country of Publication: United States
• Language: English

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CRETACEOUS PERIOD
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GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC TRAPS
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