About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

GCAGS Transactions


Gulf Coast Association of Geological Societies Transactions
Vol. 51 (2001), Pages 207-218

Outcrop Analogs for Reservoir Characterization and Modeling of Smackover Microbial Reefs in the Northeastern Gulf of Mexico Area

Ernest A. Mancini, William C. Parcell


Upper Jurassic (Oxfordian) Smackover microbial reef buildups in the northeastern Gulf of Mexico consist primarily of shallow-water thrombolites that develop on hardgrounds or rockgrounds associated with Paleozoic basement paleohighs. These microbolites are typically associated with late transgressive to early highstand systems tract deposits and range from 10 ft (3 m) to 150 ft (45 m) in thickness. Because the Smackover strata are not exposed at the surface in this region, determination of the geometries and extent of these thrombolitic buildups, which are critical to devising hydrocarbon development strategies for these reservoirs, is difficult.

Upper Jurassic (Oxfordian and Kimmeridgian) microbial buildups are exposed in Western Europe where they are also associated with late transgressive to highstand systems tract deposits. In France, these microbial reefs have been observed in outcrop to consist of layered to dendroidal thrombolitic buildups that generally do not exceed 10 ft (3 m) in thickness. In Portugal, microbial reefs consist primarily of thrombolitic buildups that attain thicknesses of 100 ft (30 m). These buildups are associated with sediment starvation surfaces and hardgrounds and occur in early highstand systems tract deposits.

The use of Upper Jurassic microbial reef outcrops in Europe to characterize and model the Smackover thrombolitic reefs in the subsurface of the northeastern Gulf of Mexico greatly facilitates the design of hydrocarbon development strategies for delineating Smackover microbial reefs through 3-D geologic and seismic modeling.

Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Protected Document: $10
Internal PDF Document: $14
Open PDF Document: $24