Papers by Banfield, L.A.

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Banfield, L.A. and Anderson, J.B. . 1997. Variability in lowstand depositional environments; examples from the northern Gulf of Mexico help in the search for lowstand reservoirs.. American Association of Petroleum Geologists 1997 annual convention, Dallas, TX, United States: pp.7.
Over 20,000 km of high-resolution seismic data (40-2000 Hz) and hundreds of platform boring descriptions and samples have been analyzed in the northern Gulf of Mexico (offshore Texas, Louisiana, Alabama, and Florida) to reconstruct the depositional environments during the most recent lowstand in sea level. The lowstand units are interpreted to lie between the oxygen isotope Stage 2 sequence boundary (approximately 18,000 yr BP) and the oxygen isotope Stage 2 to 1 transgressive surface. Our study demonstrates a large amount of lateral variability in Lowstand depositional environments and corresponding deposits in the northern Gulf of Mexico. The deposits include sand-dominated and mud-dominated prograding complexes, wedges, and thin units characterized by periods of erosion and nondeposition. Sediments vary in thickness from 75 meter thick delta lobes offshore east and south Texas to thin mud drapes of negligible thickness off the central Texas shelf. The variability in the lowstand depositional environments appears to be controlled by sediment supply, shelf gradient and width, and tectonics. Understanding the contributions of different combinations of controlling factors in the various Lowstand depositional environments along the northern Gulf of Mexico, allows the development of depositional models to predict lowstand reservoir character and distribution in ancient strata.
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