--> Abstract: Depositional Models for Intraslope Basins: Variability and Controls, by J. D. Boyd, M. J. Mayall, and C. A. Yeilding; #90987 (1993).

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BOYD, J. DOUGLAS, MICHAEL J. MAYALL, and CINDY A. YEILDING, BP Exploration Inc., Houston, TX

ABSTRACT: Depositional Models for Intraslope Basins: Variability and Controls

New well and seismic data reveal a wide range in depositional style and process within Miocene through Pleistocene intraslope basin sediments in the deep water Gulf of Mexico. Depositional models illustrating these are presented and discussed.

Sands deposited within intraslope basins are predominantly turbidites. They can form basinwide sheets, ponded sheets or channel fills (leveed and unleveed) of various scales, occurring also in levees and in subsequently slumped units (some mounded). Signigicant muddy sand debris flows and bottom current reworked sands are also recognized. Each type of sand development carries its own implications for reservoir geometry and effectiveness and for stratigraphic trapping potential.

Intraslope basin mudstone deposition is dominated by turbidity currents and hemipelagic fall- out, their respective contributions generally dIfficult to assess. Distinct drape units are also evident, and both intra-basin and larger scale slumps.

Sedimentation in any intraslope basin is controlled principally by its bathymetric expression and the type, volume and process of sediment supply to it. These factors in turn depend on complex interactions between halokinesis and the regional-to-local scale behavior of depostional systems.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.