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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
Formation and Evolution of Steep Marginal Slope Deposits in the Bahamas: Insight into the Reservoir Potential and Distribution of Slope Deposits in the Permian Basin
Abstract
Recent studies have shown that the steep (35-45°) marginal slopes surrounding the Bahama Platform consist of laterally heterogeneous lenses of coarse-grained skeletal material that were deposited during the transgressive phase of the latest sea level rise. The high initial porosity and permeability typical of the foreslope deposits was, however, rapidly occluded by precipitation of marine, pore-filling botryoidal aragonite and Mg-calcite cements. Precipitation of these cements has been shown to occur within a few hundred years of deposition, and may affect further diagenetic modification of these deposits through the reduction in permeability. The sedimentary fabric, geometry, and scale documented in the lateral heterogeneity of foreslope deposits in the Bahamas, coupled with localized rapid occlusion of primary porosity and permeability, are both significant findings for development of hydrocarbon reservoirs in these types of deposits, as the reservoirs may be characterized by discontinuous flow units of high porosity and permeability separated by lower permeability baffles and barriers to flow.
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