Sedimentation, Diagenesis and Porosity Evolution of Carbonate Sands in the Black Lake Field of Central Louisiana
J. L. Harbour, R. L. Mathis, 1984. "Sedimentation, Diagenesis and Porosity Evolution of Carbonate Sands in the Black Lake Field of Central Louisiana", Carbonate Sands-A Core Workshop, Paul M. Harris
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Lower Cretaceous skeletal and non-skeletal carbonate sands associated with mud-dominanted, caprinid rudist mounds comprise much of the reservoir facies of the Black Lake Field in central Louisiana. Porosity and permeability distribution within the sand facies is controlled by the original depositional setting and resultant sediment fabric, and the subsequent strati graphic and diagenetic history. The dominant porosity type associated with the sand facies is primary interparticle, and the major porosity occluding mechanism is the presence of a mi critic matrix. Other porosity occluding mechanisms include minor cementation and compaction. Deposition of thick overlying shales, along with updip lagoonal muds, apparently formed a diagenetic seal in the Black Lake Field. This seal prevented the downdip migration of calcite cementing meteoric fluids from entering the reservoir, and resulted in the preservation of most primary interparticle porosity within the carbonate sand facies.
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Carbonate Sands-A Core Workshop
Carbonate sands, both skeletal and non-skeletal, have been studied by geologists as intensely as carbonate buildups. The underlying reason for the studies is the importance of those sands as significant hydrocarbon reservoirs. This core workshop is intended to provide a “hands on” look at the subsurface geologic record of carbonate sands with emphasis on lithofacies, stratigraphy of the sands and surrounding deposits, geometry of the sand deposits, diagenesis and porosity evolution, and wireline log data.