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,...