Abstract
Abstract Reservoir characterization of the Haygood Limestone (Ferry Lake Anhydrite, Early Cretaceous) at Caddo-Pine Island field in Caddo Parish, Louisiana, has enhanced the design of a proposed waterflood recovery program. Analyses to evaluate reservoir geology, formation injectivity, porosity types and pore size distributions include conventional core description, thin section petrography, X-ray diffraction, X-ray computed tomography (CT), and petrographic and scanning electron image analysis (PIA and SEM-IA). The Haygood Limestone is a thin, very fine calcarenite to fine calcirudite (intraclast bioclast packstone to grainstone) which is overlain and underlain by bedded anhydrite. The reservoir interval has an average porosity of 17.0%, an average permeability of 10.89 md and is characterized by a homogeneous pore network with a narrow pore size distribution. The base and the top of the Haygood are characterized by thin nonreservoir zones which effectively enhance the in situ stratigraphic trap. These zones possess decreased porosity and permeability and heterogeneous pore networks with broad pore size distributions. Porosity types include interparticle, moldic, intraparticle and microporosity. Interparticle and moldic pores are the dominant pore types, and are variably reduced by bladed to equant calcite and blocky anhydrite cements. Microporosity is locally significant, establishing a bimodal pore system and increasing bound (irreducible) water content.
Published Version
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