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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Cementation reduces porosity and permeability, and modifies pore geometry. Cementation also increases bulk density, compressive strength, tensile strength, modulus of elasticity, and sonic conductivity. These properties vary with the amount and type of cement as well as the location of cement, at least for small amounts of cement. Crystal growth at pore apertures has a pronounced influence on permeability, rock strength, and sonic conductivity. The amount, type, and nature of the cement affect wireline log response, upon which many decisions are based.
Major mineral cements in sandstones are quartz, carbonates (calcite, dolomite-ankerite, and siderite), clay minerals, anhydrite-gypsum, and zeolites. Growth habits, crystal shape, crystal size, and location of crystals within the pore system influence pore geometry. Tabular micropores commonly occur among the cement crystals. The nature of the cement affects tortuosity and rugosity.
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