peremability - Permeability The ability of the rock to...

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P ermeability The ability of the rock to transmit fluids, typically measured in Darcies or millidarcies. Formations that transmit fluids readily, such as sandstones, are described as permeable and tend to have many large, well-connected pores. Impermeable formations, such as shales and siltstones, tend to be finer grained or of a mixed grain size, with smaller, fewer, or less interconnected pores. The relative saturations of the fluids as well as the nature of the reservoir affect the effective permeability. Relative permeability is the ratio of effective permeability of a particular fluid at a particular saturation to absolute permeability of that fluid at total saturation. If a single fluid is present in a rock, its relative permeability is 1.0. Calculation of relative permeability allows for comparison of the different abilities of fluids to flow in the presence of each other, since the presence of more than one fluid generally inhibits flow. C lassification o f P ermeability
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A bsolute P ermeability Absolute permeability is the measurement of the permeability conducted when a single fluid, or phase , is present in the rock. The measurement of the permeability, or ability to flow or transmit fluids through a rock, conducted when a single fluid, or phase, is present in the rock . The symbol most commonly used for permeability is k, which is measured in units of Darcies or millidarcies.
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