Accurate well log permeabilities are desirable because logs exist for all wells and because permeability is one of the most important parameters used to define reservoir performance. Standard methods of estimating permeability from well logs are not accurate enough to provide reliable values and are not widely used. Typically, empirical transforms are developed between porosity, irreducible water saturation (Swir) and permeability with the understanding that Swi, reflects internal pore surface roughness It has been possible to predict permeability within a single reservoir without diagenetic alteration or complex pore types, but a dependable permeability estimation technique has been lacking.

Correct permeability estimation can be achieved by well logs with proper selection and calibration of logs by core data. Core porosity and permeability are used to recognize different hydraulic zones.

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