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→Permeability
===[[Permeability]]===
===[[Permeability]]===
Permeability (''k'') can also be mapped and contoured (see [[Core-log transformations and porosity-permeability relationships]]). As for saturation values, some care must be exercised in mapping permeability because values must be derived from indirect measurements. Typically, permeabilities are derived from wireline log [[Porosity|porosities]] transformed on the basis of core permeability versus porosity cross plots. Permeabilities can be reported at ambient laboratory conditions of pressure or adjusted to reservoir conditions of confining pressure. Similarly, permeabilities can be absolute permeabilities to air (nitrogen) or liquid or effective permeabilities to oil in the presence of irreducible water. Permeability values in an individual well are thickness weighted and typically averaged harmonically, arithmetically, or geometrically, depending on flow geometry. Alternatively, flow capacity (''kH'') values derived from [[pressure transient testing]] can be divided by net pay thickness (''H'') to yield a liquid permeability value for a well.
Permeability (''k'') can also be mapped and contoured (see [[Core-log transformations and porosity-permeability relationships]]). As for [[Water saturation|saturation]] values, some care must be exercised in mapping permeability because values must be derived from indirect measurements. Typically, permeabilities are derived from wireline log [[Porosity|porosities]] transformed on the basis of core permeability versus porosity cross plots. Permeabilities can be reported at ambient laboratory conditions of pressure or adjusted to reservoir conditions of [[confining pressure]]. Similarly, permeabilities can be [[Absolute permeability|absolute permeabilities]] to air (nitrogen) or liquid or [[Effective permeability|effective permeabilities]] to oil in the presence of [[irreducible water]]. Permeability values in an individual well are thickness weighted and typically [[Averaging|averaged harmonically, arithmetically, or geometrically]], depending on [[flow geometry]]. Alternatively, [[flow capacity]] (''kH'') values derived from [[pressure transient testing]] can be divided by net pay thickness (''H'') to yield a liquid permeability value for a well.
===Porosity thickness===
===Porosity thickness===