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==Horizontal and vertical k<sub>a</sub>==
==Horizontal and vertical k<sub>a</sub>==
Horizontal K<sub>a</sub> (i.e., parallel to bedding) is generally greater than vertical K<sub>a</sub> (i.e., normal to bedding) because of vertical changes in sorting and because of bedding laminations. High vertical K<sub>a</sub> generally results from fracturing or even burrowing that cuts across bedding. Most K<sub>a</sub> calculations are made from measurements of horizontal plugs.
Horizontal K<sub>a</sub> (i.e., parallel to bedding) is generally greater than vertical K<sub>a</sub> (i.e., normal to bedding) because of vertical changes in [[Core_description#Maturity|sorting]] and because of bedding laminations. High vertical K<sub>a</sub> generally results from fracturing or even burrowing that cuts across bedding. Most K<sub>a</sub> calculations are made from measurements of horizontal plugs.
==Steady-state permeability equation==
==Steady-state permeability equation==