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  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

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The rate of [[Hydrocarbon migration|migration]] for [[oil]] or [[gas]] can be estimated using [[Fluid flow fundamentals|Darcy's law]], the principal formula for calculating [[permeability]]. Darcy's law generally holds for rocks with tube-shaped pore systems; however, it is only an approximation for flow in rocks with high percentages of [[clay]]s, like [[shale]]s, due to the platey grain shape of the clays. The [[Wikipedia:Kozeny–Carman equation |Kozeny–Carman correction]] estimates the [[permeability]] of rocks with high percentages of clays.

The rate of [[Hydrocarbon migration|migration]] for [[oil]] or [[natural gas|gas]] can be estimated using [[Fluid flow fundamentals|Darcy's law]], the principal formula for calculating [[permeability]]. Darcy's law generally holds for rocks with tube-shaped pore systems; however, it is only an approximation for flow in rocks with high percentages of [[clay]]s, like [[shale]]s, due to the platey grain shape of the clays. The [[Wikipedia:Kozeny–Carman equation |Kozeny–Carman correction]] estimates the [[permeability]] of rocks with high percentages of clays.

==Procedure==

==Procedure==