A property characterising agility of the water under pressure gradient with account of reservoir permeability and dynamic fluid viscosity:

(1)	$\begin{array}{l}\displaystyle M_w = \frac{k_w}{\mu_w} = k_{air}\cdot M_{rw}\end{array}$

where

$\begin{array}{l}k_w\end{array}$	formation permeability to water
$\begin{array}{l}\mu_w\end{array}$	dynamic viscosity of water
$\begin{array}{l}k_{air}\end{array}$	absolute permeability to air
$\begin{array}{l}k_{rw}\end{array}$	relative formation permeability to water
$\begin{array}{l}\displaystyle M_{rw} = \frac{k_{rw}}{\mu_w}\end{array}$	relative water mobility

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