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

(1)	$\begin{array}{l}\displaystyle M_{rg}{s} = \frac{k_{rg}}{\mu_g}\end{array}$

where

$\begin{array}{l}k_{rg}\end{array}$	relative formation permeability to gas
$\begin{array}{l}\mu_g\end{array}$	dynamic viscosity of gas
$\begin{array}{l}s\end{array}$	reservoir saturation $\begin{array}{l}\{ s_w, \, s_o, \, s_g \}\end{array}$

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