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

$\begin{array}{l}k_{rg}(s)\end{array}$	relative formation permeability to gas
$\begin{array}{l}\mu_g\end{array}$	dynamic viscosity of gas
$\begin{array}{l}s = \{ s_{\alpha}\}\end{array}$	reservoir saturation $\begin{array}{l}\sum_\alpha s_{\alpha} = 1\end{array}$

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