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

(1)	$\begin{array}{l}\displaystyle M_o = \frac{k_o}{\mu_o} = k_{air}\cdot M_{ro}\end{array}$

where

$\begin{array}{l}k_o\end{array}$	formation permeability to oil
$\begin{array}{l}\mu_o\end{array}$	dynamic viscosity of oil
$\begin{array}{l}k_{air}\end{array}$	absolute permeability to air
$\begin{array}{l}k_{ro}\end{array}$	relative formation permeability to oil
$\begin{array}{l}\displaystyle M_{ro} = \frac{k_{ro}}{\mu_o}\end{array}$	relative oil mobility

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