A measure of ability of a porous formation to allow a certain fluid to pass through it: where
\mu
| {\bf v}|
\nabla p
(1)
k = \mu \frac{| {\bf v}|}{ | \nabla p |}
fluid viscosity fluid velocity pressure gradient
Permeability depends on fluid type, filling the porous media and the fluid type which is sweeping through it which leads to splitting its value into a product of two components:
(2) | k = k_a \cdot k_{rf} |
where
k_a | absolute permeability to air which is defined by the reservoir pore structure only, also denoted as k_{abs} or k_{air} |
---|---|
k_r | relative permeability to a given fluid which is defined by the interaction between fluid and reservoir matrix |
See also
Physics / Fluid Dynamics / Percolation
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Field Study & Modelling
[ Petrophysics ] [ Basic reservoir properties ] [ Permeability ] [ Absolute permeability ] [Relative permeability] [ Wettability ]