k_f = \mu_f \frac{| {\bf v}|}{ | \nabla p |} |
where
| fluid viscosity | |
| fluid velocity | |
| pressure gradient |
A measure of ability of a porous formation to allow a certain fluid to pass through it:
where
|
| Symbol | Dimension | SI units | Oil metric units | Oil field units |
|---|---|---|---|---|
| L2 | m2 | md |
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:
k_f = k_a \cdot k_{rf} |
where
absolute permeability to air which is defined by the reservoir pore structure only, also denoted as | |
relative permeability to a given fluid which is defined by the interaction between fluid and reservoir matrix |
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petrophysics
[Absolute permeability] [Relative permeability]