A measure of ability of a porous formation to allow a certain fluid to pass through it.
| Symbol | Dimension | SI units | Oil metric units | Oil field units | ||||
|---|---|---|---|---|---|---|---|---|
| L2 | m2 | md |
For the laminar flow:
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where
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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:
| LaTeX Math Block | ||||
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k = k_a \cdot k_r |
where
| absolute permeability to air which is defined by the reservoir pore structure only, also denoted as
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| relative permeability to a given fluid which is defined by the interaction between fluid and reservoir matrix |
In general case, permeability is anisotropic both in vertical and lateral directions and quantified by symmetric tensor value:
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If not mentioned otherwise the permeability usually means absolute horizontal permeability:
| LaTeX Math Inline | ||
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See also
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Natural Science / Physics / Fluid Dynamics / Percolation
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[ Petrophysics ] [ Basic reservoir properties ] [ Wettability ] [ Permeability ] [ Absolute permeability ] [ Horizontal permeability ] [ Vertical permeability ] [ kv/kh ]