"Permeability" is measure of a porous rock system how easily it allows fluids to move through it. The common unit of permeability is "milli darcy", represented by "mD". Figure-1 illustrates the fluid flow path through the effective pore spaces.
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| Figure-1 |
A rock can be highly porous, that is have high porosity, but may have low permeability or vice-verse.
"Absolute Permeability" is the permeability in a porous medium as such sand stone for a single fluid like oil or water.
"Effective Permeability" is the permeability of a given fluid (such as oil or water or gas) in presence of another fluid in a porous medium.
"Relative Permeability" is the ratio of "Effective Permeability" for a given fluid in presence of another fluid to the absolute permeability of the porous medium.
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