Many investigators have attempted to correlate permeability to porosity, grain size and shape, and packing. The most frequently used relation was developed by Kozeny as follows:
k = Φ3/ (5×Sv× (1-Φ)2)
k = permeability, cm2 (= 1.013 x 108 Darcies)
Φ = effective porosity
Sv = total grain surface/unit volume of reservoir, cm2/cm3
The following images show the relationship of grain size and sorting & to porosity and permeability.
porosity, permeability and grain size. Porosity is not affected by grain size but permeability increases with increase in grain size.
Porosity and permeability are affected by sorting, both increases with better sorting.
