| (1) | k = 1014.24 \, FZI^2 \, \frac{\phi^3}{( 1 - \phi )^2} |
where
This correlation was historical the first physical permeability model, based on the fluid flow in porous media with simplified structure consisted of a bunch of independent capillaries with various diameters.
Later on it's been upgraded to percolation through inter-grain porous space which specifies the FZI as a function of grains shape, size distribution and packing.
See also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petrophysics / Absolute permeability / Absolute permeability @model