| (1) | RQI=0.0314 \, \sqrt{\frac{k}{\phi_e - \phi_0}} |
where
k | absolute permeability to air, md |
\phi_e | effective porosity |
\phi_0 | porosity cut-off |
Unit = μm
This value accounts for monotonous growth of permeability on porosity and the square root decreases the variability thus increasing linearity of correlation between RQI and porosity (usually normalised porosity, see Flow Zone Indicator (FZI)).
See also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petrophysics
[ Flow Zone Indicator (FZI) ] [ Absolute permeability @model ]