Cuddy @model

One f the SHF models:

(1)	$\begin{array}{l}\displaystyle s_w(h) = 1 - a \exp \left( -\left(\frac{b}{h-h_{FWL}+c}\right)^d \right)\end{array}$

where model parameters $\begin{array}{l}\{ a, \ b, \ c, \ d \}\end{array}$ are calibrated on water saturation from OH logs for each lithofacies or petrotype individually.

The coefficient $\begin{array}{l}c\end{array}$ is related to FWL correction but usually set the same for all lithofacies / petrotypes of a given reservoir unit.

If core data is abundant then one can build a reasonable correlation of model parameters on porosity and/or permeability:

(2)	$\begin{array}{l}\displaystyle a = a(\phi), \; b = b(\phi), \; c = c(\phi)\end{array}$

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Cuddy @model