(1)	$\begin{array}{l}\displaystyle p(z) = p_{\rm dat} + GP \cdot (z - z_{\rm dat})\end{array}$

where

$\begin{array}{l}p(z)\end{array}$	reservoir pressure at $\begin{array}{l}(x, \, y, \, z )\end{array}$ location
$\begin{array}{l}p_{\rm dat}\end{array}$	equivalent reservoir pressure at Datum
$\begin{array}{l}z\end{array}$	TVDss of the formation unit
$\begin{array}{l}z_{\rm dat}\end{array}$	Datum
$\begin{array}{l}GP\end{array}$	hydrostatic pressure gradient

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