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

where

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

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