Derivation of Material Balance Pressure @model


$\begin{array}{l}\phi_n(p) = \phi_e(p)/\phi_{ei}\end{array}$	normalized porosity
$\begin{array}{l}\phi(p) =\end{array}$	effective porosity as function of formation pressure $\begin{array}{l}p(t)\end{array}$	$\begin{array}{l}Q^{\downarrow}_{GC}(t)\end{array}$	cumulative gas influx from Gas Cap Expansion
$\begin{array}{l}\phi_{ei} = \phi_e(p_i)\end{array}$	initial effective porosity
		$\begin{array}{l}Q^{\downarrow}_{AQ}(t)\end{array}$	cumulative water influx from Aquifer Expansion
		$\begin{array}{l}R_{sp}, \; R_{vp}\end{array}$	normalized cross-phase exchange derivatives as functions of reservoir pressure $\begin{array}{l}p\end{array}$ and temperature $\begin{array}{l}T\end{array}$
	Initial water saturation	$\begin{array}{l}RFO, \, RFG\end{array}$	Oil and Gas Recovery Factor

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