The pressure interference test with multiple homogeneous layers honours the following equations:

(1)	$\begin{array}{l}\displaystyle \left< \sigma \right > = \sum_m \sigma_m\end{array}$

(2)	$\begin{array}{l}\displaystyle \left< c_t \phi h A\right > = \sum_m c_{tm} \phi_m h_m A_m\end{array}$

where

$\begin{array}{l}m\end{array}$	number of layers
$\begin{array}{l}\left< \sigma \right >\end{array}$	transmissibility of the multilayer system
$\begin{array}{l}\left< c_t \, \phi \, h \, A \right>\end{array}$	total storage of the multilayer system
$\begin{array}{l}\sigma_m = \alpha_m h_m\end{array}$	transmissibility of the $\begin{array}{l}m\end{array}$ -th layer
$\begin{array}{l}A_m\end{array}$	reservoir area of the $\begin{array}{l}m\end{array}$ -th layer
$\begin{array}{l}h_m\end{array}$	reservoir thickness of the $\begin{array}{l}m\end{array}$ -th layer
$\begin{array}{l}\alpha_m = k_m \alpha_{rm}\end{array}$	reservoir mobility of the $\begin{array}{l}m\end{array}$ -th layer
$\begin{array}{l}k_m\end{array}$	reservoir permeability of the $\begin{array}{l}m\end{array}$ -th layer
$\begin{array}{l}\alpha_{rm} =\left< \frac{k_r}{\mu} \right>_m\end{array}$	reservoir mobility of the $\begin{array}{l}m\end{array}$ -th layer
$\begin{array}{l}\phi_m\end{array}$	reservoir porosity of the $\begin{array}{l}m\end{array}$ -th layer
$\begin{array}{l}c_{tm}\end{array}$	total compressibility of the $\begin{array}{l}m\end{array}$ -th layer

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