Part of the bulk rock volume $\begin{array}{l}V_r\end{array}$ containing the hydrodynamically connected fluids (also called free fluids) within each pore element:

(1)	$\begin{array}{l}\displaystyle V_\phi = V_r - V_m\end{array}$

where

$\begin{array}{l}V_m\end{array}$

solid rock matrix volume

Although the fluid inside the pore is movable but some pores maybe isolated from each other and do not contribute to rock permeability.

This splits the pore volume $\begin{array}{l}V_\phi\end{array}$ into two components: connected pore volume $\begin{array}{l}V_{\rm con}\end{array}$ and closed pore volume $\begin{array}{l}V_{\rm cls}\end{array}$ :

$\begin{array}{l}\displaystyle V_\phi = V_{\rm con} + V_{\rm cls}\end{array}$

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See also

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Pore volume

See also