Part of the bulk rock volume volume
containing the hydrodynamically connected fluids (also called free fluids) within each pore element .with total volume LaTeX Math Inline body V_r
:LaTeX Math Inline body V_f
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\phi_e = \frac{V_f}{V_r} |
Although the fluid inside the pore is movable but some pores maybe isolated from each other and do not contribute to rock permeability.
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