Effective Porosity Formula
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\( n_e \;=\; \dfrac{ V_{ep} }{ V_b }\) (Effective Porosity) \( V_{ep} \;=\; n_e \cdot V_b \) \( V_b \;=\; \dfrac{ V_{ep} }{ n_e }\) |
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| Symbol | English | Metric |
| \( n_e \) = Effective Porosity | \(dimensionless\) | \(dimensionless\) |
| \( V_{ep} \) = Effective Pore Volume | \(in^3\) | \(cm^3\) |
| \( V_b \) = Bulk Volume | \(in^3\) | \(cm^3\) |
Effective porosity, a dimensionless number, is the percentage of the total volume of a rock that is capable of transmitting fluids. It is an important parameter in reservoir engineering and hydrogeology as it determines the capacity of a rock to store and transmit fluids such as oil, gas, or water. Unlike total porosity, which includes all the pore spaces in a rock, effective porosity only considers the interconnected pore spaces that contribute to fluid flow. Effective porosity is typically measured using core samples from the reservoir and analyzing them in a laboratory. It can also be estimated from well logs and other indirect methods. Effective porosity is usually lower than total porosity because not all pore spaces are interconnected or contribute to fluid flow.
