Ineffective Porosity Formula
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\( n_i \;=\; \dfrac{ V_{dp} }{ V_b }\) (Ineffective Porosity) \( V_{dp} \;=\; n_i \cdot V_b \) \( V_b \;=\; \dfrac{ V_{dp} }{ n_i }\) |
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| Symbol | English | Metric |
| \( n_i \) = Ineffective Porosity | \(dimensionless\) | \(dimensionless\) |
| \( V_{dp} \) = Volume of Completely Disconnected Pores | \(in^3\) | \(cm^3\) |
| \( V_b \) = Bulk Volume | \(in^3\) | \(cm^3\) |
Ineffective porosity, abbreviated as \( n_i \), a dimensionless number, is the portion of the porosity within a reservoir rock that does not contribute to the storage and flow of fluids, such as oil, gas, or water. The following types of porosity do not contribute to the effective porosity, which is the porosity that actually contributes to the reservoir's ability to store and transmit fluids. Understanding the distinction between effective and ineffective porosity is crucial for accurate reservoir characterization and for making informed decisions regarding reservoir management and production strategies.
