Porosity by using density log data

Input(s)

$\rho_{b}$: Bulk Density $\left(\mathrm{g} / \mathrm{cm}^{3}\right)$

$\rho_{m a}$: Matrix Density $\left(\mathrm{g} / \mathrm{cm}^{3}\right)$

$\rho_{f}$: Average Fluid Density in Pore Spaces $\left(\mathrm{g} / \mathrm{cm}^{3}\right)$

Output(s)

$\Phi$: Porosity (fraction)

Formula(s)

$$ \Phi=\frac{\rho_{m a}-\rho_{b}}{\rho_{m a}-\rho_{f}} $$

Reference(s)

Bassiouni, Z., 1994, Theory, Measurement, and Interpretation of Well Logs. SPE Textbook Series Vol. 4. Chapter 8, Page: 165.