Humble equation (formation resistivity factor vs porosity)

Input(s)

$\Phi$: Porosity (dimensionless)

Output(s)

F: Formation Resistivity Factor (dimensionless)

Formula(s)

$$ F=\frac{0.62}{(\Phi)^{2.15}} $$

Reference(s)

Bassiouni, Z., 1994, Theory, Measurement, and Interpretation of Well Logs. SPE Textbook Series Vol. 4. Chapter 1, Page: 8 .