Phillips equation (sandstones)

Input(s)

$\Phi$: Porosity (dimensionless)

Output(s)

F: Formation Resistivity Factor (dimensionless)

Formula(s)

$$F=\frac{1.45}{(\Phi)^{1.54}}$$

Reference(s)

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