Relationship between rock resistivity and water saturation

Input(s)

F: Formation Resistivity Factor (dimensionless)

$R_{w}$: Formation Water Resistivity (ohm m)

$R_{t}$: Rock Resistivity (ohm m)

$\mathrm{n}$: Saturation Exponent (dimensionless)

Output(s)

$S_{w}$: Water Saturation (fraction)

Formula(s)

$$ S_{w}=\left(\frac{F * R_{w}}{R_{t}}\right)^{\frac{1}{n}} $$

Reference(s)

Bassiouni, Z., 1994, Theory, Measurement, and Interpretation of Well Logs. SPE Textbook Series Vol. 4. Chapter 1, Page: 11.