# Water saturation - Resistivity logs

## Input(s)

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

$R I$: Resistivity Index (dimensionless)

## Output(s)

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

## Formula(s)

$S_{w}=\left(\frac{1}{R I}\right)^{\frac{1}{n}}$## Reference(s)

Core Laboratories. 2005. Formation Evaluation and Petrophysics, Page: 42.