Resistivity index-Archie's law

Input(s)

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

$R_{o}$: Resistivity of Rock Filled with Water (ohm m)

Output(s)

RI: Resistivity Index (unitless)

Formula(s)

$$ R I=\frac{R_{t}}{R_{o}} $$

Reference(s)

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