Pickett crossplot

Input(s)

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

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

$\Phi$: Mud Filtrate Resistivity (fraction)

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

$\mathrm{m}$: Pore Geometry Coefficient2 (Range of 1.14 to 2.52) (dimensionless)

Output(s)

$\log$ 1: Rock Resistivity (ohm m)

Formula(s)

$$ \log R 1=-m * \log (\Phi)+\log \left(R_{w}\right)-n * \log \left(S_{w}\right) $$

Reference(s)

Bassiouni, Z., 1994, Theory, Measurement, and Interpretation of Well Logs. SPE Textbook Series Vol. 4. Chapter 13, Page: 276.