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.