Winsauer equation

Input(s)

a: Pore Geometry Coefficient (range of 0.35 to 4.78 ) (dimensionless)

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

ø: Porosity (fraction)

Output(s)

F: Formation resistivity factor (dimensionless)

Formula(s)

$$ F=a *(\phi)^{-m} $$

Reference(s)

Bassiouni, Z., 1994, Theory, Measurement, and Interpretation of Well Logs. SPE Textbook Series Vol. 4. Chapter 1, Page: 7.