Hingle nonlinear-resistivity/linear-porosity crossplot

Input(s)

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

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

$\Phi$: Mud Filtrate Resistivity (fraction)

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

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

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

Output(s)

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

Formula(s)

$$ \left(R_{t}\right)^{-\frac{1}{m}}=\Phi *\left(\frac{S_{\mathrm{w}}^{n}}{a * R_{w}}\right)^{\frac{1}{m}} $$

Reference(s)

Bassiouni, Z., 1994, Theory, Measurement, and Interpretation of Well Logs. SPE Textbook Series Vol. 4. Chapter 13, Page: 268.