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Fertl-Hammack Shaly Sand Water Saturation Calculator

Sw=(FRwRt)0.5−VshRw0.4ϕeRshS_w=\left(\frac{FR_w}{R_t}\right)^{0.5}-\frac{V_{sh}R_w}{0.4\phi_eR_{sh}}

Enter the required inputs, confirm the units, and run the calculator to solve S_w. Review the formula source and assumptions before using the result in engineering work.

Tabular solver

Inputs

Defaults provide a quick field-unit example for the equation.

6 variables

Calculation runs locally with the shared TypeScript engine.

Formula reference

Fertl-Hammack Shaly Sand Water Saturation calculates water saturation for resistivity logs workflows in petrophysics.

View formula, units, and source

Assumptions

  • Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
  • The declared units match the field-unit constants used in the formula.
  • The cited formula applies to the selected petroleum engineering workflow.

Common mistakes

  • Mixing unit systems without converting the inputs.
  • Using default example values as field recommendations.
  • Applying the formula outside the source assumptions.