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Shale Index from Gamma Ray Spectrometry - Thorium Calculator

Ish,Th=CTh,log−CTh,minCTh,sh−CTh,minI_{sh,Th}=\frac{C_{Th,log}-C_{Th,min}}{C_{Th,sh}-C_{Th,min}}

Enter the required inputs, confirm the units, and run the calculator to solve I_sh_Th. 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.

3 variables

Calculation runs locally with the shared TypeScript engine.

Formula reference

Shale Index from Gamma Ray Spectrometry - Thorium calculates thorium shale index for rock properties 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.