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Larionov Older-Rock Shale Volume from Gamma Ray Index Calculator

Vsh=0.33(22IGR−1)V_{sh}=0.33\left(2^{2I_{GR}}-1\right)

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

1 variables

Calculation runs locally with the shared TypeScript engine.

Formula reference

Larionov Older-Rock Shale Volume from Gamma Ray Index calculates shale volume for older rocks 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.