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Wyllie Time-Average Sonic Porosity - Compacted Formations Calculator

Φs=Δt−ΔtmaΔtf−Δtma\Phi_s=\frac{\Delta t-\Delta t_{ma}}{\Delta t_f-\Delta t_{ma}}

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

Wyllie Time-Average Sonic Porosity - Compacted Formations calculates sonic porosity 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.