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Gas Saturation in Water-Drive Gas Reservoirs Calculator

Sg=(G−Gp)Bg−We−WpBw1−Swi−SgrwSgrwGBgi1−Swi−We−WpBw1−Swi−SgrwS_g=\frac{(G-G_p)B_g-\frac{W_e-W_pB_w}{1-S_{wi}-S_{grw}}S_{grw}}{\frac{GB_{gi}}{1-S_{wi}}-\frac{W_e-W_pB_w}{1-S_{wi}-S_{grw}}}

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

9 variables

Calculation runs locally with the shared TypeScript engine.

Formula reference

Gas Saturation in Water-Drive Gas Reservoirs calculates gas saturation for material balance workflows in reservoir engineering.

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.