Free gas initially in place (FGIIP)
Free gas initially in place by the volumetric method, in million standard cubic feet.
G = C × A × h × φ × (1 − Swc) / Bgi / 10⁶Inputs
You can change a field's unit: the value is converted to the formula's units automatically.
Unit converter for this formulaArea · Length · Gas formation volume factor · Gas volume · Fraction and percent
- m²1
- km²1·10⁻⁶
- ha0.0001
- 10³ m²0.001
- mm²1,000,000
- cm²10,000
- in²1,550
- ft²10.7639
- acre0.000247105
More in Reserves and recovery
Stock tank volume of oil initially in place by the volumetric method, in million barrels.
Gas dissolved in oil initially in place by the volumetric method, in million standard cubic feet.
Initial oil in place by the volumetric formula of Russian and Kazakh reserves reports (GKZ): oil-bearing area, net oil pay, porosity and oil saturation, shrinkage factor and oil density. The result is in thousand tonnes and thousand cubic metres of stock-tank oil, with the dissolved gas in place.
The recovery factor as the product of the displacement, sweep and flooding efficiencies; the displacement efficiency comes from the initial and residual oil saturations of core floods. Recoverable reserves are that share of the oil in place.
Results are engineering estimates from standard formulas; for design decisions check them against the codes, project documents and specialists' calculations. The formulas carried over from the original set are unchanged, and their errors are described in the notes.