Reservoir EngineeringReservoir Volumetrics
Reservoir Gas Volume from Gas In Place and Gas FVF Formula
Reservoir Gas Volume from Gas In Place and Gas FVF calculates initial reservoir gas volume for reservoir volumetrics workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (G, B_gi) are known and the assumptions behind the cited reservoir volumetrics relationship match the engineering case being checked.
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.
Limitations
- The calculation does not replace a full engineering model or operating procedure.
- Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.
Common mistakes
- Mixing unit systems without converting the inputs.
- Using default example values as field recommendations.
- Applying the formula outside the source assumptions.
Default example
Using the default inputs, V_gi equals 35,000,000 ft³.
GSCF
7000000000
B_gift³/SCF
0.005
Inputs
G
SCFOriginal Gas In Place
B_gi
ft³/SCFInitial Gas Formation Volume Factor
Outputs
V_gi
ft³
Initial Reservoir Gas Volume
G
SCF
Original Gas In Place
B_gi
ft³/SCF
Initial Gas Formation Volume Factor
Source and review
reviewedAAPG Wiki formation volume factor definition and Penn State PNG 301 gas volumetric method.
Source