Reservoir EngineeringReservoir Volumetrics
Reservoir Oil Volume from Stock Tank Oil and Oil FVF Formula
Reservoir Oil Volume from Stock Tank Oil and Oil FVF calculates initial reservoir oil volume for reservoir volumetrics workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (N, B_oi) 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_oi equals 6,000,000 bbl.
NSTB
5000000
B_oibbl/STB
1.2
Inputs
N
STBStock Tank Oil Volume
B_oi
bbl/STBInitial Oil Formation Volume Factor
Outputs
V_oi
bbl
Initial Reservoir Oil Volume
N
STB
Stock Tank Oil Volume
B_oi
bbl/STB
Initial Oil Formation Volume Factor
Source and review
reviewedAAPG Wiki. Petroleum reservoir fluid properties, formation volume factor definition.
Source