Reservoir EngineeringReservoir Volumetrics
Gross Rock Volume from Area and Gross Thickness Formula
Gross Rock Volume from Area and Gross Thickness calculates gross rock volume for reservoir volumetrics workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (A, h_g) 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_grv equals 418,176,000 ft³.
Aacres
160
h_gft
60
Inputs
A
acresMapped Reservoir Area
h_g
ftAverage Gross Reservoir Thickness
Outputs
V_grv
ft³
Gross Rock Volume
A
acres
Mapped Reservoir Area
h_g
ft
Average Gross Reservoir Thickness
Source and review
reviewedPenn State PNG 301. Estimation of STOOIP Using the Volumetric Method, Equation 4.03.
Source