Reservoir EngineeringRock Properties
Core Bulk Volume from Saturated and Immersed Weights Formula
Core Bulk Volume from Saturated and Immersed Weights calculates bulk rock volume for rock properties workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (W_s, W_i, rho_s) are known and the assumptions behind the cited rock properties 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_b equals 100 cm^3.
W_sg
120
W_ig
20
rho_sg/cm^3
1
Inputs
W_s
gSaturated Sample Weight in Air
W_i
gSaturated Sample Weight Immersed in Liquid
rho_s
g/cm^3Saturating Liquid Density
Outputs
V_b
cm^3
Bulk Rock Volume
W_s
g
Saturated Sample Weight in Air
W_i
g
Saturated Sample Weight Immersed in Liquid
rho_s
g/cm^3
Saturating Liquid Density
Source and review
reviewedAAPG Wiki. Porosity, bulk volume measurement.
Source