PetrophysicsResistivity Logs
Bulk Volume Water from Porosity and Water Saturation Formula
Bulk Volume Water from Porosity and Water Saturation calculates bulk volume water for resistivity logs workflows in petrophysics.
How engineers use this formula
Use this formula when the listed inputs (phi, S_w) are known and the assumptions behind the cited resistivity logs 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, BVW equals 0.07 fraction bulk volume.
phifraction
0.2
S_wfraction
0.35
Inputs
phi
fractionPorosity
S_w
fractionWater Saturation
Outputs
BVW
fraction bulk volume
Bulk Volume Water
phi
fraction
Porosity
S_w
fraction
Water Saturation
Source and review
reviewedWater saturation distribution in a reservoir, AAPG Wiki
AAPG Wiki. Water saturation distribution in a reservoir, bulk volume water definition.
Source