PetrophysicsResistivity Logs
Movable Hydrocarbon Saturation from Flushed Zone Formula
Movable Hydrocarbon Saturation from Flushed Zone calculates movable hydrocarbon saturation for resistivity logs workflows in petrophysics.
How engineers use this formula
Use this formula when the listed inputs (S_xo, 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, S_hm equals 0.45 fraction.
S_xofraction
0.8
S_wfraction
0.35
Inputs
S_xo
fractionFlushed-Zone Water Saturation
S_w
fractionUninvaded-Zone Water Saturation
Outputs
S_hm
fraction
Movable Hydrocarbon Saturation
S_xo
fraction
Flushed-Zone Water Saturation
S_w
fraction
Uninvaded-Zone Water Saturation
Source and review
reviewedPfEFFER Theory: Movable Hydrocarbons, Kansas Geological Survey
Kansas Geological Survey PfEFFER. Movable hydrocarbon discussion and flushed-zone saturation workflow.
Source