PetrophysicsElectrical Properties
Total Rock Conductivity from Water Saturation Formula
Total Rock Conductivity from Water Saturation calculates total conductivity of rock for electrical properties workflows in petrophysics.
How engineers use this formula
Use this formula when the listed inputs (C_w, S_w, phi, E) are known and the assumptions behind the cited electrical 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, C_t equals 0.0616 1/ohm m.
C_w1/ohm m
1
S_wfraction
0.35
phifraction
0.22
Efraction
0.8
Inputs
C_w
1/ohm mConductivity of Water
S_w
fractionWater Saturation
phi
fractionPorosity
E
fractionElectrical Efficiency
Outputs
C_t
1/ohm m
Total Conductivity of Rock
C_w
1/ohm m
Conductivity of Water
S_w
fraction
Water Saturation
phi
fraction
Porosity
E
fraction
Electrical Efficiency
Source and review
reviewedWell Logging for Earth Scientists, Ellis, D. V., Singer, J. M. (2008)
Ellis, D. V. and Singer, J. M. 2008. Well Logging for Earth Scientists, Second Edition, Springer, Chapter 4, Page 77.
Source