PetrophysicsElectrical Properties
Generalized Archie Formation Factor with Lithology Coefficient Formula
Generalized Archie Formation Factor with Lithology Coefficient calculates formation factor for electrical properties workflows in petrophysics.
How engineers use this formula
Use this formula when the listed inputs (a, phi, m) 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, F equals 25 dimensionless.
adimensionless
1
phifraction
0.2
mdimensionless
2
Inputs
a
dimensionlessArchie Lithology Coefficient
phi
fractionPorosity
m
dimensionlessCementation Exponent
Outputs
F
dimensionless
Formation Factor
a
dimensionless
Archie Lithology Coefficient
phi
fraction
Porosity
m
dimensionless
Cementation Exponent
Source and review
reviewedSLB Energy Glossary. Formation factor; AAPG Wiki. Archie equation.
Source