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