PetrophysicsElectrical Properties
Diffuse-Layer Thickness from Salt Concentration Formula
Diffuse-Layer Thickness from Salt Concentration calculates diffuse-layer thickness for electrical properties workflows in petrophysics.
How engineers use this formula
Use this formula when the listed inputs (n_salt) 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, x_d equals 9.486833 angstrom.
n_saltmol/L
0.1
Inputs
n_salt
mol/LSalt Concentration
Outputs
x_d
angstrom
Diffuse-Layer Thickness
n_salt
mol/L
Salt Concentration
Source and review
reviewedBassiouni, Z. 1994. Theory, Measurement, and Interpretation of Well Logs. SPE Textbook Series Vol. 4, Chapter 1, Page 14.
Source