PetrophysicsRock Properties
Linear Absorption Attenuation Coefficient Formula
Linear Absorption Attenuation Coefficient calculates linear absorption coefficient for rock properties workflows in petrophysics.
How engineers use this formula
Use this formula when the listed inputs (sigma, N) are known and the assumptions behind the cited rock 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, alpha_l equals 10 1/m.
sigmam^2/atom
5e-28
N1/m^3
2e28
Inputs
sigma
m^2/atomThin Cross Section
N
1/m^3Number of Atoms per Unit Volume
Outputs
alpha_l
1/m
Linear Absorption Coefficient
sigma
m^2/atom
Thin Cross Section
N
1/m^3
Number of Atoms per Unit Volume
Source and review
reviewedBassiouni, Z. 1994. Theory, Measurement, and Interpretation of Well Logs. SPE Textbook Series Vol. 4, Chapter 2, Page 33.
Source