PetrophysicsRock Properties
Sonic Compaction Correction Factor from Shale Transit Time Formula
Sonic Compaction Correction Factor from Shale Transit Time calculates compaction correction factor for rock properties workflows in petrophysics.
How engineers use this formula
Use this formula when the listed inputs (Delta_t_sh, c) 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, C_p equals 1.2 dimensionless.
Delta_t_shus/ft
120
cdimensionless
1
Inputs
Delta_t_sh
us/ftAdjacent Shale Bed Transit Time
c
dimensionlessShale Compaction Coefficient
Outputs
C_p
dimensionless
Compaction Correction Factor
Delta_t_sh
us/ft
Adjacent Shale Bed Transit Time
c
dimensionless
Shale Compaction Coefficient
Source and review
reviewedCore Laboratories. 2005. Formation Evaluation and Petrophysics, Page 87.
Source