PetrophysicsRock Properties
Acoustic Transit Time Formula
Acoustic Transit Time calculates acoustic transit time for rock properties workflows in petrophysics.
How engineers use this formula
Use this formula when the listed inputs (v) 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, Delta_t equals 55.555556 us/ft.
vft/s
18000
Inputs
v
ft/sAcoustic Velocity
Outputs
Delta_t
us/ft
Acoustic Transit Time
v
ft/s
Acoustic Velocity
Source and review
reviewedBassiouni, Z. 1994. Theory, Measurement, and Interpretation of Well Logs, SPE Textbook Series Vol. 4, Chapter 3, Page 45.
Source