PetrophysicsRock Properties
Spacing Between Transmitter and Receiver Formula
Spacing Between Transmitter and Receiver calculates critical spacing between transmitter and receiver for rock properties workflows in petrophysics.
How engineers use this formula
Use this formula when the listed inputs (s_off, C_mf) 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, L_s_c equals 4 ft.
s_offft
1
C_mfdimensionless
0.6
Inputs
s_off
ftOffset Spacing
C_mf
dimensionlessMud-Filtrate Correction Coefficient
Outputs
L_s_c
ft
Critical Spacing Between Transmitter and Receiver
s_off
ft
Offset Spacing
C_mf
dimensionless
Mud-Filtrate Correction Coefficient
Source and review
reviewedBassiouni, Z. 1994. Theory, Measurement, and Interpretation of Well Logs. SPE Textbook Series Vol. 4, Chapter 10, Page 192.
Source