Sonic Porosity Raymer-Hunt-Gardner Method Calculator
Enter the required inputs, confirm the units, and run the calculator to solve Phi_sonic. Review the formula source and assumptions before using the result in engineering work.
Calculation context and source notes
Sonic Porosity Raymer-Hunt-Gardner Method calculates sonic porosity for rock properties workflows in petrophysics. The page keeps the declared variables, units, source relationship, and output definition visible for technical review.
Use this formula when the listed inputs (Delta_t, Delta_t_ma, C_RHG) are known and the assumptions behind the cited rock properties relationship match the engineering case being checked.
Solves for
Phi_sonic (fraction)
Best next page
Formula, variables, and sourceFormula, variables, and default calculation
Reproducible default result
With the default values shown below, the calculation returns Phi_sonic = 0.209375 fraction. Defaults demonstrate the implementation; they are not recommended field values.
80
55
0.67
Input definitions
Delta_t
us/ftSonic Log Transit Time Reading
Delta_t_ma
us/ftMatrix Transit Time
C_RHG
dimensionlessRaymer-Hunt-Gardner Empirical Constant
Output definitions
Phi_sonic
Sonic Porosity
Delta_t
Sonic Log Transit Time Reading
Delta_t_ma
Matrix Transit Time
C_RHG
Raymer-Hunt-Gardner Empirical Constant
Engineering use, assumptions, and limits
Use this formula when the listed inputs (Delta_t, Delta_t_ma, C_RHG) 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.
Frequently asked questions
What inputs does the Sonic Porosity Raymer-Hunt-Gardner Method calculator need?
The calculation uses Sonic Log Transit Time Reading (Delta_t), Matrix Transit Time (Delta_t_ma), Raymer-Hunt-Gardner Empirical Constant (C_RHG). Enter values on the units shown beside each field.
What result does this calculator return?
The primary result is sonic porosity in fraction. The formula section shows the declared relationship, variables, and a reproducible default calculation.
What should I check before using the result?
Confirm the unit basis, source applicability, and input quality. The calculation does not replace a full engineering model or operating procedure. Mixing unit systems without converting the inputs.
Source and record status
Source metadata identifies the relationship implemented by the calculator. Check the cited edition, unit basis, and scope against the engineering case before operational use.
Formation Evaluation and Petrophysics, Core Laboratories (2005)
Core Laboratories. 2005. Formation Evaluation and Petrophysics, Page 87.
Open source reference