Sonic porosity (Raymer Hunt Gardner method)
Input(s)
\(\Delta \mathrm{t}\): Sonic Log Reading for Transit Time \((\mu \mathrm{mu} \mathrm{s} / \mathrm{ft})\)
\(\Delta t_{m a}\): Sonic Log Reading for Transit Time \((\mu-\mathrm{s} / \mathrm{ft})\)
C: Empirical Constant (0.624-0.7) (dimensionless)
Output(s)
\(\Phi_{\text {sonic }}\): Sonic Porosity (fraction)
Formula(s)
\[
\Phi_{\text {sonic }}=C * \frac{\Delta t-\Delta t_{m a}}{\Delta t}
\]
Reference(s)
Core Laboratories. 2005. Formation Evaluation and Petrophysics, Page: 87.