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.