True porosity from sonic log (corrected for compaction)

Input(s)

$\Phi_{a}$: Calculated Sonic Porosity Without Compaction Correction (fraction)

$C_{p}$: Compaction Factor (dimensionless)

Output(s)

$\Phi_{t}$: True Porosity (fraction)

Formula(s)

$$ \Phi_{t}=\frac{\Phi_{a}}{C_{p}} $$

Notes: Works best for unconsolidated sands where Wyllie Time Average Equation Overestimates.

Reference(s)

Core Laboratories. 2005. Formation Evaluation and Petrophysics, Page: 90.