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.