This paper reports comparative analysis of porosity values computed from sonic and density logs obtained from the same wells. Two well logs (sonic and density) acquired from OML X were digitized and analyzed for porosity. Results obtained showed that velocity and bulk density increases with depth due to compaction of rocks and the porosity values obtained from the two oil wells decreases with depth. Porosity values obtained at various depth from both sonic and density logs were subjected to statistical analysis using standard deviation and coefficient of variation, which shows that, for well log A, the coefficient of variation for sonic log derived porosity and density log derived porosity were 30% and 50% respectively. Similarly, for well B, the coefficient of variation for sonic log derived porosity and density log derived porosity became 29% and 37% respectively. From the principle of statistical analysis the coefficient of variation with lower value is preferred hence the result shows that sonic log would be more reliable than density log in the computation and determination of formation rock porosity.
