Bivariate Regression Analysis on Sonic Logs in the Niger Delta, Nigeria

Transit time curves are very useful in source rock studies. It indicates the presence of kerogen in the rock. In many wells the porosity log is either not available or transit-time is missing in the borehole section. A generalized equation could be obtained between total organic carbon (TOC) and transit time from sonic logs in nearby wells to generate transit-time curve for the targeted well. Equation is derived to calculate transit time from TOC for three wells, Pologbene-001, Umutu-002 and Ameshi-001.  This was applied successfully on Well Abraka-001, 110km away. Results show that the calculated transit time is camparable to the values of transit time obtainable in other nearby wells.