Organic Geophysics of Petroleum Source Rock and Depositional Environments in the Niger Delta, Nigeria

Abstract

Seven wells regionally spread in the Niger Delta was used to analyze source rock potential in the Niger Delta. The total organic carbon (TOC) was calculated from well logs (sonic log). Highest TOC, up to 9.1 wt. %, occur in Agbada Formation in Abraka-001. The TOC range from 0.6 wt. % in Angalalei-001 to 36 wt. % in Olomoro-001.  These indicate fair to good source rocks. Eocene TOC (1.8 - 7.8 wt. %) and Oligocene (2-39 wt. %) rocks show good source rock quality. Miocene rock contains (0.6 - 1.5 wt. %) and this indicates poor to good source rocks. Based on the resistivity (maturity indicator) and temperature (geothermal) map, the area is divided into low and high resistivity and temperatures values. Akata Formation has very high resistivity (158Ωm) around (Ameshi-001). This indicates that Ameshi-001 contains oil in the Eocene.