Abstract
Source rock potential and thermal maturity of the Eocene Nanka Formation of Ogbunike,south eastern Nigeria was assessed in this research work.The rock-eval pyrolysis result recorded a value range of 0.04 to 0.11,0.44 to 1.32 and 0.44 to 0.49 forS1, S2 and S2/S3respectively. Production Index (PI) and Hydrogen Index (HI) results have a value range of 0.08 and 11.83 to 55.00 respectively. TheSoluble Organic Matter (SOM) has an average value of 0.013 wt. %(127.55ppm), while Total organic carbon (Toc) recorded a value range of 2.40wt. % to 4.50 wt. %. Thermal Alteration index (TAI) of +1 to -2 and Vitrinite reflectance (Ro %) of 0.2% to 0.3% was recorded. Particulate organic matter of the samples was also analysed. The results suggests that the studied area is a type 1VKerogen,immatured stage of thermal maturity, fair source bed,but has a high organic carbon that can generate oil
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