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International Journal Geology and Mining
Oil generative potential of shale from Asu river group in the Afikpo basin, Southeast Nigeria
Uzoegbu MU, Amoke AI
Department of Geology, College of Physical and Applied Sciences, Michael Okpara University of Agriculture, Umudike, PMB 7267, Umuahia, Abia State, Nigeria.
Accepted 12 March, 2017.
Citation: Uzoegbu MU, Amoke AI (2017). Oil generative potential of shale from Asu river group in the Afikpo basin, Southeast Nigeria. International Journal Geology and Mining 3(1): 081-089.
Copyright: © 2017 Uzoegbu MU, Amoke. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
Shale from Asu River Group strata of the Afikpo Basin has been characterised by geochemical techniques. The aims of this study were to assess the quality of its organic matter, evaluate its thermal evolution and highlight its potential as a source rock. The determination of hydrocarbon potential of shale from the Asu River Group in Afikpo Basin, Southeastern Nigeria was carried out using some Rock-Eval pyrolysis parameters such as TOC, HI, OI, S2/S3 and S1 + S2. The shale samples were collected at Amenu and Amauro outcrop localities. The samples were examined and analyzed to determine their oil and gas potential. The HI values range from 3.95 to 47.98 mgHC/gTOC and average value of 23.17 mgHC/gTOC indicates a Type III kerogen. Tmax values ranging from 349 to 454 oC with an average of 405 oC shows that the shale samples are immature to marginally mature. The total organic carbon (TOC) (5.60 wt%) and S1 + S2 (3.05) of the shale constitutes that of excellent source rock with gas-prone kerogen indicated by Rock-Eval S2/S3 (1.71). The high oxygen index (OI) (20.84 mgCO2g-1TOC) suggest deposition in a shallow marine environment. Generated petroleum may not have reached the threshold for hydrocarbon expulsion but a review of petroleum system elements in the basin will stimulate high prospects in the Afikpo basin.
Keywords: Shale, Hydrogen index, Total organic carbon, Hydrocarbon potential, Asu River Group, Afikpo Basin.