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Uzoegbu M Uche
Ikwuagwu C.S
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Ikwuagwu C.S
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International Journal Geology and Mining

Hydrocarbon Generative Potential of Campanian Source Rock from Ihube, Anambra Basin, Nigeria

Uzoegbu, M. Uche and Ikwuagwu S. Chibuisi

Department of Geology, College of Physical and Applied Sciences, Michael Okpara University of Agriculture, Umudike, PMB 7267, Umuahia, Abia State.

Accepted 08 June, 2016.

Citation: Uzoegbu MU, Ikwuagwu CS (2016). Hydrocarbon generative potential of Campanian source rock from Ihube, Anambra basin, Nigeria. International Journal Geology and Mining 2(1): 053-063.

Copyright: © 2016 Uzoegbu and Ikwuagwu. 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.

Abstract

Shale from basal Campanian strata of the Anambra Basin has been characterized 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 HI versus Tmax and HI versus OI diagrams were used in classifying the organic matter in the shale indicating the presence of Type III kerogen. Tmax values between 424 and 441ºC indicate that the shales are thermally immature to marginally mature with respect to petroleum generation. Hydrogen Index (HI) values range from 13.89 to 38.89mgHC/gTOC while S1 + S2 yields values ranging from 0.19 to 0.78mgHC/g rock, suggesting that the shale have gas generating potential. The TOC of shale samples of the studied Ihube locality ranges from 1.31 to 1.98%, an indication of a good source rock of terrestrially derived organic matter. The high oxygen index (OI) (26.93 mgCO2g-1TOC) and TS (1.32) suggest deposition in a shallow marine environment. Based on the kerogen type, shales from Ihube, Nkporo Formation will equally generate oil and gas if its organic matter attained sufficient thermal temperature.

Keywords:  Shale, organic matter, kerogen type, maturity, source rock, oil generation, Ihube, Anambra basin, Nigeria