Subsurface information on source rock potential of the Eocene shale unit of the Abakaliki Fold Belt is limited and has not been widely discussed. The total organic carbon (TOC) content and results of rock-eval pyrolysis for nine shale samples, as well as the one-dimensional (1D) geochemical model, from an exploration well in the Abakaliki Fold Belt were used to evaluate the source rock potentials and timing of hydrocarbon generation of Lower Eocene source rocks. The TOC content values of all the samples exceeded the minimum threshold value of 0.5 wt.% required for potential source rocks. A pseudo-Van Krevelen plot for the shale samples indicated Type II–III organic matter capable of generating gaseous hydrocarbon at thermally mature subsurface levels. The 1D burial model suggests that the Eocene source rock is capable of generating oil and gas at the present time. The modelled transformation ratio trend indicates that a fair amount of hydrocarbon has been expelled from the source rocks. The results of this study indicate that the Eocene source units may have charged the overlying thin Eocene sand bodies of the Abakaliki Fold Belt.
If the inline PDF is not rendering correctly, you can download the PDF file here.
 Ekweozor, C.M. (1982): Petroleum Geochemistry: Application to petroleum exploration in Nigeria’s Lower Benue Trough. In: 20th Anniversary proceeding, Nigeria Mining and Geosciences Society, Oluyide, P. O., Mbonu, W. C., Onuogu, S. A., 19(1), pp. 122–129.
 Ehinola, O.A., Sonibare, O.O., Akanbi, O.A. (2005): Economic evaluation, recovery techniques, and environmental implications of the oil shale deposits in the Abakaliki Fold Belt, Southeastern, Nigeria. Oil Shale, 22(1), pp. 1–15.
 Oluwajana O.A., Ehinola O.A. (2018): Potential shale resource plays in southeastern Nigeria: Petroleum system modeling and microfabric perspectives. Journal of African Earth Sciences, 138, pp. 247–257.
 Unomah G.I., Ekweozor, C.M. (1990): First discovery of oil shale in the Benue Trough, Nigeria. FUEL, 69(4), pp. 502–508.
 Olajubaje, T.A., Akande S.O., Adeoye, J.A., Adekeye, O.A., Friedrich, C. (2018): Depositional Environments and Geochemical Assessments of the Bende Ameki Formation Potential as Petroleum Source Rocks in the Ogbunike Quarry, South-Eastern Nigeria. European Scientific Journal, 14, pp. 157–175.
 Nzekwe, I.E., Okoro, A.U. (2016): Organic and Trace Element Geochemistry of the Ameki Formation, South Eastern Nigeria: Implications and Hydrocarbon Generating Potential. Journal of Applied Geology and Geophysics, 4(4), pp. 12–20.
 Ehinola, O.A. (2002): Depositional Environment and Hydrocarbon Potential of the Oil Shale Deposit from the Abakaliki Fold Belt, Southeastern Nigeria. Ph. D. Thesis. University of Ibadan: Ibadan, 240 p.
 Petters, S.W., Ekweozor, C.M. (1982): Petroleum geology of Benue Trough and southeastern Chad basin, Nigeria. Am. Assoc. Petrol. Geol. Bull, 66, pp. 1141–1149.
 Murat, R.C. (1969): Geological Data Book of Southern Nigeria, Unpublished Report of Exploration Department of Shell-BP.C Nigeria, 26 p.
 Oluwajana, O.A., Ehinola, O.A., Okeugo, C.G., Adegoke O. (2017): Modelling hydrocarbon generation potentials of Eocene source rocks in the Agbada Formation, Northern Delta Depobelt, Niger Delta Basin, Nigeria. Journal of Petroleum Exploration and Production Technology, 7(2), pp. 379–388.
 Ehinola, O.A., Sonibare, O.O., Javie, D.M., Oluwole, E.A. (2008): Geochemical appraisal of organic matter in the mid-cretaceous sediments of the Calabar Flank, Southeastern Nigeria. Eur. J. Sci. Res., 4(23), pp. 567–577.
 Reyment, R.A. (1965): Aspects of the Geology of Nigeria. Am. Assoc. Petrol. Geol. Bull, 66, p. 1141.
 Short, K.C., Stauble, A.J. (1967): Outline of Geology of Niger Delta. The American Association of Petroleum Geologists Bulletin, 51, pp. 761–779.
 Underdown, R., Redfern, J. (2008): Petroleum generation and migration in the Ghadames Basin, North Africa: a two-dimensional basin-modeling study. The American Association of Petroleum Geologists Bulletin, 92(1), pp. 53–76.
 Tissot, G.P., Welte, D.H. (1984): Petroleum Formation and occurrence, 2nd edition, Springer: Berlin, 702 p.
 El Nady, M.M. Ramadan, F.S., Hammad, M.M., Lotfy, N.M. (2015): Evaluation of organic matters, hydrocarbon potential and thermal maturity of source rocks based on geochemical and statistical methods: Case study of source rocks in Ras Gharib oilfield, central Gulf of Suez, Egypt. Egyptian Journal of Petroleum, 24, pp. 203–211.
 Hunt, J. (1996): Petroleum Geochemistry and Geology, 2nd edition, W.H. Freeman and Company.
 Waples, D. (1985): Geochemistry in Petroleum Exploration. Inter. Human Resources and Develop. Co.: Boston, 232 p.
 Bustin, R.M. (1988): Sedimentology and characteristics of dispersed organic matter in Tertiary Niger Delta: Origin of source rocks in a deltaic environment: The American Association of Petroleum Geologists Bulletin, 72, pp. 277–298.
 Amer, A.M., Che, A.A. (2009): Characterization of the Black Shales of the Temburong Formation in West Sabah, East Malaysia. European Journal of Scientific Research, 30(1), pp. 79–98.
 Yahi, N., Schaefer, R.G., Littke, R. (2001): Petroleum generation and accumulation in the Berkine basin, eastern Algeria. The American Association of Petroleum Geologists Bulletin, 85(8), pp. 1439–1467.
 Benkhelil, J., Guiraud, M., Ponsard, J. F., Saugy, F. (1989): The Bornu Benue Trough, the Niger Delta and its Offshore: Tectono-sedimentary Reconstruction during the Cretaceous and Tertiary from Geophysical Data and Geology. In: Geology of Nigeria, Kogbe, C.A. (ed.). Elizabethan Publ. Co.: Lagos, pp. 277–309.
 Olade, M.A. (1975): Evolution of Nigeria’s Benue Trough (Aulacogen): A tectonic model. Geological Magazine, 112(6), pp. 575–583.
 Nwachukwu, J.I. (1985): Petroleum prospects of the Benue Trough, Nigeria. The American Association of Petroleum Geologists Bulletin, 69(4), pp. 601–609.
 Kogbe, C.A., (1989): Paleogeographic History of Nigeria from Albian Times. Geology of Nigeria, pp. 257–274.
 Baggelaar, H., Van Morkhoven, F.P.C.N., Gutjahr, C.M. (1954): Owerri Geological Report No 116 Compilation Paleontological and Biostratigraphical Results, Southern Nigeria. Unpublished Shell Internal Report, 35 p.
 Odigi, M.I., Amajor, L.C. (2009): Brittle deformation of the Afikpo Basin, Southeastern Nigeria: evidence for a terminal Cretaceous extensional regime in the Lower Benue Trough. China J. Geochem., 28(4), pp. 369–376.
 Odigi, M.I. (2011): Diagenesis and reservoir quality of Cretaceous sandstones of Nkporo Formation (Campanian) southeastern Benue trough, Nigeria. J. Geol. Min. Res, 3(10), pp. 265–280.
 Sweeney, J.J., Burnham, A.K. (1990): Evaluation of a simple model of vitrinite reflectance based on chemical kinetics. The American Association of Petroleum Geologists Bulletin, 74, pp. 1559–1570.
 ÇiftÇi B., Temel, R., İztan, Y. (2010): Hydrocarbon occurrences in the western Anatolian (Aegean) grabens, Turkey: Is there a working petroleum system? The American Association of Petroleum Geologists Bulletin, 94(12), pp. 1827–1857.
 Agagu, O.K., Fayose, E.A., Peters S.W. (1985): Stratigraphy and sedimentology of the Senonian Anambra Basin of eastern Nigeria Nig. Journ. Min. Geol., 22, pp. 25–36.
 Ekine, A.S., Onuoha, K.M. (2010): Seismic Geohistory and Differential Interformational Velocity Analysis in the Anambra Basin, Nigeria. Earth Sci. Res. J., 14(1), pp. 88–99.