Source Rock Evaluation of Paleocene Akinbo shale, Eastern Dahomey Basin

  • Authors

    • Dairo Victoria Crawford University, Igbesa, Nigeria
    • Asue Onenu Crawford University, Igbesa
  • Shale, Organic Matter, Gas, Hydrocarbon, Kerogen.
  • Selected subsurface core samples of the shale of Akinbo Formation as penetrated by an exploratory well in Ibese, Eastern Dahomey basin were investigated to ascertain the quality and quantity of organic matter, the hydrocarbon potential and kerogen type.

    The samples were subjected to Total Organic Carbon (TOC) and Rock Eval analyses and various cross plots were generated from the data obtained.

    The TOC and Free oil content (S1) of all the shale samples range from 0.96wt% to 2.82wt% and 0.07mgHC/g to 0.17mgHC/g with mean values of 1.67wt% and 0.11mgHC/g respectively while the source rock potential (S2) ranges from 0.01mgHC/g to 0.17mgHC/g with an average value of 0.08mgHC/g. Also, the Hydrogen Index (HI) and the Oxygen Index (OI), ranges from 0.35mgHC/g TOC to 16.7mgHC/g TOC and 11.4mgCO/g TOC to 38.33mgCO/g TOC with an average value of 5.77mgHC/g TOC and 19.04mgCO/g TOC respectively. The Production Index (PI) and the Generative Potential (GP) range from 0.38 to 0.94 and 0.12mgHC/g to 0.34mgHC/g with mean values of 0.61 and 0.19mgHC/g respectively.

    The results obtained from the cross plots of HI versus OI, S2 versus TOC and TOC versus GP; It shows that the shale samples from the Akinbo Formation have good organic matter richness to generate hydrocarbon, dominantly gas prone and from a Type III kerogen.

  • References

    1. [1] Adegoke OS (1969) Eocene Stratigraphy of Southern Nigeria. Bur. Rech. Geol. Min. Mem., Vol. 69, pp. 23 – 43.

      [2] Adekeye OA (2005) Eocene phosphates in the Dahomey Basin. Journal of Mining and Geology, Vol, 17, pp. 99 – 106.

      [3] Adekeye OA, Akande OS, Bale RB &Erdtmann BD (2006) Carbon and Oxygen isotopic compositions and diagenesis of the Ewekoro formation in the eastern Dahomey Basin southwestern Nigeria. Journal of Mining and Geology, Vol. 41 (1), pp. 87-95.

      [4] Akande SO & Ojo OJ (1992) Organnic petrology and rock eval studies on the source rock facies of the Campanian-Maastritchian Patti formation, southwestern Bida basin, Nigeria. Nigeria Association of Petroleum Explorationist Bulletin. Vol.16, pp.22-38.

      [5] AkoBD, Adegoke OS & Peters SW (1980) Stratigraphy of Oshosun formation in Southwestern Nigeria. Journal of Mining and Geology, Vol. 41. (1), pp. 87 – 95.

      [6] Conford C (1986) Source rocks and hydrocarbons of the North Sea. In: Glennie. K.W., (Ed), Introduction to the Petroleum Geology of the North Sea. Oxford U.K., pp 197 – 236.

      [7] DymanTS,Palacos JG, Tysdal RG, Perry WJ&Pawlewicz MJ (1996)Source rock potential of middle cretaceous rocks in Southwestern Montana: AAPG bulletin, v.80, pp. 1177-1184.

      [8] Jones HA & Hockey RD (1964) The Geology of parts of southwestern Nigeria. Geological survey of Nigeria Bulletin, Vol. 31, pp 87.

      [9] Kogbe CA (1974) Paleoecologic significance of vertebrate fossils in the Dukarnaje and Dange Formations (Maastritchtian and Paleocene) of northwestern Nigeria. Journal of Mining and geology, Vol.8, pp 49-55.

      [10] Ogbe FGA (1970) Stratigraphy of exposed strata in the Ewekoro quarry western Nigeria. In: T.F.J. Dessauvagie and A.J. Whitemann (Eds.). African Geology, University of Ibadan press, pp. 305 – 324.

      [11] Omatsola ME & Adegoke OS (1981) Tectonic evolution and Cretaceous stratigraphy of the Dahomey basin. Journal of Mining and Geology, Vol. 18(1) pp. 130 – 137.

      [12] Peters KE (1986) “Guidelines for evaluating petroleum source rock using programmed analysisâ€, The American Association of Petroleum Geologists Bulletin, vol. 70, pp. 318-329.

      [13] Tissot BP & Welte DH (1984) Petroleum Formation and Occurrence. 2nded. SpingerVerlag, Berlin 699p.

      [14] Reyment RA (1965) Aspects of the Geology of Nigeria, University of Ibadan, Press, Ibadan, Nigeria. P. 145

      [15] Unomah GI & Ekweosor CM (1993) Petroleum source rock assessment of the CampanaianNkporo shale, lower Benue through, Nigeria. NAPE bulletin, Vol.8, No2, pp 172- 186.

      [16] Whiteman AJ (1982) Nigeria, its petroleum geology, resources and potential: Vols. 1 and 2, Graham and Trontman, Ltd., London, 394p.

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  • How to Cite

    Victoria, D., & Onenu, A. (2017). Source Rock Evaluation of Paleocene Akinbo shale, Eastern Dahomey Basin. International Journal of Advanced Geosciences, 6(1), 34-42.