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Scirj Volume I, Issue II, September 2013 Edition
GEOCHEMICAL CHARACTERIZATION AND PALEOENVIROMENT OF TURONIAN DUKUL FORMATION, NE NIGERIA
Uzoegbu, M. Uche, Obaje, N. George, Ekeleme, I. Aquila
Abstract The Upper Benue rift comprising the Gongola and Yola Basins in Nigeria consist of the Aptian-Albian Bima Formation. The Yolde Formation (Cenomanian-Turonian), Gongila/Pindiga/Dukul Formation (Turonian-Coniacian) and Gombe Formation (Campanian-Maastrichtian). Shale from Turonian strata of the Dukul Formation has been characterized by petrological and 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 total organic carbon (TOC) (0.58wt%) of the shale constitutes that of a poor to fairly source rock with gas-prone kerogen indicated by Rock-Eval S2/S3 (0.60). The low oxygen index (OI) (0.98 mgCO2g-1TOC) and the presence of biomicritic limestone suggest deposition under low energy environments. The plots of HI against Tmax and predominance of vitrinite rich macerals classified the organic matter as Type III kerogen. The poor concentration of OM is thought to account for its current hydrogen index (35.0 mgHCg-1TOC). The predominance of Type III kerogen in the Dukul Formation suggests their potential to generate gas in the deeply buried sections. The Tmax values from the pyrolysis of the shales of the Dukul Formation ranges from 431 to 442oC whereas Ro of the shales ranges from 0.57 to 0.75%. These values correspond to maturity levels within the oil formation.
Reference this Paper: GEOCHEMICAL CHARACTERIZATION AND PALEOENVIROMENT OF TURONIAN DUKUL FORMATION, NE NIGERIA by Uzoegbu, M. Uche, Obaje, N. George, Ekeleme, I. Aquila published at: "Scientific Research Journal (Scirj), Volume I, Issue II, September 2013 Edition, page 5-18".
Search Terms: Benue Trough, Source rock, Kerogen type, pyrolysis, Maturity, Turonian
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