Trace Elements Geochemistry of Upper Cretaceous Sediments In Bornu Basin At Its Boundary With Gongola Basin, Ne Nigeria: Implication For Petroleum Source Rock Evaluation
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Keywords

Trace Elements
Petroleum
Upper Cretaceous
Chad Basin
Gongola Basin

How to Cite

Mohammed,Y.B., Hamza,H., & Danbatta, U.A. (2019). Trace Elements Geochemistry of Upper Cretaceous Sediments In Bornu Basin At Its Boundary With Gongola Basin, Ne Nigeria: Implication For Petroleum Source Rock Evaluation. Research Journal of Science, 19(1), 11 - 29. Retrieved from http://journals.unimaid.edu.ng/index.php/rjs/article/view/73

Abstract

Geological mapping coupled with sample collection was carried out within the study area. Geological map was produced distinguishing different lithological units on basis of their field relationship using various geological parameters. Trace elements geochemical methods were employed using AAS and MR-EAS to determine the maturation level of shale samples for trace elements concentrations that are believed to have been incorporated into the petroleum charge system. These are; Biophile elements: V and Ni, the concentration of V ranged from 0.264 to 1.288ppm with an average of 0.6735ppm, Ni concentration ranged from 0.298 to 0.722ppm with an average of 0.425ppm. Siderophile elements: Fe, Co, Mo, Cr, Mn. The concentration of Fe ranged from 1.289 to 264ppm with an average of 144.12ppm, Co ranged 0.352 to 0.783ppm with an average of 0.50ppm. Mo concentration ranged from 0.030 to 0.133ppm with an average of 0.04ppm, the concentration of Cr ranged from 0.233 to 0.753ppm with an average of 0.428ppm, while Mn ranged from 0.821 to 7.567ppm with an average of 3.692ppm. Chalcophile elements: Cu, Zn, Pb, Cd. The concentration of Cu ranged from 0.000 to 0.238ppm with an average of 0.0829ppm, Zn has concentration values that ranged from 0.000 to 0.425ppm with an average of 0.104ppm. The concentration of Pb ranged from 0.000 to 0.339ppm with an average of 0.0035ppm, Cd concentration ranged from 0.000 to 0.020ppm in the analyzed source rocks (SR) samples with an average of 0.004ppm. The overall results showed that the Fe and Mn (siderophile) elements have the highest concentration value which does not correlate with crude oils analyzed from different parts of the world. In general, source rocks have higher geochemical values than crude oils samples, but in this study the concentration of the elements are mediocre which may be as a result of shallow depth of burial and lack of sedimentary cover over the targeted source rocks. This could be the principal factor. Some of the trace elements have shown close relationship in terms of their concentration with some Niger Delta crude oils and New Zealand while others differs considerably. Time temperature index of maturity (TTI) is also a very important component in aiding maturation of source rocks. Most matured source rocks are mostly found in deeper part of the basins, though this study was carried out at the fringe of the basin where the occurrence of most facies is at shallow depths.

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