Organic and inorganic geochemical analyses and organic petrography of selected samples from various stratigraphic units penetrated by five exploratory wells (Kemar-1, Kinarsar-1, Kanadi-1, Ziye and Tuma-1) in Chad (Borno) Basin indicate that they are generally lean organically, and they are dominated by Type III and Type IV kerogen (Figure 1). Though, fair to good potential for gas generation exist in some parts of the basins, especially where the samples show high Total Organic Carbon (TOC), extractable organic matter (EOM) and hydrocarbon yield. The organic matter was deposited in marine environment, with substantial terrestrial input in anoxic-oxic depositional condition. This probably accounted for the poor preservation of the organic matter and the variable environment of deposition. Various maturity data (Vitrinite reflectance, Rock-Eval Tmax, Production Index, Bitumen/TOC ratio and biomarker distributions) suggested that the sediments, especially the lower part of the Fika Formation and the Gongila Formation, which composed majorly of shales and carbonates, have reached the early to peak stages of hydrocarbon generation. This study has further validated the previous studies on this basin, which reported that a potential for gas generation exists within the Chad (Borno) Basin.


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