Deep-seated lacustrine source rock may occur in Gongola basin, Nigeria

Standard organic geochemical analyses were carried out to assess the source-rock potential of selected samples from the Nasara-1 exploratory well drilled through an entirely Cretaceous succession in the Gongola basin of Nigeria’s Upper Benue Trough.Total organic carbon (TOC) content and hydrogen indices (HIs) were found generally to be very low. However, in the depth interval 4,710-70 ft, TOC values of 52.1-55.2 wt % were recorded (may be coal). HIs were between 564 and 589 mg HC/g TOC, and Tmax was 423-428° C. Biomarker data indicate a dominance of low molecular weight n-alkanes (C15-C25), pristane/phytane ratios of 0.8-1.3, and very high contents of C28 regular steranes.These ...

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