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HYDROCARBON POTENTIAL OF THE UPPER CRETACEOUS COAL AND SHALE UNITS IN THE ANAMBRA BASIN, SOUTHEASTERN NIGERIA

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Author(s): Jude E. Ogala

Journal: Petroleum and Coal
ISSN 1337-7027

Volume: 53;
Issue: 1;
Start page: 35;
Date: 2011;
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Keywords: Production index | Coal | Hydrocarbon | Rock-Eval pyrolysis | Vitrinite reflectance.

ABSTRACT
The hydrocarbon potential of the Upper Cretaceous units (Maastrichtian Mamu Formation) of theAnambra Basin, Southeastern Nigeria was assessed by Rock-Eval pyrolysis. The total organiccarbon (TOC) values range from 0.07 to 61.42 wt. % (averaging 8.54 wt. %). The geneticpotential (GP) and hydrogen index (HI) values range from 0.05 to 332 mg HC/g rock and 40 to771 mg HC /g respectively. These values indicate that the sediments have gas and oil generatingpotential. The organic matter is predominantly gas prone (mostly type III and mixed type III/II).The level of thermal maturity deduced from the production index (0.02 to 0.63), calculatedvitrinite reflectance of 0.47 to 0.78 %Ro and Tmax values between 338 and 441oC suggest that thecoal and shale samples are thermally immature to marginally mature with respect to petroleumgeneration.
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