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Asian Journal of Earth Sciences
  Year: 2011 | Volume: 4 | Issue: 3 | Page No.: 157-170
DOI: 10.3923/ajes.2011.157.170
 
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Source Rock Potential and Thermal Maturity of the Tertiary Lignite Series in the Ogwashi-Asaba Formation, Southern Nigeria

J.E. Ogala

Abstract:
The source rock potential and thermal maturation of the Tertiary lignite series within the Ogwashi-Asaba Formation, Southern Nigeria was assessed by Rock-Eval pyrolysis, maceral analysis and vitrinite reflectance measurements. The Total Organic Carbon (TOC), Genetic Potential (GP) and Hydrogen Index (HI) values for the coals ranged from 44.93 to 63.54 wt.%, 104.65 to 248.13 mg HC/g rock and 157 to 402 mg HC/g TOC, respectively. These values indicate that the coals have gas and oil generating potential. Maceral analyses showed that the coals are dominated by huminite with subordinate amount of liptinite and inertinite. HI versus Oxygen Index (OI) diagram and atomic H/C ratios of 1.04-1.55 and O/C ratios of 0.27-0.33 classify the organic matter in the coals as Type II kerogen whereas plots of HI versus Tmax indicated a mixed Type II-III and Type III kerogen, respectively. Vitrinite reflectance values of 0.24 to 0.36% Ro and Tmax values between 404 and 425°C suggested that the coals are thermally immature with respect to petroleum generation.
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How to cite this article:

J.E. Ogala , 2011. Source Rock Potential and Thermal Maturity of the Tertiary Lignite Series in the Ogwashi-Asaba Formation, Southern Nigeria. Asian Journal of Earth Sciences, 4: 157-170.

DOI: 10.3923/ajes.2011.157.170

URL: https://scialert.net/abstract/?doi=ajes.2011.157.170

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