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Articles by O.O. Sonibare
Total Records ( 2 ) for O.O. Sonibare
  O.A. Ehinola , O.O. Sonibare , O.A. Falode and B.O. Awofala
  Campano-Maastrichtian Nkporo Shales from the Lower Benue Trough, Nigeria were analyzed to assess their petroleum potential by sedimentological analysis and Rock-Eval pyrolysis. The Nkporo Shale consists of dark grey and highly fissile shale with interbeds of sandy shale, siltstone and mudstone. The Total Organic Carbon (TOC) ranges from 0.54 to 3.01 wt.%. These values exceed the minimum value of 0.5 wt.% usually required for potential petroleum source rocks. Hydrogen indices are relatively low, fluctuating within a small range of 20 and 153 mg HC/g TOC revealing kerogen of type III and mixed III/II organic matter (OM), which is predominantly gas prone. Tmax and Production Index (PI) ranged from 426 to 439 ° C (av. 432 ° C) and 0.02 to 0.08 (av. 0.03), respectively. These values indicated that the shales are presently thermally immature. Analytical parameters determined from the peak shape analysis of S2 pyrolysis curves such as asymmetry (B/A), asymmetry-1 (D/C) and Full Width at Half Height (FWHH) are between 0.64 to 1.18, 0.44 to 0.77 and 60 to 80 ° C, respectively. The broad width of FWHH indicated broad range of activation energy and further confirmed the classification of organic matter contained in Nkporo Shale as Type III. The present study showed that the Nkporo Shale has prospects to generate gas rather than oil at appropriate thermal maturity.
  T.A. Adedosu and O.O. Sonibare
  Infrared spectroscopy was applied in characterizing crude oils from Niger Delta in terms of their source and thermal maturity. The samples were characterized based on the peak intensities of the aliphatic and the carboxyl/carbonyl groups relative to the aromatics. Using this method, the oils classified mainly as oil derived from type 1 kerogen contrary to type II/III already reported for Niger delta oil. The Vitrinite Reflectance (VR) values obtained from the VR equivalent grid ranged from 0.5 to 0.7%, indicating that the oils are of low maturity. The estimated VR determined from the IR spectra correlate favourably with available values in the literature. The results of this study showed that Infrared spectroscopy might not be a good tool for oil source characterization but can be useful in determining oil maturity.
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