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Arabian Journal of Geosciences

, 12:584 | Cite as

Distribution of methylhopanes in some Niger Delta oils

  • Mudiaga Chukunedum OnojakeEmail author
  • Selegha Abrakasa
Original Paper
  • 16 Downloads

Abstract

A suite of oil samples from Niger Delta oil fields were examined for compositional distribution of methylhopane. The samples were obtained from wellhead of oil wells and stored in sample bottles. The oil samples were fractionated and the saturate fraction was subjected to gas chromatography/mass spectrometry (GC–MS) analysis. The methylhopanes in the oils were identified, their abundance delineated, and are of potential use for oil characterization. The mass chromatograms of m/z 205 were extracted and the peaks identified using GC–MS library, literature, and mass spectra form the library. 2α–Methylhopanes and 3β–methylhopanes were identified in Nigerian Niger Delta oils. North Sea and Venezuelan Boscan oil were also examined. Generally, the Nigerian oils showed higher abundance of 2α–methylhopanes and lower abundance 3β–methylhopanes compared to the Boscan and North Sea oils. The plot of C30 hopane/C30 2α–methylhopane and C30 hopane/C30 3β–methylhopane for all the oils showed the discrimination of the oils into Niger Delta, North Sea, and Venezuelan Boscan oil. The ratio of C30 hopanes/methylhopanes can be applied as a correlation tool.

Keywords

Cyanobacteria Depositional environment Methylhopanes; methanotrophic bacteria 3β–Methylhopane 2α–Methylhopane 

Notes

Acknowledgments

The authors are sincerely grateful to the Nigerian Department of Petroleum Resource (DPR) and Platform Petroleum Nigeria Limited for granting us access to the crude oil samples used for this research work. We are grateful to research students namely Mr. Nnodi Okey, Mr. Idongesit Edem, and Mr. Charles Ikenna for assistance and collaboration.

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  • Mudiaga Chukunedum Onojake
    • 1
    • 2
    Email author
  • Selegha Abrakasa
    • 3
    • 4
  1. 1.Department of Pure and Industrial ChemistryUniversity of Port HarcourtPort HarcourtNigeria
  2. 2.Centre for Marine Pollution Monitoring and Seafood SafetyUniversity of Port HarcourtPort HarcourtNigeria
  3. 3.Department of GeologyUniversity of Port HarcourtPort HarcourtNigeria
  4. 4.Centre for Petroleum GeosciencesUniversity of Port HarcourtPort HarcourtNigeria

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