Saturated biomarkers in the estimation of organic geochemical homogeneity of crude oils from four oil fields in Libya

Authors

  • Ramadan Musbah M. Saheed University of Belgrade, Faculty of Chemistry, Studentski trg 12-16, 11000 Belgrade, Serbia
  • Tatjana Šolević Knudsen Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia
  • Musbah Abduljalil M. Faraj University of Belgrade, Faculty of Chemistry, Studentski trg 12-16, 11000 Belgrade, Serbia
  • Zlatko Nikolovski Institute MOL, Nikola Tesla St. 15, 22300 Stara Pazova, Serbia
  • Hans Peter Nytoft Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, 1350 København K, Denmark
  • Branimir Jovančićević University of Belgrade, Faculty of Chemistry, Studentski trg 12-16, 11000 Belgrade, Serbia

DOI:

https://doi.org/10.2298/JSC200501055S

Keywords:

oil-oil correlation, Murzuq Basin, Sirte Basin

Abstract

Seven crude oils from four oil fields in the Sirte and Murzuq Basins in Libya were investigated in order to estimate their organic geochemical homogeneity. Saturated biomarkers (n-alkanes and isoprenoids) were analyzed using gas chromatography–mass spectrometry (GC–MS). The parameters cal­cul­ated from the distributions of n-alkanes and isoprenoid aliphatic alkanes, pristane and phytane were used to interpret the organic geochemical charac­ter­istics of the oils. Based on the high relative concentration of lower n-alkane homologues in the C11–C16 range and high API values, the oils were classified as light oils. These results also implied that the oils were not biodegraded. The parameters calculated from the distributions of saturated biomarkers indicated that all investigated oils were generated from source rocks containing organic matter of a similar marine origin but with a contribution of terrestrial organic matter. The results also demonstrated that these source rocks were deposited in an oxic environment. The same source rock or the same type of source rocks for all seven samples were postulated. It was concluded that, if the crude oils from these distant basins originated from the same source rocks, they must have had different lengths of their migration pathways.

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Published

2020-11-27

How to Cite

[1]
R. M. M. Saheed, T. Šolević Knudsen, M. A. M. Faraj, Z. Nikolovski, H. P. Nytoft, and B. Jovančićević, “Saturated biomarkers in the estimation of organic geochemical homogeneity of crude oils from four oil fields in Libya”, J. Serb. Chem. Soc., vol. 85, no. 11, pp. 1489-1499, Nov. 2020.

Issue

Section

Geochemistry

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