Biomarker characteristics of the Turonian–Eocene succession, Belayim oilfields, central Gulf of Suez, Egypt

W.Sh. El Diasty, A.A. Abo Ghonaim, A.R. Mostafa, S.Y. Beialy, K. J. Edwards

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Abstract

This study assesses the hydrocarbon source rocks of the Belayim oilfields, central Gulf of Suez, Egypt. Detailed geochemical methods, including liquid chromatography, gas chromatography and gas chromatography–mass spectrometry, are used to characterize organic-rich facies of the Turonian–Eocene deposits. Crude oil samples are analyzed using C7 and stable carbon isotopes, in addition to analysis of the extracts, in order to throw light on the organic matter source, composition, and thermal maturity. The source rocks are mainly derived from algae and bacteria deposited under normal saline and reducing palaeoenvironmental conditions, with a minimal contribution from terrestrial organic and mainly clay-poor source rocks. This is evidenced by the n-alkane distribution, the pristane/phytane, homohopane, gammacerane index, the high concentration of cholestane, the presence of the C30n-propylcholestanes and low diasteranes ratios. The source rock extracts range from immature to marginally mature, based on biomarker maturity-related parameters. A similar scenario is envisaged from the crude oil samples which showed a partial positive correlation with the source rocks of the Eocene Thebes Formation, and the Upper Cretaceous Brown Limestone. Our data suggest that Turonian–Santonian Matulla Formation samples may signify the presence of some oil in the study area.
Original languageEnglish
Pages (from-to)91-100
Number of pages10
JournalJournal of the Association of Arab Universities for Basic and Applied Research
Volume19
Early online date26 Jun 2014
DOIs
Publication statusPublished - Feb 2016

Fingerprint

source rock
biomarker
crude oil
geochemical method
thermal maturity
alkane
carbon isotope
spectrometry
liquid chromatography
gas chromatography
Eocene
stable isotope
alga
gulf
limestone
hydrocarbon
Cretaceous
organic matter
clay
bacterium

Keywords

  • biomarkers
  • Belayim oilfields
  • Turonian-Ecocene
  • Gulf of Suez
  • Egypt

Cite this

Biomarker characteristics of the Turonian–Eocene succession, Belayim oilfields, central Gulf of Suez, Egypt. / El Diasty, W.Sh.; Abo Ghonaim, A.A. ; Mostafa, A.R.; Beialy, S.Y.; Edwards, K. J.

In: Journal of the Association of Arab Universities for Basic and Applied Research, Vol. 19, 02.2016, p. 91-100.

Research output: Contribution to journalArticle

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abstract = "This study assesses the hydrocarbon source rocks of the Belayim oilfields, central Gulf of Suez, Egypt. Detailed geochemical methods, including liquid chromatography, gas chromatography and gas chromatography–mass spectrometry, are used to characterize organic-rich facies of the Turonian–Eocene deposits. Crude oil samples are analyzed using C7 and stable carbon isotopes, in addition to analysis of the extracts, in order to throw light on the organic matter source, composition, and thermal maturity. The source rocks are mainly derived from algae and bacteria deposited under normal saline and reducing palaeoenvironmental conditions, with a minimal contribution from terrestrial organic and mainly clay-poor source rocks. This is evidenced by the n-alkane distribution, the pristane/phytane, homohopane, gammacerane index, the high concentration of cholestane, the presence of the C30n-propylcholestanes and low diasteranes ratios. The source rock extracts range from immature to marginally mature, based on biomarker maturity-related parameters. A similar scenario is envisaged from the crude oil samples which showed a partial positive correlation with the source rocks of the Eocene Thebes Formation, and the Upper Cretaceous Brown Limestone. Our data suggest that Turonian–Santonian Matulla Formation samples may signify the presence of some oil in the study area.",
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note = "We are grateful to the Belayim Petroleum Company (PETROBEL) for providing the samples for this study. Gratitude is also expressed to STRATOCHEM Services, New Maadi, Cairo, Egypt for supporting GC–MS analyses. Two anonymous reviewers and the Editor are thanked for their critical comments and suggested revisions that improved the text.",
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