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Organic geochemistry of crude oils from the Intisar oil field (East Sirte Basin, Libya)

Authorized Users Only
2016
Authors
Faraj, Musbah Abduljalil M.
Šolević Knudsen, Tatjana
Nytoft, Hans Peter
Jovančićević, Branimir
Article (Published version)
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Abstract
Four crude oil samples from the oil fields Intisar A, Intisar D and Intisar E (Sirte Basin, Libya) were investigated in order to define depositional environment, lithology, thermal maturity and geologic age of the corresponding source rocks. Saturated biomarkers (n-alkanes, isoprenoids, steranes and triterpanes) were determined using gas chromatography - mass spectrometry (GC MS) and gas chromatography mass spectrometry - mass spectrometry (GC MS MS). Aromatic hydrocarbons (phenanthrene, methylphenanthrenes, methyl-dibenzothiophenes and trimethyl-naphtalenes) were analyzed by GC-MS. The Intisar crude oils were generated from siliciclastic source rocks containing a mixture of marine and terrestrial organic matter. Maturation parameters indicated high level of thermal maturity corresponding to the main phase of oil generation. The analysis of the age-specific biomarker ratios suggested Cretaceous, most probably Lower Cretaceous age for the Intisar oils. Two source rocks for the Intisar o...ils were identified, similar in the precursor organic matter type, lithology, maturity and geologic age but different in the redox conditions in the environment during their deposition. The oils generated from these different sources probably migrated over different migration pathways.

Keywords:
Crude oils / Sirte Basin / Intisar oil field / Organic geochemical characterization
Source:
Journal of Petroleum Science and Engineering, 2016, 147, 605-616
Publisher:
  • Elsevier Science Bv, Amsterdam
Projects:
  • Geochemical investigations of sedimentary rocks - fossil fuels and environmental pollutants (RS-176006)

DOI: 10.1016/j.petrol.2016.09.030

ISSN: 0920-4105

WoS: 000388630900058

Scopus: 2-s2.0-84995602261
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/1946
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