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SINCE 1984
Oil Shale cover
Oil Shale
ISSN 1736-7492 (Electronic)
ISSN 0208-189X (Print)
Impact Factor (2021): 1.442
PDF | doi: 10.3176/oil.2008.4.05

In this study, organic geochemical characteristics and depositional environ­ment of the Tertiary-aged oil shale deposits in Northwest Anatolia have been examined. Oil shales in all the studied areas are typically characterized by high hydrogen index and low oxygen index values. Beypazarı, Himmetoğlu, Gölpazarı and Bahçecik oil shales contain only Type I kerogen. Seyitömer and Hatıldağ shales contain dominantly Type I and minor amounts of Type II kerogen. Gas chromatography of Beypazarı and Seyitömer oil shales shows only C17 and C18 n-alkanes but no other n-alkanes. Gas chromatography of Himmetoğlu, Hatıldağ, Gölpazarı and Bahçecik oil shales shows a bimodal distribution dominated by low-number n-alkanes. Pristan/Phytan (Pr/Ph) ratios of the shales suggest an anoxic depositional environment for Beypazarı, Seyitömer and Hatıldağ and a suboxic environment for Himmetoğlu, Gölpazarı and Bahçecik oil shales. Tmax values indicate that oil shales are immature. In addition to gas chromatograms, the biomarker parameters measured using m/z 217 and m/z 191 mass chromatograms indicate that the oil shales contain immature organic matter. Gammacerane, a typical biomarker for saline depositional environment, has been determined in all the oil shales. When other biomarker parameters are taken into account, it is apparent that all the shale samples have been deposited in a saline environment. In general, the data obtained by geochemical analyses indicate a lacustrine depositional environment for all of the shale samples in the studied areas.

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