Organic geochemical characteristics and depositional environment of Lower-Middle Miocene Kucukkuyu Formation, Edremit Gulf, NW Turkey

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dc.contributor.authorBozcu, Ayse
dc.date.accessioned2025-01-27T20:47:43Z
dc.date.available2025-01-27T20:47:43Z
dc.date.issued2017
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractThe Lower-Middle Miocene Kucukkuyu Formation crops out extensively in the Edremit Gulf area (NW Turkey). In this study, shale samples from this unit were investigated to evaluate source rock characteristics, depositional conditions, and hydrocarbon potential. Outcrop samples of the Kucukkuyu Formation were taken from different locations and analyzed by Rock-Eval pyrolysis, vitrinite reflectance (R-o), stable carbon isotope (delta C-13), total sulfur (TS), gas chromatography (GC), and gas chromatography-mass spectrometry (GC-MS). The total organic carbon (TOC) values range from 0.23 to 6.1 wt.% with an average of 1.76 wt.% for the northern samples and 0.24 to 2.82 wt.% with an average of 1.66 wt.% for the southern samples around the Edremit Gulf. Hydrogen index (HI) values were up to 606 and 712 mg HC/g TOC in the north and south of the gulf, respectively. Organic matter type in the formation consists predominantly of Type II and III kerogen with a minor component of Type I kerogen. Tmax values ranging from 414 to 496 degrees C in the north and 423 to 446 degrees C in the south of the gulf indicate that most samples are at the beginning of the oil generation window and are thermally immature or early-mid-mature. Vitrinite reflectance (R-o) and biomarker maturity parameters support this result. Based on geological observations, biomarker distributions, and TOC/TS ratios, the Kucukkuyu Formation was deposited in a freshwater to slightly brackish water environment under anoxic-suboxic conditions with organic matter input from aquatic organisms and from terrestrial higher plants. According to Rock-Eval pyrolysis data, the Kucukkuyu Formation mostly has medium to good hydrocarbongeneration potential. However, as these potential source rocks are in general immature and/or early-mature, the hydrocarbon potential of the study area is very limited.
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK) [113Y033]; canakkale Onsekiz Mart University Scientific Research Foundation (COMU-BAP) [2007/46, 2009/22, 2010/159]; Organic Geochemistry Laboratory, Turkish Petroleum Corporation (TPAO)
dc.description.sponsorshipThis study was supported by the Scientific and Technological Research Council of Turkey (TUBITAK, Project Number: 113Y033). Some of the analyses belong to different projects that were supported by the canakkale Onsekiz Mart University Scientific Research Foundation (COMU-BAP, Project Numbers: 2007/46, 2009/22, 2010/159). Analyses were performed in the Organic Geochemistry Laboratory, Turkish Petroleum Corporation (TPAO). The author thanks these organizations for their support. The author also thanks Dr Mustafa Bozcu for assistance during field work and Gulsah Durak for plotting graphs in the manuscript. The author is also grateful to the subject editor and both anonymous reviewers for their time and constructive suggestions.
dc.identifier.doi10.3906/yer-1703-23
dc.identifier.endpage376
dc.identifier.issn1300-0985
dc.identifier.issue5
dc.identifier.scopus2-s2.0-85034455843
dc.identifier.scopusqualityQ2
dc.identifier.startpage354
dc.identifier.urihttps://doi.org/10.3906/yer-1703-23
dc.identifier.urihttps://hdl.handle.net/20.500.12428/25022
dc.identifier.volume26
dc.identifier.wosWOS:000416109300002
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherTubitak Scientific & Technological Research Council Turkey
dc.relation.ispartofTurkish Journal of Earth Sciences
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20250125
dc.subjectKucukkuyu Formation
dc.subjectLower-Middle Miocene
dc.subjectsource rock
dc.subjectEdremit Gulf
dc.subjectNW Turkey
dc.titleOrganic geochemical characteristics and depositional environment of Lower-Middle Miocene Kucukkuyu Formation, Edremit Gulf, NW Turkey
dc.typeArticle

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