Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.13091/616
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dc.contributor.authorGharib, Abbas F.-
dc.contributor.authorÖzkan, Ali M.-
dc.contributor.authorHakimi, Mohammed Hail-
dc.contributor.authorAbidin, Nor Syazwani Zainal-
dc.contributor.authorLashin, Aref A.-
dc.date.accessioned2021-12-13T10:29:44Z-
dc.date.available2021-12-13T10:29:44Z-
dc.date.issued2021-
dc.identifier.issn0264-8172-
dc.identifier.issn1873-4073-
dc.identifier.urihttps://doi.org/10.1016/j.marpetgeo.2021.104930-
dc.identifier.urihttps://hdl.handle.net/20.500.13091/616-
dc.description.abstractThe current study focuses on the organic geochemical and basin modeling of organic matter-rich limestones and oil samples from the Ajeel Oilfield. The objective was to characterize the organic matter and its hydrocarbon-generating potential, and its relevance to future hydrocarbon exploration in the northwestern Mesopotamian Basin. The organic biomarker results of the extracted bitumen samples indicated that the Sargelu, Naokelekan, and Chia Gara limestones received abundant planktonic-bacterial organic matter input, with a limited terrestrial contribution. Lipid-rich organic matter that originates from phytoplankton and bacteria with low amounts of terrestrial organic matter suggest a high abundance of Type-II or mixed-II/III kerogen as the original organic matter at time of sedimentation. Bulk property and geochemical analyses of the recovered oil samples, with mediumAPI gravities between 31 and 33 degrees, and relatively high sulfur concentrations of up to 3.95 wt%, suggest that examined oil samples were derived mainly from Type II-S kerogen at moderate maturity stages. Biomarker ratios and parameters, as well as carbon isotopes, further indicated that these oils were derived from marine carbonate-rich source rocks deposited under reducing environmental conditions. These biomarker fingerprints and carbon isotopes show a genetic link between the oil examined samples and the extracted rocks of the Sargelu, Naokelekan, and Chia Gara source rocks and represent a mix of these carbonate-rich source rocks. Therefore, these source rocks contained kerogen Type II-S with high sulfur, and generated commercial oil at relatively low thermal maturity of early to moderate stages, as demonstrated from maturity parameters such as T-max and PI as well as several biomarker ratios. Burial/maturity models with kerogen Type-II-S kinetic parameter revealed that the Sargelu, Naokelekan, and Chia Gara intervals began to generate oil at slightly lower thermal maturity (maturity levels = 0.55-0.79 EASY% Ro). As a result, about 10%-50% of the organic-matter was converted to oil during the Late Paleocene. The basin models also suggested that the organic-rich units including Sargelu and Naokelekan source rocks reached higher maturity levels, with TR of 71%-79% in the Early Miocene (20 Ma) and continued to the present. Trapping large quantities of oil lead to the high pressures and expulsion of these oils. The high conversion ratios further suggested large oil volumes accumulated in the northwestern Mesopotamian Basin were mainly originated from the Middle-Late Jurassic Sargelu and Naokelekan source rocks.en_US
dc.description.sponsorshipKing Saud University, Riyadh, Saudi ArabiaKing Saud University [RSP-2020/92]en_US
dc.description.sponsorshipThe research material, technical support, and documentation were provided from the North Oil Company NOC (Kirkuk, Iraq) and this is appreciatively acknowledged. The authors acknowledge the Schlum-berger Company for providing a 1D PetroMod software (offered from the Schlumberger website). The authors extend their sincere appreciation to the Researchers Supporting Project number (RSP-2020/92), King Saud University, Riyadh, Saudi Arabia. We kindly acknowledged Drs. Barry J. Katz and Guangli Wang for their critical comments and suggestions that helped us improved the original manuscript.en_US
dc.language.isoenen_US
dc.publisherELSEVIER SCI LTDen_US
dc.relation.ispartofMARINE AND PETROLEUM GEOLOGYen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectOrganic matter-rich limestoneen_US
dc.subjectGeochemical correlationsen_US
dc.subjectCarbon isotopeen_US
dc.subjectBiomarker fingerprintsen_US
dc.subjectBasin modelingen_US
dc.subjectAjeel oilfielden_US
dc.subjectNorthwestern mesopotamian basinen_US
dc.titleIntegrated geochemical characterization and geological modeling of organic matter-rich limestones and oils from Ajeel Oilfield in Mesopotamian Basin, Northern Iraqen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.marpetgeo.2021.104930-
dc.identifier.scopus2-s2.0-85100983910en_US
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Jeoloji Mühendisliği Bölümüen_US
dc.authoridLashin, Aref/0000-0002-1834-3234-
dc.authorwosidLashin, Aref/E-8686-2019-
dc.authorwosidGharib, Abbas F./ABD-2473-2021-
dc.identifier.volume126en_US
dc.identifier.wosWOS:000620924100001en_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.authorscopusid57219979610-
dc.authorscopusid55079324000-
dc.authorscopusid26534261700-
dc.authorscopusid57193573317-
dc.authorscopusid27967768700-
dc.identifier.scopusqualityQ1-
item.openairetypeArticle-
item.languageiso639-1en-
item.cerifentitytypePublications-
item.grantfulltextembargo_20300101-
item.fulltextWith Fulltext-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
crisitem.author.dept02.07. Department of Geological Engineering-
Appears in Collections:Mühendislik ve Doğa Bilimleri Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections
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