Petroleum geochemistry of the Albian-Turonian Sarvak reservoir in one of the oil fields of southwest Iran

Organic geochemical investigations using thin layer chromatography-flame ionization detection (TLC-FID), Gas Chromatography (GC), Gas Chromatography-Mass Spectrometry (GC-MS), API gravimetry, elemental analysis, and isotope-ratio mass spectrometry (IR-MS) were carried out on eleven oil samples from...

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Main Authors: Milad Zohrevand, Ali Shekarifard, Vahid Tavakoli
Format: Article
Language:English
Published: Reaserch Institute of Petroleum Industry 2020-07-01
Series:Journal of Petroleum Science and Technology
Subjects:
Online Access:https://jpst.ripi.ir/article_1084_193ba4d106a9bf5f7dfb61f8afebc772.pdf
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author Milad Zohrevand
Ali Shekarifard
Vahid Tavakoli
author_facet Milad Zohrevand
Ali Shekarifard
Vahid Tavakoli
author_sort Milad Zohrevand
collection DOAJ
description Organic geochemical investigations using thin layer chromatography-flame ionization detection (TLC-FID), Gas Chromatography (GC), Gas Chromatography-Mass Spectrometry (GC-MS), API gravimetry, elemental analysis, and isotope-ratio mass spectrometry (IR-MS) were carried out on eleven oil samples from the Sarvak reservoir in the Abadan Plain (SW Iran). Oil chemical composition, source, thermal maturity, age, lithology, and depositional environment of these oils’ source rock were determined in this study. Moreover, Sarvak oils are mainly naphthenic and paraffinic type. Their API degree between 16.2 and 20.14 and about 4.6% sulfur content indicate heavy and sulfur-rich oils. The results of the study of biomarkers, stable carbon isotope composition, trace elements, aromatic and sulfur content indicated that all oil samples are related to a marine-carbonate source rock with strongly anoxic conditions. The absence of oleanane in all oil samples, the variation of Pr/Ph versus δ13C of the whole oil, and C28/C29 steranes versus geological age proved that these oils had been produced earlier than the Late Cretaceous. Furthermore, the distribution of n-paraffins, calculation of Rc (%) from aromatic compounds, CPI (Carbon Preference Index) from gas chromatograms, and biomarker maturity indices indicated that the Sarvak oils are mature. Although the Sarvak oils are heavy, they show approximately maturity of peak oil-generative window, which represents a challenge in this study. It is guessed that the high sulfur content and low API gravity in the Sarvak reservoir oils are due to the presence of sulfur-rich organic matter (type IIS kerogen) in the source rock.
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spelling doaj.art-48ec6451dad4491b85d92009344822b42022-12-21T18:53:04ZengReaserch Institute of Petroleum IndustryJournal of Petroleum Science and Technology2251-659X2645-33122020-07-01103395210.22078/jpst.2020.4094.16621084Petroleum geochemistry of the Albian-Turonian Sarvak reservoir in one of the oil fields of southwest IranMilad Zohrevand0Ali Shekarifard1Vahid Tavakoli2School of Geology, College of Science, University of Tehran, Tehran, IranOil and Gas Engineering Group, School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran\Institute of Petroleum Engineering (IPE), College of Engineering, University of Tehran, Tehran, IranSchool of Geology, College of Science, University of Tehran, Tehran, IranOrganic geochemical investigations using thin layer chromatography-flame ionization detection (TLC-FID), Gas Chromatography (GC), Gas Chromatography-Mass Spectrometry (GC-MS), API gravimetry, elemental analysis, and isotope-ratio mass spectrometry (IR-MS) were carried out on eleven oil samples from the Sarvak reservoir in the Abadan Plain (SW Iran). Oil chemical composition, source, thermal maturity, age, lithology, and depositional environment of these oils’ source rock were determined in this study. Moreover, Sarvak oils are mainly naphthenic and paraffinic type. Their API degree between 16.2 and 20.14 and about 4.6% sulfur content indicate heavy and sulfur-rich oils. The results of the study of biomarkers, stable carbon isotope composition, trace elements, aromatic and sulfur content indicated that all oil samples are related to a marine-carbonate source rock with strongly anoxic conditions. The absence of oleanane in all oil samples, the variation of Pr/Ph versus δ13C of the whole oil, and C28/C29 steranes versus geological age proved that these oils had been produced earlier than the Late Cretaceous. Furthermore, the distribution of n-paraffins, calculation of Rc (%) from aromatic compounds, CPI (Carbon Preference Index) from gas chromatograms, and biomarker maturity indices indicated that the Sarvak oils are mature. Although the Sarvak oils are heavy, they show approximately maturity of peak oil-generative window, which represents a challenge in this study. It is guessed that the high sulfur content and low API gravity in the Sarvak reservoir oils are due to the presence of sulfur-rich organic matter (type IIS kerogen) in the source rock.https://jpst.ripi.ir/article_1084_193ba4d106a9bf5f7dfb61f8afebc772.pdfcrude oil inversionbiomarkerssarvak reservoirabadan plainsouthwest iran
spellingShingle Milad Zohrevand
Ali Shekarifard
Vahid Tavakoli
Petroleum geochemistry of the Albian-Turonian Sarvak reservoir in one of the oil fields of southwest Iran
Journal of Petroleum Science and Technology
crude oil inversion
biomarkers
sarvak reservoir
abadan plain
southwest iran
title Petroleum geochemistry of the Albian-Turonian Sarvak reservoir in one of the oil fields of southwest Iran
title_full Petroleum geochemistry of the Albian-Turonian Sarvak reservoir in one of the oil fields of southwest Iran
title_fullStr Petroleum geochemistry of the Albian-Turonian Sarvak reservoir in one of the oil fields of southwest Iran
title_full_unstemmed Petroleum geochemistry of the Albian-Turonian Sarvak reservoir in one of the oil fields of southwest Iran
title_short Petroleum geochemistry of the Albian-Turonian Sarvak reservoir in one of the oil fields of southwest Iran
title_sort petroleum geochemistry of the albian turonian sarvak reservoir in one of the oil fields of southwest iran
topic crude oil inversion
biomarkers
sarvak reservoir
abadan plain
southwest iran
url https://jpst.ripi.ir/article_1084_193ba4d106a9bf5f7dfb61f8afebc772.pdf
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AT vahidtavakoli petroleumgeochemistryofthealbianturoniansarvakreservoirinoneoftheoilfieldsofsouthwestiran