Genetic classification and geochemical evaluation of Upper Cretaceous carbonate reservoir oils in Dezful Embayment and Abadan Plain, SW Iran
Abstract The Upper Cretaceous carbonate reservoir oils from the Abadan Plain and Dezful Embayment in southwest Iran underwent analysis utilizing GC, GC-MS, and stable carbon isotope methods to elucidate the regional genetic oil family distribution. The study encompassed oil-source rock correlation t...
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| Format: | Article |
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2025-02-01
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| Series: | Journal of Petroleum Exploration and Production Technology |
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| Online Access: | https://doi.org/10.1007/s13202-025-01936-6 |
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| author | Hossein Saadati Ali Kadkhodaie Mehrab Rashidi Hossein Bahrami Hashem Sarafdokht Dmitriy A. Martyushev Amir Abbass Jahangard |
| author_facet | Hossein Saadati Ali Kadkhodaie Mehrab Rashidi Hossein Bahrami Hashem Sarafdokht Dmitriy A. Martyushev Amir Abbass Jahangard |
| author_sort | Hossein Saadati |
| collection | DOAJ |
| description | Abstract The Upper Cretaceous carbonate reservoir oils from the Abadan Plain and Dezful Embayment in southwest Iran underwent analysis utilizing GC, GC-MS, and stable carbon isotope methods to elucidate the regional genetic oil family distribution. The study encompassed oil-source rock correlation through biomarker and stable carbon isotope ratios of Sargelu, Garau, Kazhdumi, and Pabdeh rock extracts to assist in establishing the best relevant source rock. Steranes and hopanes thermal maturity parameters were employed to define early maturity to the peak of oil generation level in the potential source rock. Equivalent vitrinite reflectances, estimated using aromatic compounds, suggest these paraffinic-naphthenic to aromatic-intermediate oils expelled from source rocks thermally matured from 0.68 to 0.85% Ro. The findings categorized the studied oils into families A and B. Family A oils, primarily associated with the Abadan Plain reservoirs, demonstrated a prevalence of more reducing conditions with a carbonate input predominance in early mature source rock. Family B oils originated from marl/shale facies in the Dezful Embayment, where the deeper source rock matured up to the peak of oil generation. Both hopanes and regular sterane distribution patterns reveal a contribution of terrigenous organic matter for both families. However, the δ13Csat and δ13Caro ratios demonstrate marine organic matter input predominance. The analysis emphasized the potential significance of the Kazhdumi Formation as the primary source rock for Family B oils in the Dezful Embayment. The Garau Formation was identified as the main candidate source rock, with the Sargelu and Kazhdumi Formations playing secondary roles to some extent in the generation of Family A oils. Additionally, the study underscored the impact of source rock maturity, organofacies, and trap formation timing as crucial factors influencing the geochemical characteristics of these reservoir oils across the studied area. |
| format | Article |
| id | doaj-art-f08cd4efe1274726b7f8112f8880b6d6 |
| institution | Kabale University |
| issn | 2190-0558 2190-0566 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of Petroleum Exploration and Production Technology |
| spelling | doaj-art-f08cd4efe1274726b7f8112f8880b6d62025-02-09T12:13:34ZengSpringerOpenJournal of Petroleum Exploration and Production Technology2190-05582190-05662025-02-0115212210.1007/s13202-025-01936-6Genetic classification and geochemical evaluation of Upper Cretaceous carbonate reservoir oils in Dezful Embayment and Abadan Plain, SW IranHossein Saadati0Ali Kadkhodaie1Mehrab Rashidi2Hossein Bahrami3Hashem Sarafdokht4Dmitriy A. Martyushev5Amir Abbass Jahangard6Department of Earth Science, Faculty of Natural Science, University of TabrizDepartment of Earth Science, Faculty of Natural Science, University of TabrizNational Iranian Oil Company, Exploration DirectorateNational Iranian Oil Company, Exploration DirectorateNational Iranian South Oil CompanyDepartment of Oil and Gas Technologies, Perm National Research Polytechnic UniversityDepartment of Geology, Faculty of Sciences, University of IsfahanAbstract The Upper Cretaceous carbonate reservoir oils from the Abadan Plain and Dezful Embayment in southwest Iran underwent analysis utilizing GC, GC-MS, and stable carbon isotope methods to elucidate the regional genetic oil family distribution. The study encompassed oil-source rock correlation through biomarker and stable carbon isotope ratios of Sargelu, Garau, Kazhdumi, and Pabdeh rock extracts to assist in establishing the best relevant source rock. Steranes and hopanes thermal maturity parameters were employed to define early maturity to the peak of oil generation level in the potential source rock. Equivalent vitrinite reflectances, estimated using aromatic compounds, suggest these paraffinic-naphthenic to aromatic-intermediate oils expelled from source rocks thermally matured from 0.68 to 0.85% Ro. The findings categorized the studied oils into families A and B. Family A oils, primarily associated with the Abadan Plain reservoirs, demonstrated a prevalence of more reducing conditions with a carbonate input predominance in early mature source rock. Family B oils originated from marl/shale facies in the Dezful Embayment, where the deeper source rock matured up to the peak of oil generation. Both hopanes and regular sterane distribution patterns reveal a contribution of terrigenous organic matter for both families. However, the δ13Csat and δ13Caro ratios demonstrate marine organic matter input predominance. The analysis emphasized the potential significance of the Kazhdumi Formation as the primary source rock for Family B oils in the Dezful Embayment. The Garau Formation was identified as the main candidate source rock, with the Sargelu and Kazhdumi Formations playing secondary roles to some extent in the generation of Family A oils. Additionally, the study underscored the impact of source rock maturity, organofacies, and trap formation timing as crucial factors influencing the geochemical characteristics of these reservoir oils across the studied area.https://doi.org/10.1007/s13202-025-01936-6Abadan plainDezful embaymentSarvak-Ilam reservoirsOil familiesBiomarkersStable carbon isotope ratios |
| spellingShingle | Hossein Saadati Ali Kadkhodaie Mehrab Rashidi Hossein Bahrami Hashem Sarafdokht Dmitriy A. Martyushev Amir Abbass Jahangard Genetic classification and geochemical evaluation of Upper Cretaceous carbonate reservoir oils in Dezful Embayment and Abadan Plain, SW Iran Journal of Petroleum Exploration and Production Technology Abadan plain Dezful embayment Sarvak-Ilam reservoirs Oil families Biomarkers Stable carbon isotope ratios |
| title | Genetic classification and geochemical evaluation of Upper Cretaceous carbonate reservoir oils in Dezful Embayment and Abadan Plain, SW Iran |
| title_full | Genetic classification and geochemical evaluation of Upper Cretaceous carbonate reservoir oils in Dezful Embayment and Abadan Plain, SW Iran |
| title_fullStr | Genetic classification and geochemical evaluation of Upper Cretaceous carbonate reservoir oils in Dezful Embayment and Abadan Plain, SW Iran |
| title_full_unstemmed | Genetic classification and geochemical evaluation of Upper Cretaceous carbonate reservoir oils in Dezful Embayment and Abadan Plain, SW Iran |
| title_short | Genetic classification and geochemical evaluation of Upper Cretaceous carbonate reservoir oils in Dezful Embayment and Abadan Plain, SW Iran |
| title_sort | genetic classification and geochemical evaluation of upper cretaceous carbonate reservoir oils in dezful embayment and abadan plain sw iran |
| topic | Abadan plain Dezful embayment Sarvak-Ilam reservoirs Oil families Biomarkers Stable carbon isotope ratios |
| url | https://doi.org/10.1007/s13202-025-01936-6 |
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