Geochemical evaluation of Khami Group oils in the South Dezful Embayment, Iran
Abstract An integrated geochemical study, including GC, GC–MS and stable carbon isotope analyses, was conducted on a suite of oil samples from the Khami Group reservoirs to provide new insights into the Upper Jurassic–Lower Cretaceous petroleum system in the South Dezful Embayment. Possible source r...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2020-09-01
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| Series: | Journal of Petroleum Exploration and Production Technology |
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| Online Access: | https://doi.org/10.1007/s13202-020-00894-5 |
| _version_ | 1811200986906099712 |
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| author | Bahram Alizadeh Amir Abbas Jahangard Majid Alipour Ahmadreza Gandomi Sani |
| author_facet | Bahram Alizadeh Amir Abbas Jahangard Majid Alipour Ahmadreza Gandomi Sani |
| author_sort | Bahram Alizadeh |
| collection | DOAJ |
| description | Abstract An integrated geochemical study, including GC, GC–MS and stable carbon isotope analyses, was conducted on a suite of oil samples from the Khami Group reservoirs to provide new insights into the Upper Jurassic–Lower Cretaceous petroleum system in the South Dezful Embayment. Possible source rocks were also characterized using Rock–Eval pyrolysis to address the likely potential source rocks. The oil samples representing four major reservoirs (Surmeh, Fahliyan, Gadvan and Dariyan) constitute a single genetic oil family according to bulk and biomarker parameters. High API (> 38°), highly saturated hydrocarbons (Sat > 65%), very low asphaltene content (Asp < 2%) and raised saturates/aromatics ratio (Sat/Aro > 2) are the bulk diagnostic characteristics of the studied oils implying more dominant terrigenous nature of the precursor organic matter. The predominance of C29 regular steranes (~ 40%), presence of C29Ts as well as very low gammacerane (< 10%) and moderate C35/C34 homohopane (< 1) are consistent with the mixed marine–terrigenous dysoxic organic matter input. The oils are assumed to be originated from Early Cretaceous source rocks at the peak of the oil generation window in a kitchen area located to the south of the studied region (i.e., the Binak–Borazjan Trough). The hydrocarbons were migrated from this kitchen to the structurally shallow-seated reservoirs in the center and west of the Kharg-Mish local paleo-high. The Khami Group reservoirs are not effectively sealed by the thin Hith anhydrites, and the Kazhdumi Formation finally trapped the migrated hydrocarbons. This study improves our knowledge regarding one of the active petroleum systems in the South Dezful Embayment, enhancing petroleum exploration success by navigating further drillings into the more prosperous targets. |
| first_indexed | 2024-04-12T02:13:35Z |
| format | Article |
| id | doaj.art-a2de5e464f674da0a5f17647f8aa2cf3 |
| institution | Directory Open Access Journal |
| issn | 2190-0558 2190-0566 |
| language | English |
| last_indexed | 2024-04-12T02:13:35Z |
| publishDate | 2020-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of Petroleum Exploration and Production Technology |
| spelling | doaj.art-a2de5e464f674da0a5f17647f8aa2cf32022-12-22T03:52:19ZengSpringerOpenJournal of Petroleum Exploration and Production Technology2190-05582190-05662020-09-011083241325410.1007/s13202-020-00894-5Geochemical evaluation of Khami Group oils in the South Dezful Embayment, IranBahram Alizadeh0Amir Abbas Jahangard1Majid Alipour2Ahmadreza Gandomi Sani3Department of Petroleum and Sedimentary Basins, Faculty of Earth Sciences, Shahid Chamran University of AhvazDepartment of Petroleum and Sedimentary Basins, Faculty of Earth Sciences, Shahid Chamran University of AhvazDepartment of Petroleum and Sedimentary Basins, Faculty of Earth Sciences, Shahid Chamran University of AhvazExploration Directorate, National Iranian Oil Company (NIOC EXP)Abstract An integrated geochemical study, including GC, GC–MS and stable carbon isotope analyses, was conducted on a suite of oil samples from the Khami Group reservoirs to provide new insights into the Upper Jurassic–Lower Cretaceous petroleum system in the South Dezful Embayment. Possible source rocks were also characterized using Rock–Eval pyrolysis to address the likely potential source rocks. The oil samples representing four major reservoirs (Surmeh, Fahliyan, Gadvan and Dariyan) constitute a single genetic oil family according to bulk and biomarker parameters. High API (> 38°), highly saturated hydrocarbons (Sat > 65%), very low asphaltene content (Asp < 2%) and raised saturates/aromatics ratio (Sat/Aro > 2) are the bulk diagnostic characteristics of the studied oils implying more dominant terrigenous nature of the precursor organic matter. The predominance of C29 regular steranes (~ 40%), presence of C29Ts as well as very low gammacerane (< 10%) and moderate C35/C34 homohopane (< 1) are consistent with the mixed marine–terrigenous dysoxic organic matter input. The oils are assumed to be originated from Early Cretaceous source rocks at the peak of the oil generation window in a kitchen area located to the south of the studied region (i.e., the Binak–Borazjan Trough). The hydrocarbons were migrated from this kitchen to the structurally shallow-seated reservoirs in the center and west of the Kharg-Mish local paleo-high. The Khami Group reservoirs are not effectively sealed by the thin Hith anhydrites, and the Kazhdumi Formation finally trapped the migrated hydrocarbons. This study improves our knowledge regarding one of the active petroleum systems in the South Dezful Embayment, enhancing petroleum exploration success by navigating further drillings into the more prosperous targets.https://doi.org/10.1007/s13202-020-00894-5South Dezful EmbaymentKhami group oilsPetroleum systemOil family classificationBiomarkerCarbon isotope ratio |
| spellingShingle | Bahram Alizadeh Amir Abbas Jahangard Majid Alipour Ahmadreza Gandomi Sani Geochemical evaluation of Khami Group oils in the South Dezful Embayment, Iran Journal of Petroleum Exploration and Production Technology South Dezful Embayment Khami group oils Petroleum system Oil family classification Biomarker Carbon isotope ratio |
| title | Geochemical evaluation of Khami Group oils in the South Dezful Embayment, Iran |
| title_full | Geochemical evaluation of Khami Group oils in the South Dezful Embayment, Iran |
| title_fullStr | Geochemical evaluation of Khami Group oils in the South Dezful Embayment, Iran |
| title_full_unstemmed | Geochemical evaluation of Khami Group oils in the South Dezful Embayment, Iran |
| title_short | Geochemical evaluation of Khami Group oils in the South Dezful Embayment, Iran |
| title_sort | geochemical evaluation of khami group oils in the south dezful embayment iran |
| topic | South Dezful Embayment Khami group oils Petroleum system Oil family classification Biomarker Carbon isotope ratio |
| url | https://doi.org/10.1007/s13202-020-00894-5 |
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