Source rock characterizations of the Devonian to Permian strata in the Persian Gulf Basin, SW Iran

IF 2.2 4区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of African Earth Sciences Pub Date : 2025-07-03 DOI:10.1016/j.jafrearsci.2025.105755

Ebrahim Sfidari , Mohammad Sharifi , Khaled Maroufi , Seyed Mohamad Zamanzadeh , Javad Amraie , Houshang Mehrabi , Amalia Spina

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引用次数: 0

Abstract

The Devonian to lower-middle Permian siliciclastic strata (Zakeen and Faraghan formations) of the South Pars supergiant gas field (Persian Gulf offshore) were geochemically examined to evaluate their petroleum potential. The study was conducted on the deepest appraisal well in the Iranian sector of the Persian Gulf, using an integrated approach combining Rock-Eval pyrolysis and optical kerogen analyses (Vitrinite Reflectance-VR, Spore Color Index-SCI, Palynomorph Darkness Index-PDI, and palynofacies analyses), along with one-dimensional burial history reconstruction and thermal modeling.

Generally, the low Total Organic Carbon (TOC) content in most parts of the studied formations categorizes them as poor source rocks. However, the geochemical results identified a new source rock interval, Zone-A, with high hydrocarbon generation potential. This interval is introduced as a new gas-prone prospective horizon within the Persian Gulf, deposited through a deltaic to relatively marine suboxic-anoxic environment.

Our findings suggest that Zone-A has been producing hydrocarbons since the late Eocene, indicating additional undiscovered reserves in the region. This research highlights the significance of further exploration and resource assessment in the area.

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伊朗西南部波斯湾盆地泥盆系—二叠系烃源岩特征

对波斯湾海域南帕尔斯特大气田泥盆系—中下二叠统（Zakeen组和Faraghan组）的硅屑地层进行了地球化学研究，评价了其含油气潜力。该研究是在波斯湾伊朗地区最深的评价井上进行的，采用了综合方法，结合岩石热解和光学烃根分析（镜质体反射率- vr，孢子颜色指数- sci，孢暗指数- pdi和孢相分析），以及一维埋藏历史重建和热建模。总的来说，研究的大部分地层的总有机碳（TOC）含量较低，属于低烃源岩。然而，地球化学结果发现了一个新的烃源岩层段——a区，具有较高的生烃潜力。该层段是波斯湾内一个新的易产气远景层，通过三角洲沉积到相对海洋的缺氧-缺氧环境。我们的研究结果表明，a区自始新世晚期以来一直在生产油气，这表明该地区还有额外的未发现储量。本研究突出了该区进一步勘探和资源评价的意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of African Earth Sciences 地学-地球科学综合

CiteScore

4.70

自引率

4.30%

发文量

240

审稿时长

12 months

期刊介绍： The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.