与波斯湾中部和北部三叠纪碳酸盐岩储层质量有关的地层框架和成岩特征

IF 1.1 4区 地球科学 Q3 GEOLOGY
Marjan Mohammadi, Ali Kadkhodaie, Hossain Rahimpour-Bonab, Rahim Kadkhodaie, Mohsen Aleali
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引用次数: 0

摘要

伊朗南部和波斯湾的早三叠世 Kangan 地层相当于阿拉伯邻国的上 Khuff 地层,在波斯湾蕴藏着丰富的天然气资源。本研究在从波斯湾中部到北部的一个剖面上,在层序地层框架内讨论了三叠纪康干地层的沉积面、成因、沉积环境和储层特征。为此,利用四口井的测井记录、岩心和薄片进行了综合分析。在这方面,确定了代表浅海碳酸盐岩斜坡环境中从潮间带到泻湖和屏障(浅滩)环境的四个层带的 15 个微层。康干岩层经历了海洋、流星和埋藏成因,白云石化、溶解和胶结作用严重影响了其储层质量。通过对沉积和岩石物理特征的分析,确认了三个三阶和七个四阶沉积序列。该单元自下三叠世以来持续而复杂的成岩历史,通过重塑孔隙类型、大小和几何形状,极大地改变了储层质量。白云石化和溶解明显改善了波斯湾中部康干岩层的储层质量。然而,在波斯湾北部,以胶结物、结核和夹层形式存在的无水岩对储层质量产生了不利影响。因此,Kangan 地层在扎格罗斯沿海法尔斯构造带表现为致密的碳酸盐气藏。因此,可以将沿海法尔斯和波斯湾北部视为大规模古斜坡环境(内斜坡)的内部部分,而波斯湾中部则位于其中间斜坡和盆地环境中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Stratigraphic framework and diagenetic features related to reservoir quality of the triassic carbonates in central to northern Persian Gulf

Stratigraphic framework and diagenetic features related to reservoir quality of the triassic carbonates in central to northern Persian Gulf

The Early Triassic Kangan Formation in southern Iran and Persian Gulf, equivalent to the Upper Khuff Formation in the neighboring Arab countries hosts vast natural gas resources in the Persian Gulf. The current study discusses sedimentary facies, diagenesis, depositional setting and reservoir characteristics of the Triassic Kangan Formation within a sequence stratigraphic framework across a section passing from the central to northern Persian Gulf. For this purpose, a comprehensive analysis was conducted using well logs, cores and thin sections from four wells. In this respect, fifteen microfacies representing four facies’ belts ranging from peritidal to lagoon and barrier (shoal) settings of a shallow marine carbonate ramp environment were identified. The Kangan Formation has undergone marine, meteoric and burial diagenesis severely impacting its reservoir quality through dolomitization, dissolution and cementation. Analysis of sedimentological and petrophysical characteristics enabled the recognition of three third-order and seven fourth-order depositional sequences. This unit’s persistent and complex diagenetic history, spanning since the Lower Triassic, has significantly altered reservoir quality by reshaping pore types, size and geometry. Dolomitization and dissolution have notably improved the reservoir quality of the Kangan Formation in the central Persian Gulf. However, towards the northern Persian Gulf, the presence of anhydrite in the form of cement, nodules and interbeds has adversely affected reservoir quality. Consequently, the Kangan Formation behaves as a tight gas carbonate reservoir in the Coastal Fars structural zone of Zagros. Therefore, the Coastal Fars and the northern Persian Gulf can be conceptualized as the inner part of a large-scale paleo-ramp environment (inner ramp), whereas the central Persian Gulf lies within its mid-ramp and basin environment.

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来源期刊
Carbonates and Evaporites
Carbonates and Evaporites 地学-地质学
CiteScore
2.80
自引率
14.30%
发文量
70
审稿时长
3 months
期刊介绍: Established in 1979, the international journal Carbonates and Evaporites provides a forum for the exchange of concepts, research and applications on all aspects of carbonate and evaporite geology. This includes the origin and stratigraphy of carbonate and evaporite rocks and issues unique to these rock types: weathering phenomena, notably karst; engineering and environmental issues; mining and minerals extraction; and caves and permeability. The journal publishes current information in the form of original peer-reviewed articles, invited papers, and reports from meetings, editorials, and book and software reviews. The target audience includes professional geologists, hydrogeologists, engineers, geochemists, and other researchers, libraries, and educational centers.
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