STRUCTURAL STYLE AND TIMING OF NW-SE TRENDING ZAGROS FOLDS IN SW IRAN: INTERACTION WITH NORTH-SOUTH TRENDING ARABIAN FOLDS AND IMPLICATIONS FOR PETROLEUM GEOLOGY

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Jaume Vergés, Giulio Casini, Jonas Ruh, John Cosgrove, Shahram Sherkati, Mahdi Najafi, Emilio Casciello, Eduard Saura, Iraj Abdollahie Fard, Alireza Piryaei, Dominique Frizon de Lamotte, Jean Letouzey, Hasan Goodarzi, Bahman Soleimany, Salman Jahani
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引用次数: 0

Abstract

The Zagros foldbelt – foreland system in SW Iran is a prolific hydrocarbon province with known reserves of more than 90 billion brl of oil and 800 TCF of natural gas. Establishing the structural style of folding in the Zagros area presents a major challenge due both to the geographical extent of the foldbelt, which is some 1600 km long in total, and the presence of marked lateral variations in fold style related to the complex regional tectonic history. In addition, while numerous high-quality structural studies of the Zagros have been completed over the last 20 years, they support a variety of different interpretations and are therefore $$difficult to synthesize. In this paper, we review the general structural style of the Zagros fold-and-thrust belt in SW Iran, and in particular the style of folding in the Lurestan arc, Dezful embayment, Izeh Zone and Fars arc. We summarise relationships between folding in these areas and fracture development, and investigate the timing of folding and the interaction between NW-SE oriented “Zagros” folds and north-south oriented “Arabian” folds. Finally, we briefly assess the implications of fold style for petroleum systems in the Zagros area. Although no new data are presented in this paper, a series of unpublished maps are used to illustrate the main results and include: a map showing the extent of the main detachment levels across the Lurestan, Dezful and Fars structural domains; two palaeotectonic maps (for Late Cretaceous – Paleocene and Miocene – Pliocene times, respectively), showing the position of the deformation fronts of the Zagros and the North Oman thrust systems and their potential spatial and temporal relationship with folding; and a set of four maps showing the distribution of reservoir rocks which are grouped by age into the Permian – Triassic Dehram Group, the Late Jurassic – Early Cretaceous Khami Group, the Late Cretaceous Bangestan Group, and the Oligocene – Miocene Asmari Formation. In addition, for the Lurestan, Dezful and Fars structural domains, a series of regional cross-sections at the same scale are presented and discussed.

Most of the data in this review paper were acquired in order to gain an improved understanding of the petroleum systems in the Zagros area; however the data are used here to investigate a range of interacting processes including tectonics, sediment deposition and subsurface fluid flow in the development of the fold-and-thrust belt and its associated foreland basins. The resulting synthesis is intended to provice a starting point for future tectonostratigraphic and hydrocarbon-related studies which will make use of both existing and new multidisciplinary techniques to constrain the results. The knowledge acquired and the techniques used will be of benefit in future challenges including the identification of subsurface reservoirs suitable for the permanent storage of CO2 to mitigate the effects of climate change.

伊朗西南部西北-东南走向的扎格罗斯褶皱的构造样式和时间:与南北走向的阿拉伯褶皱的相互作用及其对石油地质学的影响
伊朗西南部的扎格罗斯褶皱带-前陆系统是一个油气资源丰富的地区,已知石油储量超过 900 亿桶,天然气储量超过 8000 万亿立方英尺。扎格罗斯地区褶皱的构造风格是一项重大挑战,因为褶皱带的地理范围总长约 1600 公里,而且褶皱风格存在明显的横向变化,这与复杂的区域构造历史有关。此外,虽然在过去 20 年中完成了大量高质量的扎格罗斯构造研究,但这些研究支持各种不同的解释,因此很难进行综合。在本文中,我们回顾了伊朗西南部扎格罗斯褶皱-推力带的总体构造风格,特别是卢雷斯坦弧区、代兹富勒海湾、伊泽区和法尔斯弧区的褶皱风格。我们总结了这些地区的褶皱与断裂发育之间的关系,并研究了褶皱的时间以及西北-东南走向的 "扎格罗斯 "褶皱与南北走向的 "阿拉伯 "褶皱之间的相互作用。最后,我们简要评估了褶皱类型对扎格罗斯地区石油系统的影响。虽然本文没有提供新数据,但使用了一系列未出版的地图来说明主要结果,其中包括一张显示 Lurestan、Dezful 和 Fars 构造域主要剥离层范围的地图;两张古构造图(分别为晚白垩世-古新世和中新世-上新世时期),显示了扎格罗斯和北阿曼推力系统变形前沿的位置及其与褶皱的潜在时空关系;一组四幅地图显示了储层岩石的分布情况,按年代分为二叠纪-三叠纪 Dehram 组、晚侏罗世-早白垩世 Khami 组、晚白垩世 Bangestan 组和渐新世-中新世 Asmari 组。此外,对于 Lurestan、Dezful 和 Fars 构造域,还提出并讨论了一系列相同尺度的区域横断面。
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来源期刊
Journal of Petroleum Geology
Journal of Petroleum Geology 地学-地球科学综合
CiteScore
3.40
自引率
11.10%
发文量
22
审稿时长
6 months
期刊介绍: Journal of Petroleum Geology is a quarterly journal devoted to the geology of oil and natural gas. Editorial preference is given to original papers on oilfield regions of the world outside North America and on topics of general application in petroleum exploration and development operations, including geochemical and geophysical studies, basin modelling and reservoir evaluation.
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