Fracture distribution along open folds in Southern Tunisia: Implications for naturally fractured reservoirs

IF 1.9 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Petroleum Geoscience Pub Date : 2023-11-06 DOI:10.1144/petgeo2023-039

Ruaridh Y. Smith, Pierre-Olivier Bruna, Ahmed Nasri, Giovanni Bertotti

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引用次数: 0

Abstract

Fracture networks play a critical role in fluid flow within reservoirs, and it is therefore important to understand the interactions and influences these networks have. Our study focusses on the Southern Chotts-Jeffara basin which hosts reservoirs within the Triassic, Permian and Ordovician units containing significant hydrocarbon accumulations. Recent developments on the structural understanding of the basin have proven a regional shortening phase occurring between the Permian and Jurassic forming open folds and a distributed fracture network. Analysis of late Palaeozoic and Mesozoic outcrops within the basin identify several sets of fractures (150/80; 212/86) and compressional structural features which support this shortening hypothesis. We integrate fracture data from surface analogues and subsurface analysis of advanced seismic attributes and well data through structural linking to form a 2D hybrid fracture model of the reservoirs in the region. Through analytical aperture modelling and numerical simulation, we find that the fractures orientated 212° in combination with large-scale fractures contribute significantly to the fluid flow orientation and potential reservoir permeability. Our presented fracture workflow and framework provides an insight in network characterisation within naturally fractured reservoirs of Tunisia and how certain structures form fluid pathways influence flow and production. Supplementary material: https://doi.org/10.6084/m9.figshare.c.6904499

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突尼斯南部沿开放褶皱的裂缝分布:对天然裂缝性储层的影响

裂缝网络在储层流体流动中起着至关重要的作用，因此了解裂缝网络的相互作用和影响非常重要。我们的研究主要集中在南chottts - jeffara盆地，该盆地的储层位于三叠纪、二叠纪和奥陶系，具有重要的油气聚集。近年来对盆地构造认识的最新进展表明，在二叠系和侏罗系之间存在一个区域缩短期，形成开放褶皱和分布裂缝网络。对盆地内晚古生代和中生代露头进行分析，确定了几组裂缝(150/80;212/86)和挤压构造特征支持这种缩短假说。通过结构连接，我们将地面模拟裂缝数据、地下先进地震属性分析数据和井数据整合在一起，形成该地区储层的二维混合裂缝模型。通过解析孔径建模和数值模拟发现，212°定向裂缝与大型裂缝的结合对流体流向和储层潜在渗透率有重要影响。我们提出的裂缝工作流程和框架为突尼斯天然裂缝油藏的网络特征提供了见解，以及某些结构形成的流体通道如何影响流动和生产。补充资料:https://doi.org/10.6084/m9.figshare.c.6904499

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来源期刊

Petroleum Geoscience 地学-地球科学综合

CiteScore

4.80

自引率

11.80%

发文量

审稿时长

>12 weeks

期刊介绍： Petroleum Geoscience is the international journal of geoenergy and applied earth science, and is co-owned by the Geological Society of London and the European Association of Geoscientists and Engineers (EAGE). Petroleum Geoscience transcends disciplinary boundaries and publishes a balanced mix of articles covering exploration, exploitation, appraisal, development and enhancement of sub-surface hydrocarbon resources and carbon repositories. The integration of disciplines in an applied context, whether for fluid production, carbon storage or related geoenergy applications, is a particular strength of the journal. Articles on enhancing exploration efficiency, lowering technological and environmental risk, and improving hydrocarbon recovery communicate the latest developments in sub-surface geoscience to a wide readership. Petroleum Geoscience provides a multidisciplinary forum for those engaged in the science and technology of the rock-related sub-surface disciplines. The journal reaches some 8000 individual subscribers, and a further 1100 institutional subscriptions provide global access to readers including geologists, geophysicists, petroleum and reservoir engineers, petrophysicists and geochemists in both academia and industry. The journal aims to share knowledge of reservoir geoscience and to reflect the international nature of its development.