Fracture Spacing Variability and the Distribution of Fracture Patterns in Granitic Geothermal Reservoir: A Case Study in the Noble Hills Range (Death Valley, CA, USA)
Fracture Spacing Variability and the Distribution of Fracture Patterns in Granitic Geothermal Reservoir: A Case Study in the Noble Hills Range (Death Valley, CA, USA)
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花岗岩地热储层裂缝间距变化和裂缝模式分布：以诺布尔山山脉为例（美国加利福尼亚州死亡谷）
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发表时间：
2021
期刊：
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通讯作者：
B. Ledésert
中科院分区：
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作者：
A. Chabani;G. Trullenque;Johanne Klee;B. Ledésert
扫描线构成了一种强大的方法，可以更好地了解天然裂缝地热储层中裂缝网络的三维变化。本文旨在研究裂缝性花岗岩储层中裂缝的间距变化和分布规律，以及主要断裂对裂缝分布和流体循环的影响。名为Noble Hills（NH）范围的模拟目标位于死亡谷（DV，美国）。它被认为是目前在上莱茵河地堑（Soultz-sous-Forêts，法国东部）开采的地热储层的类似物。所采取的方法是基于10个扫描线位于NH从实地考察和虚拟（摄影测量模型）数据的中心部分的分析。我们的主要结果显示：（1）NE/SW、E/W和NW/SE断裂组是沿沿着虚拟扫描线记录的最多的方向;（2）NH内的间距分布表明，断裂组取决于断裂方向;（3）在高度变形区和靠近南部死亡谷断裂带（SDVFZ）和逆冲断层的地方，断裂系统的强烈聚集突出。此外，断裂模式受构造遗产的控制。在储层建模中应考虑两个主要因素：变形梯度和与区域主要断层的接近程度。
Scanlines constitute a robust method to better understand in 3D the fracture network variability in naturally fractured geothermal reservoirs. This study aims to characterize the spacing variability and the distribution of fracture patterns in a fracture granitic reservoir, and the impact of the major faults on fracture distribution and fluid circulation. The analogue target named the Noble Hills (NH) range is located in Death Valley (DV, USA). It is considered as an analogue of the geothermal reservoir presently exploited in the Upper Rhine Graben (Soultz-sous-Forêts, eastern of France). The methodology undertaken is based on the analyze of 10 scanlines located in the central part of the NH from fieldwork and virtual (photogrammetric models) data. Our main results reveal: (1) NE/SW, E/W, and NW/SE fracture sets are the most recorded orientations along the virtual scanlines; (2) spacing distribution within NH shows that the clustering depends on fracture orientation; and (3) a strong clustering of the fracture system was highlighted in the highly deformed zones and close to the Southern Death Valley fault zone (SDVFZ) and thrust faults. Furthermore, the fracture patterns were controlled by the structural heritage. Two major components should be considered in reservoir modeling: the deformation gradient and the proximity to the regional major faults.