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首页> 外文期刊>Journal of Hydrology >Hydrological behavior of a deep sub-vertical fault in crystalline basement and relationships with surrounding reservoirs
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Hydrological behavior of a deep sub-vertical fault in crystalline basement and relationships with surrounding reservoirs

机译：晶体基底深垂直断裂的水文行为及其与周围储层的关系

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Crystalline-rock aquifers generally yield limited groundwater resources. However, some highly productive aquifers may be encountered, typically near tectonic discontinuities. In this study, we used a multidisciplinary experimental field approach to investigate the hydrogeological behavior of a sub-vertical permeable fault zone identified by lineament mapping. We particularly focused our investigations on the hydrogeological interactions with neighboring reservoirs. The geometry of the permeable domains was identified from geological information and hydraulic test interpretations. The system was characterized under natural conditions and during a 9-week large-scale pumping test. We used a combination of piezometric analysis, flow logs, groundwater dating and tracer tests to describe the interactions between permeable domains and the general hydrodynamical behaviors. A clear vertical compartmentalization and a strong spatial heterogeneity of permeability are highlighted. Under ambient conditions, the vertical permeable fault zone allows discharge of deep groundwater flows within the superficial permeable domain. The estimated flow across the total length of the fault zone ranged from 170 to 200 m3/day. Under pumping conditions, hydrological data and groundwater dating clearly indicated a flow inversion. The fault zone appears to be highly dependent on the surrounding reservoirs which mainly ensure its recharge. Groundwater fluxes were estimated from tracer tests interpretation. This study demonstrates the hydrogeological capacities of a sub-vertical fault aquifer in a crystalline context. By describing the hydrological behavior of a fault zone, this study provides important constrain about groundwater management and protection of such resources
机译：结晶岩含水层通常产生有限的地下水资源。但是，可能会遇到一些高产含水层，通常在构造不连续附近。在这项研究中，我们使用了多学科的实验场方法来研究由线状图确定的亚垂直渗透断层带的水文地质行为。我们特别将研究重点放在与邻近储层的水文地质相互作用上。从地质信息和水力试验解释确定了可渗透区域的几何形状。该系统在自然条件下进行了为期9周的大规模抽水测试。我们结合了测压分析，流量测井，地下水测年和示踪剂测试，以描述渗透性区域与一般水动力行为之间的相互作用。突出显示了清晰的垂直分隔和强烈的渗透性空间异质性。在环境条件下，垂直渗透断层带允许在浅层渗透域内排放深层地下水。断层带总长度的估计流量为每天170至200立方米。在抽水条件下，水文数据和地下水测年清楚地表明了流量反演。断层带似乎高度依赖周围的储层，主要保证了其补给。地下水通量由示踪剂测试解释估算。这项研究表明了在结晶环境下亚垂直断层含水层的水文地质能力。通过描述断层带的水文行为，本研究为地下水管理和此类资源的保护提供了重要的约束。

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