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首页> 外文期刊>Journal of Contaminant Hydrology >Probabilistic study of well capture zones distribution at the Lauswiesen field site
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Probabilistic study of well capture zones distribution at the Lauswiesen field site

机译：洛斯维森油田现场采油区分布的概率研究

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摘要

The delineation of well capture zones is of utmost environmental and engineering relevance as pumping wells are commonly used both for drinking water supply needs, where protection zones have to be defined, and for investigation and remediation of contaminated aquifers. We analyze the probabilistic nature of well capture zones within the well field located at the "Lauswiesen" experimental site. The test site is part of an alluvial heterogeneous aquifer located in the Neckar river valley, close to the city of Tuebingen in South-West Germany. We explore the effect of different conceptual models of the structure of aquifer heterogeneities on the delineation of three-dimensional probabilistic well catchment and time-related capture zones, in the presence of migration of conservative solutes. The aquifer is modeled as a three-dimensional, doubly stochastic composite medium, where distributions of geo-materials and hydraulic properties are uncertain. We study the relative importance of uncertain facies geometry and uncertain hydraulic conductivity and porosity on predictions of catchment and solute time of travel to the pumping well by focusing on cases in which (1) the facies distribution is random, but the hydraulic properties of each material are fixed, and (2) both facies geometry and material properties vary stochastically. The problem is tackled within a conditional numerical Monte Carlo framework. Results are provided in terms of probabilistic demarcations of the three-dimensional well catchment and time-related capture zones. Our findings suggest that the uncertainty associated with the prediction of the location of the outer boundary of well catchment at the "Lauswiesen" site is significantly affected by the conceptual model adopted to incorporate the heterogeneous nature of the aquifer domain in a predictive framework. Taking into account randomness of both lithofacies distribution and materials hydraulic conductivity allows recognizing the existence of preferential flow paths that influence the extent of the well catchment and the solute travel time distribution at the site.
机译：井口捕获区的划分对环境和工程具有最大的意义，因为抽水井通常用于饮用水供应需求（需要定义保护区）以及调查和修复受污染的含水层。我们分析了位于“ Lauswiesen”实验点的井场内的井捕获区的概率性质。测试地点是位于内卡河河谷的冲积非均质含水层的一部分，靠近德国西南部的图宾根市。在存在保守溶质迁移的情况下，我们探索了含水层非均质性结构的不同概念模型对三维概率井集水区和与时间相关的捕获区的划定的影响。含水层被建模为三维，双重随机复合介质，在这种介质中，地质材料的分布和水力特性是不确定的。通过关注以下情况（1）相分布是随机的，但每种材料的水力特性，我们研究了不确定相的几何形状以及不确定的水力传导率和孔隙度对预测集水率和到达抽油井的溶质时间的相对重要性。是固定的；（2）相的几何形状和材料属性都是随机变化的。该问题在条件数值蒙特卡洛框架内解决。根据三维井集水区和时间相关捕获区的概率划分提供了结果。我们的发现表明，与“ Lauswiesen”站点的集水区外部边界的位置预测有关的不确定性受到在预测框架中纳入含水层域异质性的概念模型的影响。考虑岩相分布和材料的水力传导率的随机性，可以认识到存在优先流动路径，这些流动路径会影响井的集水程度和现场的溶质运移时间分布。

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