NDLI: Cross-borehole flow analysis to characterize fracture connections in the Melechov Granite, Bohemian-Moravian Highland, Czech Republic

Content Provider	Springer Nature Link
Author	Paillet, Frederick L. Williams, John H. Urik, Joseph Lukes, Joseph Kobr, Miroslav Mares, Stanislav
Copyright Year	2011
Abstract	Application of the cross-borehole flow method, in which short pumping cycles in one borehole are used to induce time-transient flow in another borehole, demonstrated that a simple hydraulic model can characterize the fracture connections in the bedrock mass between the two boreholes. The analysis determines the properties of fracture connections rather than those of individual fractures intersecting a single borehole; the model contains a limited number of adjustable parameters so that any correlation between measured and simulated flow test data is significant. The test was conducted in two 200-m deep boreholes spaced 21 m apart in the Melechov Granite in the Bohemian-Moravian Highland, Czech Republic. Transient flow was measured at depth stations between the identified transmissive fractures in one of the boreholes during short-term pumping and recovery periods in the other borehole. Simulated flows, based on simple model geometries, closely matched the measured flows. The relative transmissivity and storage of the inferred fracture connections were corroborated by tracer testing. The results demonstrate that it is possible to assess the properties of a fracture flow network despite being restricted to making measurements in boreholes in which a local population of discrete fractures regulates the hydraulic communication with the larger-scale aquifer system.De courts cycles de pompage sont mis en œuvre dans un forage pour induire un écoulement transitoire dans un autre forage. L’application de la méthode d’écoulement puits-à-puits démontre que les connexions par fractures entre deux forages dans le socle peuvent être caractérisées par un modèle hydraulique simple. L’analyse détermine les propriétés des connexions entre fractures plutôt que celles de fractures singulières qui recouperaient un forage unique; le modèle possède un nombre limité de paramètres ajustables ce qui fait que toute corrélation entre les données mesurées et simulées d’un test est significative. Le test a été réalisé dans deux forages profonds de 200 m espacés de 21 m dans le granite de Melechov, dans le montage de Bohême-Moravie, République Tchèque. L’écoulement transitoire a été mesuré sur sections profondes entre les fractures transmissives identifiées durant des périodes de pompage dans l’un des forages et de remontée dans l’autre. Les écoulements simulés, basés sur des modèles géométriques simples, s’ajustent étroitement aux écoulements mesurés. La transmissivité et l’emmagasinement relatifs des réseaux de fractures identifiées ont été corroborés par traçage. Les résultats démontrent qu’il est possible d’évaluer propriétés et flux d’un réseau de fractures malgré la limitation des possibilités de mesure en forages dans lesquels un réseau local de fractures discrètes régule la communication hydraulique avec le système aquifère à plus grande échelle.La aplicación del método de flujo cruzado entre pozos, en el cual se usan ciclos cortos de bombeo en un pozo para inducir un flujo transitorio en otro pozo, demostraron que un modelo hidráulico simple puede caracterizar las conexiones de las fracturas en las masas de roca de basamento entre dos pozos. El análisis determina las propiedades de las conexiones de las fracturas más que aquellas de las fracturas individuales que intersectan un solo pozo; el modelo contiene un número limitado de parámetros ajustables de modo que cualquier correlación entre datos de pruebas de flujo medido y simulado es significativa. La prueba fue realizada en dos pozos de una profundidad de 200-m separados 21 m entre sí en el Granito de Melechov en el Bohemian-Moravian Highland, República Checa. El flujo transitorio fue medido en estaciones de profundidad entre las fracturas transmisivas identificadas en uno de los pozos durante un bombeo de corto plazo y períodos de recuperación en el otro pozo. Los flujos simulados, basados en simples modelos geométricos, se aproximan cercanamente a los flujos medidos. La transmisividad relativa y el almacenamiento de las conexiones de las fracturas inferidas fueron corroboradas por pruebas de trazadores. Los resultados demuestran que es posible evaluar las propiedades de una red de flujo de fracturas a pesar de estar restringido a mediciones en pozos en que la población local de fracturas discretas regulan la comunicación hidráulica con el sistema acuífero a gran escala.井间流方法的应用表明简单的水力模型能够刻画两个井孔间岩体的裂隙连通性,该方法是利用一个井孔中的短时间抽水循环来诱发另一个井孔中的瞬时流。此分析确定了裂隙连通性的特征,而不是单个井孔断面的裂隙特征;该模型包含一定量的可调参数,所以任何测量和模拟的水流数据的相关性都是非常重要的。试验是在捷克共和国Bohemian-Moravian高原Melechov花岗岩中的两个距离21m,深度为200m的钻孔中进行的。瞬时流是在一定深度处测量的,该处位于其中一个钻孔短时间抽水时间内和另一个钻孔在恢复时间内确定的传导裂隙之间。基于简单几何模型的模拟水流与实测的水流吻合很好。相对水力传导系数和推测的连通裂隙的储水性也通过示踪试验得到证明。结果表明,尽管只能在局部范围井孔中测量受局部分散裂隙控制的与大尺度含水层系统的水力联系的水流,评价裂隙流网的特征也是可能的。A aplicação do método de fluxo cruzado entre furos, em que são usados ciclos curtos de bombagem num furo para induzir um escoamento transiente noutro furo, demonstrou que um modelo hidráulico simples pode caracterizar as conexões entre fracturas do maciço rochoso entre dois furos. Mais do que as propriedades das fracturas individuais que intersectam um único furo, a análise calcula as propriedades das conexões entre fracturas; o modelo contém um número limitado de parâmetros ajustáveis, de modo que qualquer correlação entre os dados medidos e simulados do teste de fluxo é significativa. O teste foi realizado em dois furos com 200 m de profundidade, espaçados 21 m, no Granito de Melechov, nas Terras Altas da Boémia-Morávia, República Checa. O fluxo transiente foi medido num dos furos em estações de profundidade entre as fracturas identificadas como transmissivas durante curtos períodos de bombagem e recuperação no outro furo. Os fluxos simulados, com base em geometrias simples do modelo, condizem bem com os fluxos medidos. A transmissividade relativa e o armazenamento das conexões de fractura inferidas foram corroborados por ensaios de traçadores. Os resultados demonstram que é possível avaliar as propriedades de uma rede de fluxo de fractura, apesar de se limitar a medições em poços em que uma população local de fracturas discretas regula a comunicação com o sistema hidráulico do aquífero de maior escala.
Starting Page	143
Ending Page	154
Page Count	12
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	20
Issue Number	1
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2011-10-02
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fractured rocks Hydraulic testing Flowmeter logging Czech Republic Geology Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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