NDLI: Understanding the effect of single-fracture heterogeneity from single-well injection-withdrawal (SWIW) tests

Content Provider	Springer Nature Link
Author	Larsson, Martin Doughty, Christine Tsang, Chin Fu Niemi, Auli
Copyright Year	2013
Abstract	The single-well injection-withdrawal (SWIW) tracer test is a method used to estimate the tracer retardation properties of a fracture or fracture zone. The effects of single-fracture aperture heterogeneity on SWIW-test tracer breakthrough curves are examined by numerical modelling. The effects of the matrix diffusion and sorption are accounted for by using a particle tracking method through the addition of a time delay added to the advective transport time. For a given diffusion and sorption property (P $_{m}$) value and for a heterogeneous fracture, the peak concentration is larger compared to a homogeneous fracture. The cumulative breakthrough curve for a heterogeneous fracture is similar to that for a homogeneous fracture and a less sorptive/diffusive tracer. It is demonstrated that the fracture area that meets the flowing water, the specific flow-wetted surface (sFWS) of the fracture, can be determined by matching the observed breakthrough curve for a heterogeneous fracture to that for a homogeneous fracture with an equivalent property parameter. SWIW tests are also simulated with a regional pressure gradient present. The results point to the possibility of distinguishing the effect of the regional pressure gradient from that of diffusion through the use of multiple tracers with different P $_{m}$ values.Le test de traçage par injection-pompage en puits unique est une méthode utilisée pour estimer le retard d’un traceur, caractéristique d’une fracture ou d’une zone de fractures. Les effets de l’hétérogénéité liée à une fracture ouverte isolée sur les courbes de réponse du traceur, dans le test de d’injection-pompage en puits unique, sont étudiés par modélisation numérique. Les effets de la diffusion matricielle et de la sorption sont pris en compte en utilisant une méthode de traçage de la particule passant par l’addition d’un temps de retard et du temps de transfert advectif. Pour une valeur donnée (P $_{m}$) du paramètre de diffusion et de sorption, le pic de concentration est plus marqué pour une fracture irrégulière que pour une fracture régulière. La courbe de réponse cumulative du signal pour une fracture irrégulière est la même que pour une fracture régulière et un traceur moins sorbé et moins diffusé. On démontre que la surface de fractures en contact avec l’eau libre ou surface mouillée spécifique de la fracture, peut être déterminée par ajustement des courbes de réponse du signal observées pour une fracture irrégulière et une fracture régulière de propriétés paramétrées équivalentes. Les tests d’injection-pompage en puits unique sont également simulés avec le gradient de pression régional. Les résultats soulignent la possibilité de distinguer l’effet du gradient de pression régional de l’effet de la diffusion, grâce à l’utilisation de traceurs multiples à valeurs (P $_{m}$) différentes.Una prueba de trazador en un pozo único de extracción e inyección (SWIW) es un método usado para estimar las propiedades del retardo de un trazador de una fractura o zona de fractura. Los efectos de la heterogeneidad de la apertura de una fractura única sobre las curvas de ruptura de las pruebas de trazador SWIW se examinan por modelación numérica. Los efectos de la matriz de difusión y sorción son considerados mediante el uso del método de seguimiento de partículas a través de la adición de un tiempo de retardo añadido al tiempo de transporte advectivo. Para un valor dado de la propiedad de difusión y sorción (P $_{m}$) y para una fractura heterogénea, el pico de la concentración es mayor en comparación con una fractura homogénea. La curva acumulativa de ruptura para una fractura heterogénea es similar a la de una fractura homogénea y un trazador menos difusivo/sortivo. Se demuestra que en el área de fractura que se encuentra con el agua que fluye, el flujo de la superficie específica mojada de la fractura (sFWS), puede determinarse comparando la curva observada de ruptura para una fractura heterogénea con respecto a una fractura homogénea con un parámetro de propiedad equivalente. Las pruebas SWIW también se simulan con un gradiente de presión regional presente. Los resultados apuntan a la posibilidad de distinguir el efecto del gradiente de presión regional de la difusión a través del uso de trazadores múltiples con diferentes valores de P $_{m}$.单井回灌-抽水 (SWIW) 示踪试验是一种确定裂隙或裂隙带中滞留示踪特性的方法。在SWIW试验中单裂隙非均质缝隙沿曲线踪迹由数值模型模拟。这类网状扩散和吸附作用采用质点示踪方法通过延时增加对流传导时间来说明。对于给定的扩散和吸附特征值(P $_{m}$)和非均质裂隙,浓度峰值要比均质裂隙大。穿透曲线在非均质裂隙中与均质裂隙类似,并且较少吸附/扩散。这显示出在裂隙地区遇到水流,裂隙表面被水流湿润(sFWS),可以由非均质裂隙中观测穿透曲线确定,而在均质裂隙中则由特征参数确定。SWIW试验还用于模拟区域压力梯度。通过用不同的P $_{m}$值的多种示踪,其结果指出各种可能有关由扩散产生的区域压力梯度作用的差别。O ensaio de traçador em furo único de injeção e extração (SWIW – single-well injection-withdrawal) é um método usado para estimar as propriedades de retardamento do traçador numa fratura ou zona fraturada. Os efeitos da heterogeneidade da abertura de uma fratura única nas curvas de variação da concentração do traçador ao longo do tempo dos ensaios de injeção e extração em furo único são examinados por modelação numérica. Os efeitos da difusão e sorção da matriz são contabilizados mediante o uso de um método de rastreamento de partículas, através da adição de um atraso ao tempo de transporte advectivo. Para um dado valor das propriedades de difusão e sorção (P $_{m}$) e para uma fratura heterogénea, o pico da concentração é maior quando comparado com o de uma fratura homogénea. A curva cumulativa de variação da concentração ao longo do tempo para uma fratura heterogénea é semelhante à duma fratura homogénea e um traçador menos sortivo/difusivo. Demostra-se que a área de fratura que contacta com o fluxo de água, a superfície de fluxo húmida específica da fratura, pode ser determinada combinando a curva de variação da concentração ao longo do tempo observada para uma fratura heterogénea com a duma fratura homogénea com um parâmetro de propriedade equivalente. Os testes SWIW são também simulados na presença de um gradiente de pressão regional. Os resultados apontam para a possibilidade de distinguir o efeito do gradiente de pressão regional do efeito da difusão através do uso de múltiplos traçadores com diferentes valores de P $_{m}$.
Starting Page	1691
Ending Page	1700
Page Count	10
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	21
Issue Number	8
e-ISSN	14350157
Language	Portuguese
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-05-07
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater flow Tracer tests Solute transport Fractured rocks Numerical modeling Hydrogeology Hydrology/Water Resources Geology Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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