NDLI: Electrical resistivity imaging of conductive plume dilution in fractured rock

Content Provider	Springer Nature Link
Author	Nimmer, Robin E. Osiensky, James L. Binley, Andrew M. Sprenke, Kenneth F. Williams, Barbara C.
Copyright Year	2007
Abstract	Electrical resistance tomography (ERT) was used to monitor a conductive plume dilution experiment that was conducted in fractured basalt in order to assess its applications in this type of fractured-rock environment. Tap water was injected into an injection well for 34 days to dilute a pre-existing potassium chloride (KCl) plume at a site in Idaho, USA. No further fluids were introduced artificially during a 62-day monitoring period. Both surface ERT and cross-borehole ERT were used to monitor dilution and displacement of the plume. A square grid of land-surface electrodes was used with the surface ERT. Three-dimensional images of surface ERT delineated areas of increased and decreased resistivities. Increasing resistivities are attributed to dilution/displacement of the KCl solution by tap-water invasion or the influx of seasonal recharge. Decreasing resistivities resulted from redistribution of residual KCl solution. Cross-borehole ERT was conducted between the injection well and each of seven surrounding monitoring wells. Polar plots of the injection-well resistivity data in the direction of each monitoring well delineate specific locations where tap water seeped from the injection well via preferential flow paths determined by time-dependent resistivity increases. Monitoring-well data indicate locations of clustered and isolated regions of resistivity changes.La tomographie de résistivité électrique (ERT en anglais) a été utilisée pour surveiller une expérience de dilution d’un panache conducteur dans du basalte fracturé, afin d’évaluer son application dans ce type d’environnement à roches fracturées. De l’eau du réseau d’alimentation a été injectée dans un puits d’injection pendant 34 jours pour diluer un panache de chlorure de potassium (KCl) préexistant sur un site localisé dans l’Idaho aux Etats-Unis. Aucun autre fluide n’a été artificiellement introduit pendant une période de surveillance de 62 jours. L’ERT de surface et l’ERT entre puits ont toutes deux été utilisées pour contrôler la dilution et le déplacement du panache. Un maillage carré d’électrodes de surface a été utilisé pour l’ERT de surface. Des images tridimensionnelles obtenues par l’ERT de surface ont délimité des zones d’augmentation et de diminution de la résistivité. Les résistivités croissantes sont expliquées par la dilution/déplacement du KCl causés par l’invasion de l’eau du réseau ou par l’arrivée de la recharge saisonnière. Les résistivités décroissantes provenaient de la redistribution de la solution de KCl résiduelle. L’ERT de puits a été effectuée entre le puits d’injection et chacun des sept puits d’observation environnants. Des graphiques polaires des données de résistivité du puits d’injection avec la direction de chaque puits de surveillance, délimitent des zones spécifiques d’infiltration de l’eau du réseau à partir du puits d’injection via des trajectoires d’écoulement préférentiel déterminées par les augmentations de la résistivité dans le temps. Les données des puits de surveillance indiquent l’emplacement des zones amassées et isolées de variation de résistivité.La tomografía de resistencia eléctrica (TRE) fue usada para supervisar un experimento de dilución de una pluma conductiva, que se realizó en un basalto fracturado, para evaluar sus aplicaciones en este tipo de ambiente de roca fracturada. Se inyectó agua del grifo dentro de un pozo de inyección durante 34 días, para diluir una pluma pre-existente de cloruro de potasio (KCl), en un sitio en Idaho, E.U.A. Ningún fluido adicional se introdujo artificialmente durante un período de monitoreo de 62 días. Tanto la TRE superficial, como la TRE de registro cruzado de pozo, fueron usadas para supervisar la dilución y desplazamiento de la pluma. Una malla cuadrada de electrodos de superficie se usó con la TRE superficial. Las imágenes tridimensionales de la TRE superficial delinearon las áreas de aumento y disminución de la resistividad. Se atribuyen las resistividades crecientes a la dilución/desplazamiento de la solución de KCl, por invasión del agua de grifo o por la entrada de recarga estacional. Las resistividades decrecientes fueron el resultado de la redistribución de solución de KCl residual. La TRE de registro cruzado de pozo fue ejecutada entre el pozo de inyección y cada uno de siete pozos de monitoreo circundantes. Las gráficas polare, de los datos del resistividad del pozo de inyección, en la dirección de cada uno de los pozos de monitoreo, delinean situaciones específicas dónde el agua de grifo se infiltra desde el pozo de inyección, siguiendo caminos de flujo preferenciales, determinados por los aumentos de la resistividad dependientes del tiempo. Los datos de los pozos de monitoreo indican sectores de cambios del resistividad en forma de racimo y regiones aisladas.
Starting Page	877
Ending Page	890
Page Count	14
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	15
Issue Number	5
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-01-30
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fractured rocks Basalt Tracer tests Electrical resistance tomography Plume Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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