NDLI: Regional evaluation of hydraulic properties in variably fractured rock using a hydrostructural domain approach

Content Provider	Springer Nature Link
Author	Surrette, M. Allen, D. M. Journeay, M.
Copyright Year	2007
Abstract	A hydrostructural domain approach was tested and validated in fractured bedrock aquifers of the Gulf Islands, British Columbia (BC), Canada. Relative potential hydraulic properties for three hydrostructural domains in folded and faulted sedimentary rocks were derived using stochastically generated fracture data and hybrid discrete fracture network-equivalent porous media (DFN-EPM) modelling. Model-derived relative potential transmissivity values show good spatial agreement with transmissivity values obtained from pumping tests at selected sites. A spatial pattern of increasing transmissivity towards the southeast along the island chain is consistent between both datasets. Cluster analysis on relative potential permeability values obtained from a larger dataset for the region identified four clusters with geometric means of 9 × 10$^{−13}$, 4 × 10$^{−13}$, 2 × 10$^{–13}$, and 3 × 10$^{–14}$ m$^{2}$. The general trend is an increase in relative potential permeability toward the southeast, emulating the trends identified in the site-specific analyses. Relative potential permeability values increase with proximity to the hinge line of a regional northwest-trending asymmetric fault propagation fold structure, and with proximity to superimposed high-angle north- and northeast-trending brittle faults. The results are consistent with documented patterns of structurally controlled fluid flow and show promise for use in regional characterization of fractured bedrock aquifers.Une approche par domaine structural a été testée et validée dans des aquifères de socle fracturé des îles du Golfe en Colombie Britannique (CB) au Canada. Les propriétés hydrauliques relatives potentielles, de trois domaines structuraux dans des roches sédimentaires plissées et faillées, ont été dérivées en utilisant des données de fractures générées de façon stochastique et la modélisation hybride couplant les approches milieu poreux équivalent et réseau de fractures discrètes (DFN-EPM en anglais). Les valeurs de transmissivités relatives potentielles dérivées du modèle montrent une bonne concordance spatiale avec les valeurs de transmissivité calculées à partir d’essais de pompage pour des sites sélectionnés. Une tendance spatiale de la valeur de transmissivité à l’augmentation en direction du sud-ouest le long de la chaîne d’îles est cohérent entre les deux jeux de données. Quatre familles avec les moyennes géométriques de 9 × 10$^{–13}$, 4 × 10$^{–13}$, 2 × 10$^{–13}$, et 3 × 10$^{–14}$ m$^{2}$ ont été identifiées grâce à une analyse de regroupement sur des valeurs de perméabilité relatives potentielles issues d’un jeux de données régionales plus large. La tendance générale est une augmentation de la perméabilité relative potentielle en direction du sud-ouest, ce qui coïncide avec les tendances identifiées dans les études spécifiques au site. Les valeurs de perméabilité relatives potentielles augmentent en fonction de la distance à la charnière d’une structure en pli de propagation d’une faille asymétrique régionale à tendance nord-ouest, et en fonction de la distance à des failles cassantes superposées, à angle fort et à tendance nord/nord-ouest. Les résultats sont cohérents avec les tendances rapportées d’écoulement de fluide contrôlé par la structure et sont prometteurs pour la caractérisation régionale des aquifères de socle fracturé.Se calibró y validó un enfoque de ámbito hidroestructural en acuíferos de macizo rocoso fracturado de las Islas del Golfo, Columbia Británica (CB), Canadá. Se derivaron propiedades hidráulicas potenciales relativas para tres ámbitos hidroestructurales en rocas sedimentarias falladas y plegadas usando datos de fracturas generados estocásticamente y un modelizado de medio poroso equivalente de red de fracturas discretas híbridas (MPE-RFD). Los valores de transmisividad potenciales relativos derivados del modelo muestran buena congruencia espacial con valores de transmisividad obtenidos de pruebas de bombeo en sitios seleccionados. Un patrón espacial de transmisividad ascendente hacia el suroriente a lo largo de la cadena de islas es consistente entre ambos grupos de datos. El análisis de aglomerados de los valores de permeabilidad potencial relativa obtenidos del conjunto más grande de datos para la región identificó cuatro aglomerados con medias geométricas de 9 × 10$^{–13}$, 4 × 10$^{–13}$, 2 × 10$^{–13}$, y 3 × 10$^{–14}$ m$^{2}$. La tendencia general es un incremento permeabilidad potencial relativa hacia el sureste, emulando las tendencias identificadas en los análisis específicos para los sitios. Los valores de permeabilidad potencial relativa incrementan con la proximidad relativa a la línea de la charnela de una estructura regional con pliegues de propagación y falla asimétrica de orientación noroeste y con la cercanía a fallas frágiles superpuestas de alto ángulo de orientación nor-noreste. Los resultados son consistentes con patrones documentados de flujo de fluidos controlados estructuralmente y son prometedores para usarlos en caracterización regional de acuíferos de macizo rocoso fracturado.
Starting Page	11
Ending Page	30
Page Count	20
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	16
Issue Number	1
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-09-03
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Heterogeneity Fractured rocks Hydraulic properties Tectonics Canada 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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