Subsurface electrical imaging of anisotropic formations affected by a slow active reverse fault, Provence, France

Nguyen, Frédéric; Garambois, Stéphane; Chardon, Dominique; Hermitte, Daniel; Bellier, Olivier; Jongmans, Denis

doi:10.1016/j.jappgeo.2007.03.003

Cited by 63 publications

(39 citation statements)

References 38 publications

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“…The range of the coefficient of the anisotropy value is between 1.0 and 7.5 (Carmichael, 1989;Negi and Saraf, 1989). Without electrical anisotropy assumption, interpretation may be erroneous (Nguyen et al, 2007). Electrical anisotropy should be considered even when the anisotropy coefficient is (Wiese et al, 2009).…”

Section: Forward Modeling In Anisotropic Mediamentioning

confidence: 99%

Resistivity inversion of transversely isotropic media

Yas¹

2018

Turkish J Earth Sci

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IntroductionElectrical conductivity of a geological formation may vary in different directions depending on the formation's properties. This type of directional property of conductivity gives rise to electrical anisotropy (Maillet, 1947). Ignoring the electrical anisotropy of a geological formation or assuming that the formation is isotropic may yield to a misleading interpretation (Nguyen et al., 2007;Wiese et al., 2009;Greenhalgh et al., 2010).Electrical anisotropy detection in the field can be determined by using a square array, since the square array is more sensitive to electrical anisotropy in a geological formation than the most commonly used Schlumberger

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Section: Forward Modeling In Anisotropic Mediamentioning

confidence: 99%

Resistivity inversion of transversely isotropic media

Yas¹

2018

Turkish J Earth Sci

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“…It is important to remark that the resolution of this method is related to the electrode spacing (Nguyen et al, 2007). This means that any feature or anisotropy existing in the subsurface smaller than, in this case, 10 m, will not be properly represented in the ERT.…”

Section: Resistivity/structure Relationshipsmentioning

confidence: 99%

Shallow architecture of Fuegian Andes lineaments based on Electrical Resistivity Tomography (ERT). Evidences of transverse extensional faulting in the central Beagle Channel area

Tassone

Menichetti

Cerredo

et al. 2017

andgeo

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ABSTRACT. The southern foothills of the Fuegian Andes are bounded by the Beagle Channel (BC), a conspicuous E-W longitudinal basin, controlled by a large transcurrent fault system, which extends from the Atlantic to the Pacific Ocean. The northern shore of the Beagle Channel's central segment is characterized by several E-W oriented valleys, parallel to the main basin, which are interspersed with a series of oblique NW trending lineaments that extend across the mountain belt. A geoelectrical survey was carried out in order to investigate the shallow architecture of such sets of linear morphologies. The principal E-W lineament system was characterized by conspicuous sub-vertical resistivity contrasts, interpreted as fractured zones associated with fault strands of the main strike-slip Beagle Channel system, whereas the oblique NW-SE trending set of lineaments revealed slightly different resistivity patterns, with vertical displacements and less abrupt contrasts. These resistivity patterns, in combination with the widespread occurrence of normal faulting in the area, allowed to infer an extensional control over the oblique depressions. These morphological features were related to oblique transverse faults that segment two sub parallel E-W fault systems. The oblique faults were probably developed along inherited structural anisotropies and can be extended well beyond the BC shoreline to the NW. Both geophysical and field evidence suggest a post-glacial deformation along the area. RESUMEN. Arquitectura somera de lineamientos en los Andes Fueguinos basada en estudios de Tomografía de Resistividad Eléctrica (TER). Evidencias de fallamiento transverso extensional en el área central del canal deBeagle. La cordillera Fueguina está limitada al sur por el canal de Beagle, una gran fosa longitudinal que se extiende desde el océano Atlántico al este, hasta el Pacífico al oeste y está desarrollada sobre un sistema de fallamiento regional transcurrente. La costa norte del segmento central del Canal está caracterizada por la intersección de valles paralelos a la fosa principal con una serie de lineamientos morfológicos oblicuos de orientación NW-SE, los cuales se extienden a través del sistema montañoso. Se llevó a cabo un relevamiento de Tomografía de Resistividad Eléctrica con el objetivo de investigar la arquitectura somera de los diferentes juegos de lineamientos observados en el sector y dilucidar el control estructural que determina su geometría. Los resultados muestran que el sistema de lineamientos E-W está caracterizado por un patrón de resistividades con marcados contrastes de disposición subvertical interpretadas como

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“…In the electrical resistivity method, water-bearing fractured zones have high resistivity contrast with compact bedrock (Nguyen et al, 2007). In addition, there is a significant density contrast between compact rock and sinkholes in karst terrains (Martínez-Moreno et al, 2014).…”

Section: Geophysical Criteriamentioning

confidence: 99%

Prospectivity Modeling of Karstic Groundwater Using a Sequential Exploration Approach in Tepal Area, Iran

Sharifi

Arab-Amiri

Kamkar‐Rouhani

et al. 2017

Archives of Mining Sciences

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The purpose of this study is water prospectivity modeling (WPM) for recognizing karstic water-bearing zones by using analyses of geo-exploration data in Kal-Qorno valley, located in Tepal area, north of Iran. For this, a sequential exploration method applied on geo-evidential data to delineate target areas for further exploration. In this regard, two major exploration phases including regional and local scales were performed. In the first phase, indicator geological features, structures and lithological units, were used to model groundwater prospectivity as a regional scale. In this phase, for karstic WPM, fuzzy lithological and structural evidence layers were generated and combined using fuzzy operators. After generating target areas using WPM, in the second phase geophysical surveys including gravimetry and geoelectrical resistivity were carried out on the recognized high potential zones as a local scale exploration. Finally the results of geophysical analyses in the second phase were used to select suitable drilling locations to access and extract karstic groundwater in the study area. wodonośnych pochodzenia krasowego zamodelowano warstwy struktur skalnych dowodzące występowa-nia wód w oparciu o podejście logiki rozmytej. Po wytyczeniu obszarów docelowych, w drugim etapie badań przeprowadzono szczegółowe analizy geofizyczne z wykorzystanie grawimetrii i badań oporności geo-elektrycznej w strefach potencjalnego występowania wód, w aspekcie badania w skali lokalnej. W końcowym etapie, wyniki analiz geofizycznych otrzymane w drugim etapie procedury wykorzystane zostały do wyznaczenia miejsc wykonania odwiertów do uzyskania wód gruntowych pochodzenia krasowego w badanym terenie.Słowa kluczowe: modelowanie występowania wód, badanie sekwencyjne, logika rozmyta, wody gruntowe pochodzenia krasowego

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Subsurface electrical imaging of anisotropic formations affected by a slow active reverse fault, Provence, France

Cited by 63 publications

References 38 publications

Resistivity inversion of transversely isotropic media

Resistivity inversion of transversely isotropic media

Shallow architecture of Fuegian Andes lineaments based on Electrical Resistivity Tomography (ERT). Evidences of transverse extensional faulting in the central Beagle Channel area

Prospectivity Modeling of Karstic Groundwater Using a Sequential Exploration Approach in Tepal Area, Iran

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