Exploring deep potential aquifer in water scarce crystalline rocks

Abstract

Characterization of the shear zone with pole-pole electrical resistivity tomography (ERT) was carried out to explore deep groundwater potential zone in a water scarce granitic area. As existing field conditions does not always allow to plant the remote electrodes at sufficiently far of distance, the effect of insufficient distance of remote electrodes on apparent resistivity measurement was studied and shown that the transverse pole-pole array affects less compared to the collinear pole-pole array. Correction factor have been computed for transverse pole-pole array for various positions of the remote electrodes. The above results helped in exploring deep aquifer site, where a 270 m deep well was drilled. Temporal hydro-chemical samples collected during the pumping indicated the hydraulic connectivity between the demarcated groundwater potential fractures. Incorporating all the information derived from different investigations, a subsurface model was synthetically simulated and generated 2D electrical resistivity response for different arrays and compared with the field responses to further validate the geoelectrical response of deep aquifer setup associated with lineament.

The electrical resistivity method

“…Seaton and Burbey (2002) advocate dipole-dipole configuration for fractured zone detection. Chandra et al (2012), after corroborating modeling and borehole results opine that PP electrode configuration can be used for delineating deeper fractured zones. Chandra et al (2012), after corroborating modeling and borehole results opine that PP electrode configuration can be used for delineating deeper fractured zones.…”

Groundwater quality with special reference to fluoride concentration in the granitic and basaltic contact zone of southern India

“…Descriptive statistics of the measured water quality parameters of the collected samples were presented in Table 1 [ 6 , 7 ]. The spatial and temporal distribution of fluoride in the watershed is presented in Fig.…”

Structural control of weathering processes within exhumed granitoids: Compartmentalisation of geophysical properties by faults and fractures

“…In other cases, fault zones or fractured corridors can be preferentially weathered to such an extent that they may present favourable reservoir properties such as HRA e Hard Rock Aquifers (Gustafson and Krasn! ý, 1994;Taylor and Howard, 2000;Wyns et al, 2004;Dewandel et al, 2006;Lachassagne et al, 2011;Chandra et al, 2013;Leray et al, 2013;Guiheneuf et al, 2014! ).…”