Geoelectrical Survey for the Exploration of Ground Water using Vertical Electrical Sounding: A Case Study of Androt District Rawlakot, Azad Jammu & Kashmir

• Main Authors: Mehboobur Rashid, Sohail Anwar, Syed Ali Abbas, Waqas Ahmad
• Format: Article
• Language: English
• Published: Society of Economic Geologists and Mineral Technologists 2018-09-01
• Series: International Journal of Economic and Environment Geology
• Subjects: Vertical electrical sounding; ground water; resistivity; IPI2win.
• Online Access: http://econ-environ-geol.org/old-website/pdf/sep2017/4.pdf

Vertical Electrical Sounding (VES) method has been widely used todepict the subsurface lithology, thickness and structure based on resistivity of layered media with the ultimate objective of evaluating groundwater potential. In this investigation, VES was used to outline subsurface geology to produce a 2D subsurface resistivity model based on the resistivity contrast of layered rocks, for evaluating the accessibility of groundwater in the Siwaliks group of Androt District Rawlakot, Azad Jammu and Kashmir (AJ&K). The Schlumberger electrode configuration was used with spacing arrangement of current electrode (AB/2) going from 1.5 to 250 meters and potential electrode (MN)1 to 50 meters. The VES data wasqualitatively analyzed by using iteration software (IPI2win) which showed that the area is composed ofclay, shale, fractured sandstone with intercalation of clay based on resistivity contrast. At depth of 40m-100m along VES indicates good prospects for ground water potential, associated with sandstone beds of Siwaliks group. The resistivitydepth section maps at potential depthof 30m, 40m, 60m and 80m are prepared for the demarcation of potential reservoir beds at various depth. The interpreted sounding curves are interpreted qualitatively and pseudo section, Resistivity section and geological log are prepared based on resistivity contrast which shows agreement with geology and hydrological condition of the area. The favorable reservoir rock as an aquifer demarcated in the study area isfractured sandstone with intercalation of clay beds, with apparent resistivity rangeof80Ωm to 100Ωm and thickness of 20m to 50m at different sites. The apparent resistivity sections revealed that the North East (NE) and North West (NW) regions are comparatively good potential reservoir for ground water.