Geophysical signatures resolving hydrogeological complexities over hard rock terrain—a study from Southern India

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• 作者：Sahebrao Sonkamble (1)
  Subash Chandra (1)
  E. Nagaiah (1)
  Farooq A. Dar (1)
  V. K. Somvanshi (1)
  Shakeel Ahmed (1)
  
• 关键词：Hydrogeological complexities ; Geophysical parameters ; Groundwater potential ; Borehole drilling ; Hyderabad ; India
• 刊名：Arabian Journal of Geosciences
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：7
• 期：6
• 页码：2249-2256
• 全文大小：
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• 作者单位：Sahebrao Sonkamble (1)
  Subash Chandra (1)
  E. Nagaiah (1)
  Farooq A. Dar (1)
  V. K. Somvanshi (1)
  Shakeel Ahmed (1)
  
  1. Indo-French Centre for Groundwater Research, CSIR—National Geophysical Research Institute, Hyderabad, 500 007, India
  
• ISSN：1866-7538

文摘

A series of geophysical parameters have been applied with geological perception to resolve the hydrogeological complexities over granitic terrain at Hyderabad, India. Frequent failure of borehole drillings and the thrust conditions of community have prompted a noninvasive suitable tool, applied at small scale for pinpointing potential well site. Geophysical scanning, viz. electrical resistivity tomography (ERT), spontaneous potential (SP), and electrical gradient profiling (GP) were employed within the restricted space of housing complex to obtain the true characteristics of the subsurface lithology, where anomalies by the underground utility structures have been nullified. Results showed, in ERT, the low order of resistivity range 123 to 200?Ωm showing a plume like weathered zone underlain by sudden slip of massive granite (>217?Ωm) was of great interest to proceed further in the process. Here, the switchover in SP value from +18?mV to ?7?mV and GP from mean value 10 to 90?mV/m was recorded. The anomalies in SP and GP were precisely coincided with the ERT where upcoming of subsurface massive granite next to the inferred fracture was noted. Drilling core logs satisfies the geophysical signatures ensuring the inferred saturated fracture with the total yield 1,302?gal/h.