A comprehensive geophysical and petrological study was carried out at Giddalur area in Prakasam district, Andhra Pradesh, which is geologically a highly deformed area and is difficult to delineate the aquifer zone(s). The task was to find out the exact rock type in which aquifer is concealed as well as to delineate the aquifer zone, which can yield sufficient quantity of water. The resistivity models derived from geophysical dataset were interpreted in terms of hydrogeology and the results revealed substantial resistivity contrast of the geological formations within the study area. We have delineated two major groundwater potential zones based on this study. These zones were tapped at different depths in diverse rock types. Drilled hand specimens (rock cuttings) were not adequate, so these specimens were petrographically studied to reveal the exact contact zones of the rock type. On integration of the geophysical and the petrographic results, it was illustrated that two aquifer zones were struck at a depth of 92 and 122 m between shale-phyllite and phyllite-quartzite, respectively. These findings were correlated, which matched with the lithology of the drilled borehole. This integrated approach will be helpful in strategy for groundwater assessment as well as prospecting groundwater resources in different geological terrain.
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The authors are thankful to Dr V M Tiwari, Director CSIR–National Geophysical Research Institute, Hyderabad, India for his encouragement, support for the CSIR-800 activity and kind permission for carrying out this important research work for the societal benefit. We are grateful to Mr Arun Kumar and C Vinod for their help in geophysical field work as well as technician Mohan Reddy and Khwaja Moinuddin for their unconditional help and support during the fieldwork. Authors are thankful to the anonymous reviewer for his constructive and valuable comments, which improve the quality of this paper.
Communicated by Munukutla Radhakrishna
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Warsi, T., Kumar, V.S., Kumar, D. et al. Integration of geophysics and petrography for identifying the aquifer and the rock type: A case study from Giddalur, Andhra Pradesh, India. J Earth Syst Sci 129, 44 (2020). https://doi.org/10.1007/s12040-019-1321-4
- Geophysical methods
- groundwater exploration