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Groundwater investigation through vertical electrical sounding at hilly area from Nooriabad toward Karachi

Soomro Asadullah, Qureshi Abdul Latif, Jamali Muhammad Afzal, Ashraf Arshad

Acta Geophysica

2019

Vol. 67, no. 1

247--261

The study is conducted to focus on the subsurface geological and hydrological mapping for groundwater presence in the area located Nooriabad of the Jamshoro district left side of M-9 Motorway toward Karachi, Sindh, Pakistan. Vertical electrical sounding (VES) is carried out by using the Schlumberger electrode array method with ranging from 02 to 300 m. IPI2win software is used on the collected data of VES to interpret with qualitatively that indicated the four distinct lithological units demarcated as clay, sandy clay, shale and alluvium or weathered layer of Tiyon formation and limestone and fractured sandstone beds of the Laki formation of Eocene age. On the collected VES data, it is concluded that the first and second layer of soil is 16 m thick and composed of shale to clay beds and alluvium having the apparent resistivity between 05 and 15 Ωm. With increasing depth from 50 to 100 m, it is interpreted that there are fractured sandstone and limestone beds with average resistivity ranges between 15 to 60 Ωm. Further, processed the data and generated pseudo-section, apparent resistivity section and statistical curve by using software IPI2win to interpret the apparent resistivity map at 50, 60, 70 and 80 m are correlated with the hydrogeology and geology of the area. The results are interpreted that the good aquifer zones are present in the 50–100-m-thick limestone and fractured sandstone beds having interconnection with clay. Accumulation of groundwater is found by controlling the physiography and geological structure of the study area.