Geophysical investigation of groundwater resources integrating seismic refraction tomography and resistivity data in Ibadan West, Nigeria

Abass, Olusegun K. and Bello, Musa Geophysical investigation of groundwater resources integrating seismic refraction tomography and resistivity data in Ibadan West, Nigeria. International Conference on Engineering Geophysics.

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Abstract

Secondary porosity formed within hard rock formations as a result of weathering, jointing, faulting or fracturing constitutes areas of special interest in groundwater prospecting. In this study, integrated electrical resistivity and seismic refraction surveys were carried out within the subsurface strata of Ibadan West, Nigeria, to delineate the groundwater potential and aquifer characteristics of the area. The integrated interpreted results revealed four layers overlying the resistive basement: the topsoil, dry sand, saturated sand and the weathered basement. The investigation also revealed the presence of a potential aquifer in the area, with resistivity values of 95 – 295 Ωm, and velocities range of 1650 – 2800 m/s while the depth of the aquifer ranged between 2.8 and 10.4 m. The forth lithological unit which has velocities ranging from 2500 – 3500 m/s and a resistivity value of 1124 – 1946 Ωm is considered the weathered basement. Comparing lithological logs from drilled boreholes with acquired geophysical data, the study area is considered suitable for groundwater development via shallow borehole construction.

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