Groundwater Potential Detection Possibility in Southern Ondo State, Nigeria

Abstract

A new simple and quick geophysical method for groundwater exploration of the coastal plains sands and alluvial deposits of parts of Ondo State, Nigeria has been developed. A geophysical evaluation using Electrical Resistivity method for groundwater exploration at the study area was carried out which involved the utilization of Vertical Electrical Sounding (VES) technique with schlumberger array system. About eight (8) points of vertical electrical sounding (VES) survey using ABEM tetrameter (SAS 300) was tabulated in a table which shows the resistivity, the thicknesses and the number of layers for each VES station. The field results were plotted, the curve types and lithologic layers were revealed. The plots showed type-Q, type-K, type-A and type-H curve merging while VES-3 did not reveal any type of curve. This was because of that point understudy being homogenously deposited and non-horizontally layered. Some of the VES points have horizontal layers not more than two for example, VES-1 and VES-3 whiles others have a maximum of four layers within them. The resistivity of the basement within the area ranges from 163.1 ohm-m to 9113.4 ohm-m with an average resistivity of 2627.76 ohm-m. In terms of geological structures and aquifer potential, VES-7 and VES-8 showed to possess characteristically a good geological structures and aquifers for groundwater potentials.