GEO-ELECTRICAL EXPLORATION FOR GROUND-WATER IN GBATAKO, EDU L.G.A. , KWARA STATE, NIGERIA.
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Date
2013
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Faculty of Science, University of Ilorin, Nigeria.
Abstract
Schlumberger Vertical Electrical Soundings (VES) for groundwater exploration in Gbatako, Edu Local Government Area (L.G.A.) of Kwara State, was carried out with a view to establishing the different subsurface geoelectric layers, the aquifer units and their hydrogeologic properties. Data were collected from 5 VES stations. From the quantitative interpretation of the data collected, using the usual method of curve matching with the Orellana-Mooney Master curves and 1-D forward modeling with WinResist 1.0 version software, four lithologic units were identified. The resistivity data interpretation has revealed three lobes of low resistivities which constitute the prospective zones for water in the area to exist below station 1 at depth 5.5 to 19.7m (with resistivity 101.7 ohm-m), station 2 at depth 8.6 to 19.4m (with resistivity 144 ohm-m) and station 4 at depth 11.8 – 25.2m (with resistivity 83.5 ohm-m) . The study concluded that the best location in the study area to site a borehole is station number 1 as it contains a major lobe of low resistivity which could be explored for water supply.
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Keywords
Geophysical, Aquifer, Lobe, Resistivity, Lithology, Geoelectric