Abstract
A dc-electrical resistivity investigation of Oke-Ila area was carried out with a view to delineating fractured zones within the crystalline basement rocks. The electrical resistivity survey involved vertical electrical soundings at twenty five locations using ABEM SAS 1000 terrameter. The results of the investigation revealed three distinct geoelectric layers: top soil, weathered layer and fractured/fresh crystalline basement rocks. Fractured zones with high aquifer potential were delineated as resistivity lows against the background resistivity highs of the fresh basement rocks. The study revealed that the fractured zones which constitute the productive water bearing zones are discontinuous (localized) and they occur at an average depth of 37.5m.
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