Adewoye, AOBayewu, OOFolorunso, IO2023-01-052023-01-052021https://uilspace.unilorin.edu.ng/handle/20.500.12484/8128Potable groundwater is a rare resource in some part of Okeiho southwestern Nigeria, assessing and delineating its feasible zones of high potential using non-invasive geoelectric investigation is really vital so as to monitor the successful exploration of the underground water. The study area is underlain predominantly with coarse porphyritic granite and syenite including pyrozene diorite. Thirty six (36) Vertical electrical soundings (VES) were surveyed around built up areas using ABEM SAS 1000 Terrameter with potential and current electrode spacing varied from 0.5 to 15mand 1 to 160 m respectively with VES curves interpreted qualitatively and quantitatively using curve matching techniques. Geoelectrical properties such as weathered resistivity layer, Overburden thickness, weathered thickness layer, bedrock relief, basement resistivity, reflection coefficient and the Dar-Zarrouk parameters were determined from each VES point and contoured so as to distinguish the groundwater prospects within the studied area. Typical curves corresponding to VES data include A’ ,‘H’, ‘HKH’ and ‘KH’. The most prevalent curve –type is H-type, comprising of 67% curves observed while the ‘A’, ‘KH’ and ‘HKH’ types establish 22%, 8.3% and 2.7% .The thickness of the overburden ranges between 2.8 – 16.8 m ;the weathered layer thickness range from 1.4 – 14.1 m ; the basement resistivity ranges from 357 – 14760 Ωm; the longitudinal conductance ranges from 0.022 – 0.39 Ω-1 ,;the transverse resistance has values ranges from 53 – 4760 Ωm2 , and the electrical anisotropy has values ranges from 1 to 1.8.The northern, eastern and central portion is described by decrease in overburden thickness , weathered resistivity layer , total longitudinal conductance, indicating low aquifer potential, transverse resistance unit, total longitudinal conductance unit , and electric anisotropy values increases towards the southwestern part , reflecting moderate aquifer prospects. In such manner, the southwestern part of the studied portions are categorized as moderate groundwater prospects; while the northern and eastern part are categorized as area with poor groundwater prospectenCrystalline Basement, Resistivity, Dar-Zarrouk Parameters, Aquifer PotentialArticle