Abstract:
This study presents the use of geoelectrical method in assessing the surficial aquifer potentials of
the multi-layered sedimentary basin of South Western Nigeria. The 18 Vertical Electrical Sounding (VES)
covering the sedimentary basin was conducted using the schlumberger electrode array. Methodology and data
evaluation includes zoning the basin according to their geological formations and rock types. Field resistivity
data were inverted into one and two dimensions with IPI2Win Software. The inversion were done to obtain both
lateral and vertical layer distribution of beds in the vadose zone, depth to water levels, identification of
lithological types and thicknesses and presence of aquifers. Four to six lithological layers were delineated
general for the basin from the interpretation of the data inversions. Results showed that vadose sediment
compositions include porous sandstones, limestones, shales and topsoils. Transverse conductance from the
study correlated with the aquifer transmissivity which suggest possibility of good yield. This study has shown
the importance of surface resistivity in aquifer parameters and potentials estimations.
