AUTHOR: OBIEKEA GRACE CHINWENDU
DEPARTMENT: PHYSICS AND INDUSTRIAL PHYSICS
AFFILIATION: NNAMDI AZIKIWE UNIVERSITY, AWKA
A geophysical investigation involving the use of vertical electrical sounding (VES) was carried out in some towns in the Oshimili North and South Local Government Area (L.G.A.) of Delta State with a view to assessing the groundwater potential in those areas. The Schlumberger electrode configuration was adopted. Nineteen vertical electrical sounding (VES) were carried out in Asaba, Okwe, Anwai, Okpanam, Oko and Illah Communities using Slumberger array. A maximum current electrode spacing of 500m was used. VES data were processed using Schlumberger analysis package (Resist). Lithologic logs of already existing boreholes in the study area were collected, evaluated and comparisons were carried out. Results reveal alternating layers of sands, gravel, clayey sand and clay. The lithologic logs revealed that the study area is underlain by Benin Formation. The aquifer thickness ranges from 20m-80m. The results of the vertical electrical survey method obtained showed that aquifer depths at Asaba, Anwai and Okwe is within 30-35m while at Okpanam, it is 40m and at Oko and Illah, it is above 40m. The resistivity plot shows that sites in Asaba, Anwai, Oko, Okwe and Okpanam have KH, HA, KA, A, K, formation while Illah and Anwai has HK and H-type curve. The existing borehole logs in the area were used to deduce the geologic sections at the various VES points. The high correlation between the VES results and borehole log values showed that the method is suitable for underground water exploration.
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Tags: Choice Electrode Configuration, Computer Modeling., Delta State Geological Map, Groundwater Conductivity/Salinity, Groundwater Formation, Industrial Physics-Thesis-2012, Resistivity Survey Procedure, Seismic Refraction Method, vertical electrical sounding (VES)