Geoelectric Investigation Of The Subsurface Characterization And Groundwater Status In Ikot Osurua Community, Akwa Ibom State, Nigeria
Okon Peter, Udeme Inyang & Itoro Sampson
Akwa Ibom State Polytechnic,
Ikot Osurua, Akwa Ibom State
Email: apostleop5family@yahoo.com
ABSTRACT
The study was carried out to investigate the subsurface layer parameters in Ikot Osurua, Akwa Ibom State with a view to determining the aquifer configurations which will assist in sitting high yield boreholes in the
community. A total of five (5) vertical electrical sounding (VES) were conducted using the integrated Geoinstrument service (IGIS) resistivity meter to generate the field data. The Schlumberger sounding was carried
out with current electrode spacing (AB) ranging from 1-300m. The distance used for the potential electrode spacing (MN) ranging from 0.25-10m. This array was employed in view of it resolution power and its reliability. The field data obtained were subjected to interpretation by partial curve matching and by computer iteration using IP12 WIN software. The interpreted results were constrained by lithological log to produce the geoelectric sections of the subsurface. The geoelectric section showed three (3) to five (5) layered subsurface of top soil, lateritic sand, consolidated sand, clay sand and aquifer layer with different curve types which were
Q, KH, and K. Aquifer characterization of the area showed that the aquifer resistivity with depth ranging from 89.2Ωm to 3287Ωm and 40m to 80m although it varies in some locations, this is an indication of the presence of fresh groundwater. Appropriate depths to which portable water can be obtained from the various locations are recommended in this study.
Keywords: Groundwater potentials, subsurface lithology, vertical electrical sounding (VES), Schlumberger configuration.
