INVESTIGATION OF SUBSURFACE LITHOLOGY AND AQUIFER POTENTIALS IN AKWA IBOM STATE POLYTECHNIC CAMPUS, IKOT OSURUA, AKWA IBOM STATE, NIGERIA USING ELECTRICAL RESISTIVITY METHOD
1Inyang, Udeme Udofia, 2Igboekwe, M. U. & 2Akpan, O. P*
1Department of Science TechnologyMicheal Okpara University of Agriculture, Umunike
2Department of Science Technology, Akwa Ibom State Polytechnic, Ikot Osurua
Email: apostleop5family@yahoo.com
Corresponding author*
ABSTRACT
The study was carried out to investigate the aquifer potentials and subsurface lithology in Akwa Ibom State Polytechnic Campus, Ikot Osurua, Ikot Ekpene, Akwa Ibom State. The study area lies between latitude 5o09’ and 5o40’N and longitude 7o18’ and 7o20’E, it is underlaid by sedimentary formation of late tertiary and holocence ages. A total of five (5) vertical electrical sounding (VES) were conducted using the integrated Geo-instrument 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 lithologic log to produce the geoelectric sections of the subsurface. The geoelectric section showed three (3) to four (4) layered subsurface of top soil, lateritic sand, consolidated sand, clay sand and aquifer layer with different curve types which were Q, KA, K and KK Aquifer characterization of the area showed that the aquifer resistivity with depth ranging from 89.2Ωm to 3287Ωm and 50m to 100m although it varies in some locations, this is an indication of the presence of fresh groundwater.
Keywords: Groundwater potentials, subsurface lithology, vertical electrical sounding (VES), Schlumberger configuration.
