Volume 59, Issue 327, March 2023

Delineation of subsurface lithology and aquifers in Kajola Town, Ondo State using geoelectrical resistivity techniques

Onifade Yemi Sikiru, Olaseni Victor Babasola, Chukwusa Francis Onyemachi

Department of Physics, College of Science, Federal University of Petroleum Resources, Effurun, Nigeria

ABSTRACT

Assessment of groundwater yielding region using geophysical investigation was carried out to identify possible potential aquifer using Vertical Electrical Sounding (VES) method and 2-Dimensional method in Kajola town, Ondo State. The Schlumberger array configuration was used for acquiring data for VES and Wenner array for 2-D methods. Seven (7) Vertical Electrical Soundings and Ten (10) 2-D images were obtained. VES data acquired from the study area were processed using iteration software WINRESIST. Also, the 2-D data acquired were analysed, processed and inverted using a software called RES2DINV to obtain the 2-D resistivity structure. Varying anomalous features along each profile were delineated from the distribution of areas of high, low and moderate resistivity. The model also exhibits gradational change in resistivity with depth, and with varying subsurface topographies. VES results clearly indicate that the depth of the aquifers are 8.9m, 12.5m, 16.5m, 22.7m, 16.5m, 7.8m and 8.0m for VES 1, VES 2, VES 3, VES 4, VES 5, VES 6 and VES 7 locations respectively. Thus, the average depth to aquifer is at the depth range between 13m and 20m. The geologic layer of this aquifer zone is characterized by structural features like fractures and pore spaces that enhance groundwater permeability and storage.

Keywords: Lithology, Aquifer, Delineation, Vertical Electrical Sounding (VES), 2D Imaging Technique

Discovery, 2023, 59, e26d1027

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Published: March 2023