Hydrogeophysical Assessment of Groundwater in a Basement Complex of Southwestern Nigeria
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Date
2021
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Department of Geology School of Physical Sciences, Federal University of Technology, Minna
Abstract
Hydro-geophysical investigation of a fractured basement involving the Very Low-Frequency Electromagnetic (VLF-EM) and the electrical resistivity methods has been carried out within Oye Ekiti town, South-western Nigeria. This study demonstrates the effectiveness of integrated geophysical investigation in groundwater potential assessment in a typical basement complex environment. This was done to access the groundwater potential of the area. Fourteen (14) VLF-EM and Horizontal Profiling (HP) traverses were established. Thirty-one (31) Vertical Electrical Soundings (VES) were conducted at the investigated site. The VLF-EM data were presented as profiles and 2-D images. Horizontal Profiling data were also presented as profiles while the VES data were presented as geologic sections. The VLF-EM profiles and 2-D images identified conductive zones which were confirmed by the subsurface geologic sections developed from the investigation results of the VES. The geologic sections delineated Frye's subsurface geologic layers. These include the topsoil, laterites, sandy clay, weathered basement, and fresh basement. The weathered basement constitutes the main aquifer unit within the study area. The weathered layer is generally thin and clayey. The relatively low weathered basement resistivity could indicate enhanced permeability due to significantly fractured density and the tendency for moderate groundwater potential and yield through the groundwater potential map
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Keywords
Hydrogeophysical, fracture, aquifers, delineation, basement rock, Research Subject Categories::NATURAL SCIENCES