Application of Integrated Geophysical Methods for Groundwater Exploration in Iworoko-Ekiti, Southwestern Nigeria
Keywords:
Basement Complex, Electromagnetic, Electrical Resistivity, Groundwater, Iworoko-EkitiAbstract
Electrical Resistivity and Electromagnetic Methods were adopted to probe the subsurface formation of the Isaba Garri processing Industry environment as a result of challenges experienced in groundwater production. The environment falls on a big outcrop of land where proximity of locating a position for a borehole has been difficult. The Impact method, Electromagnetic method using gradient array method and Three Vertical Electrical Soundings were established along a single 120 m traverse orientated in a north-south direction. The Electromagnetic approach served as a pre-study for the establishment of the VES. The EM and VES methods revealed different geologic formations which are; topsoil, weathered layer, fresh basement and fractured basement with resistivity range of 96 – 976, 1396 – 2380, 4546 – 28594 and 126 ohm-m, and thicknesses range of 1.2 – 2.9, 5.3 – 6.2, 4.1 to infinity and 10.7 m respectively. The result revealed that VES 1 located at the southern part of the study, is good enough for borehole drilling for the successful running of the Industry.
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