Significant Of Geology and Geophysical Investigations in Groundwater Prospecting. A Case Study From Hard Rock Terrain Of Southwestern Nigeria

Abstract

Electromagnetic (EM) profiling and VES are the two complementary and widely used geophysical methods in the delineation of basement regolith and location of fissured media and associated zones of deep weathering in crystalline terrains. In many instance, reconnaissance EM surveys are used to locate aquiferous zones such as fractures, faults and joints while Vertical Electrical Sounding on the other hand provides information on the vertical variation in electrical resistivity with depth. It is commonly used to assess the reliability of the fractures delineated from EM survey (Ariyo, et al, 2008, Olayinka et al, 2004).