Geology, Petrography and Geophysical Study of Kuchibuyi and its Environs Part of Abuja Sheet 186

Geological and hydrogeological mapping of Kuchibuyi and its environs Abuja sheet 186, North Central Nigeria was carried out with a view to determine groundwater potential. The study area fails within the Hydrogeological Crystalline Province of Nigeria. Geophysical investigation was carried out in order to study the subsurface geological layers with a view to determine the depth to bedrock and thicknesses of the geological layers. Rock samples were collected and analysed. Rocks such as Coarse-Grained Granitic Gneiss, Fine Grained Biotite Granite, Medium Grained Granite, Dolerite, Banded Muscovite and Gneiss were the rock types found with structures like Joints, Veins and Foliations. The geologic mapping covered 22.5km2 on a scale of 1:12,500. Vertical Electrical Sounding (VES) using Schlumberger array was carried out at 75 VES stations. Campus Ohmega digital resistivity meter was used for the data acquisition. The field curves were typically of A, H, K, KH and HK types. VES results revealed heterogeneous nature of the subsurface geological sequence and four to five major geoelectrical layers consisting of Topsoil (sand/clay), Lateritic soil, Weathered, Fractured and Fresh Basement. The excellent groundwater potential of Kuchibuyi makes the area hydrogeologically promising and can be explored for groundwater with good yield from location to location.