Groundwater Exploration in the Basement Complex Around Chibok Area in North- Eastern Nigeria Using Vertical Electrical Sounding Method

Abstract

A geophysical survey employing Schlumberger electrode configuration using vertical electrical sounding (VES) method was carried out around Chibok area within the Basement Complex of north-eastern Nigeria using an ABEM SAS 300C Terrameter with a view to exploring groundwater within the study area. The overburden in the area ranges from about 15m to 58.5m thick. This overburden, based on geoelectrical interpretations, consists essentially of top soil, decomposed crystalline rock, highly weathered crystalline rock, weathered or fractured crystalline rock and weathered to fresh crystalline rock. The study suggest that the vicinities of all the VESs are best suited for the siting of boreholes apart from VES 1 and 5 due to the presence of fresh crystalline rock at shallow depth.

Keywords: Hydrogeology, Basement Complex, Alluvium, Colluviums, Electric resistivity, Chibok