V3I10P37

Delineation of Quaternary Aquifer Using Vertical Electrical Sounding (VES) in Ogbia Area, Bayelsa State, Nigeria

Daniel, Tenemeni Ebi^1*, Udom, Jeremiah Godwin², Ferdinand D. Giadom³

Abstract

Electrical resistivity method using the schlumberger configuration were employed to delineate the quaternary aquifer in Ogbia area of Bayelsa State, Nigeria. The aim of this research is to determine the viability of the aquifer for borehole drilling.  10 VES points were carried out in Ogbia Area. They were interpreted by the use of IP12Win software. The interpreted VES data revealed 4-5 delineated layers of silty-clay, clay, clayey sand, sandy-clay, fine to coarse sand.  Five sounding curve types were identified in the study area and they are of the KA, HA, QH, AK, and HKH types. The first aquifer were delineated at average depth of 23m and 30m with thicknesses ranging from 9.2m to 26m and resistivity ranging from 453 to 8254Ωm while the 2nd aquifer were delineated at average depth of 37m to 43m with thicknesses ranging from 19.2m to 27m and resistivity values ranging from 740 to 9086Ωm. The second aquifer in the area are more reliable as sources of groundwater because they are less vulnerable to infiltration of surface contaminants and as well as possess better indices for higher groundwater yield due to their texture and greater thickness when compare to the first aquifer.

Keywords:

Groundwater, VES, geo-electric layers, aquifer, resistivity, Ogbia