Application of Electrical Resistivity Method in Delineating Brine Contaminated Aquifer in Abakpa Area, Lower Benue Trough, Nigeria


Authors : Akiang, F. B." George, A. M." Ibeneme, S. I. "Agoha, C. C.

Volume/Issue : Volume 5 - 2020, Issue 4 - April

Google Scholar : https://goo.gl/DF9R4u

Scribd : https://bit.ly/2RVXMU7

Electrical resistivity prospecting using Vertical Electrical Sounding (VES) technique was conducted in Abakpa Area of Cross River State. The study was meant to delineate fresh water aquifer and brine (saline water) contaminated zones, identify locations not infiltrated by brine, estimate aquifer thickness and determine the depths to fresh water producing aquifer in the area. Fifteen soundings were carried out using Schlumberger electrode configuration with a maximum current electrode spread of 500m. A Syscal resistivity meter model SS-MP-ATS was used to measure the ground resistance in order to compute the apparent resistivity of the subsurface. Lithology log data of some boreholes in the area and resistivity software was used to enhance interpretation. The study revealed three to seven geoelectric layers. The saline water and brackish water saturated layers have resistivity ranging from 0.3Ωm to 12.4Ωm while fresh water saturated aquifer has resistivity from 12.5Ωm and above. Both saline and fresh water aquifer occur in shale, siltstone and sandstone formation. The depth to aquifer in the location ranges from 7.8m to 56.9m while the thickness of aquifer ranges from 6.8m to 41.3m. The study area is characterized by multi aquifer system with some locations producing both saline and fresh water aquifer

Keywords : Brine, Contaminated Zones, Electrical Resistivity, Vulnerable Zones, Delineated Geoelectric Layers.

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