Correlation of Borehole Lithology Using Vertical Electrical Sounding (VES) Method for Groundwater Exploration in Part of Otuoke Bayelsa State Nigeria

P.P. Adejumo¹ , I.E. Ottih² , A.N. Nwori³

Section:Research Paper, Product Type: Journal-Paper
Vol.7 , Issue.12 , pp.18-27, Dec-2021

Online published on Dec 31, 2021

Copyright © P.P. Adejumo, I.E. Ottih, A.N. Nwori . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
In this work, the vertical electric sounding (VES) method was applied in parts of Otuoke Bayelsa State Nigeria and geoelectrical stratigraphy obtained correlates with the borehole lithology within the area for groundwater exploration and development. Five VES points with maximum and minimum electrode spacings of 350 m and l00 m respectively were used to determine the apparent electrical resistivity of the subsurface layers. The field resistivity sounding survey was carried out in these locations with an ABEM terameter (signal averaging system 1000). The field data obtained were interpreted using IP2 win computer software. The result of the interpreted VES data was used to correlate the drilled borehole logs which confirmed the following stratigraphy; sandy clay (19-584 ?m), dry sand (77.2-737 ?m), clay (2.44 ?m) and saturated fine/coarse sand (3.65-566 ?m) as an aquifer. Geophysical VES reports and borehole logs confirm that the area is a homogeneous formation consisting of the same lithological characteristics as sand and clay. The resistivity curve interpreted A, K and HK type curve layers. The available borehole lithology in the study area matches pretty well with the geoelectric stratigraphy. The results of our correlation revealed that almost all the five VES stations intercepted good aquifer zones for portable groundwater development in the area.

Key-Words / Index Term :
Groundwater, Geoelectric layers, Schlumberger, Borehole lithology, Correlation

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