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Home  >  Volume 25 (2013)

Lithologic Deduction from Resistivity Studies in Nkwegu, Nigeria by Agha S. O. and Nnabo P. N. Vol. 25 ( Nov. 2013). pp 183-186
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Direct current (D.C) resistivity method was used to study the sub-surface lithology of Nkwegu. Data obtained through depth sounding from four locations within the study area were used in the analysis. The ABEM terrameter signal averaging system (SAS 300C) was the equipment used and schlumberger electrode configuration was employed. The maximum current electrode spread was 300meters. Computer modelling was used for the interpretation of the field data. The depth sounding in two of the locations revealed four geoelectric layers while the sounding in the other two locations revealed five geoelectric layers. The result shows that the average resistivity and  thickness of earth layers in the study area from the surface are 917.64m and 1.3m  for the first layer; 138.89m and 8.8m for the second layer; 480.82m and 17.9m for the third layer and 65.96m and 21.5m for the fourth layer respectively. The result indicates that the first four layers of Nkwegu are made up of lateritic over burden, wet feruginised clay, fissile dry shale and consolidated wet shale accordingly.