GEOPHYSICAL INVESTIGATION USING 2-DIMENSIONAL RESISTIVITY METHOD FOR SUBSURFACE LITHOLOGY AT BLOCKS OF FLAT UNIVERSITY OF BENIN

ABSTRACT

Geophysical surveys utilizing 2-Dimesional Resistivity method was conducted at Blocks of Flats, University of Benin, Benin City Nigeria, to characterize subsurface lithology and create a comprehensive base map of the area. Two parallel traverses were undertaken for the 2-D Electrical Resistivity Imaging (ERI) using the Wenner Schlumberger array configuration.The 2-D Electrical Resistivity data underwent processing through inversion of the 2-D apparent resistivity data using RES2DINVX64 software to generate the 2-D inverted resistivity section. The outcomes of the 2-D ERI delineated three to five resistivity structures across the two traverses, indicating the presence of clay/clayey sand, sand, and sandstone within a lateral distance of 200m and depths ranging from 39.6 to 57.3m across each traverse. Resistivity values generally ranged from 16.8 to 75542Ωm across Traverse 1 and 2. The clay/clayey sand, clayey sand, sand, and sand/sandstone exhibited resistivity values ranging from 24.7 to 227Ωm, 95.5 to 291Ωm, and 322 to 7554Ωm, respectively.