2-DIMENTIONAL ELECTRICAL IMAGING TECHNIQUES

ABSTRACT

The purpose of this study is to investigate the thickness of clay deposit in the University of Benin Secondary School, University of Benin, Ugbowo, Ovia North East Local Government Area, Benin City, Edo State, Nigeria. The investigation was carried out by employing a two-dimensional electrical resistivity survey using various equipment such as ABEM terrameter SAS 300C, measuring tape, hammer, electrode, as well as GPS to obtain coordinates of traverses. The survey technique utilized was the Dipole-Dipole array in the explored area to delineate the subsurface resistivity and the data recorded after prospecting with maximum electrode spacing of 250 meters was interpreted using the inversion software (DIPPRO). Geological interpretation of the survey data revealed the presence of clay deposits occurring at an average depth of about 30m and a lateral extent of about 35m for profile 2. For profile 5, Clay deposits also exist at an average depth of about 10m and a lateral extent of about 40m. The resistivity data paints a picture of an area predominantly sand with spares deposits of clay. Areas of possible clay formations have been identified which can be harness for industrial purposes.