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ABSTRACT
Geophysical methods frequently serve as tools for solving various geological problems. For this study, the two-dimensional electrical resistivity imaging survey (ERI) technique was conducted within the sport complex of Ambrose Alli University, Ujemen, Ekpoma to classify the subsurface, in order to determine the applicability of 2D resistivity imaging in studying the subsurface stratigraphy and geological structure. This became necessary due to either no previous history of tectonic events after the deposition of the Bende-Ameki Formation that underlies the study area or there is no river draining the study area. These would have helped expose the lithostratigraphic sections or unit of Benin-Ameki Formation that underlies the study area. The study area is underlain by sedimentary rocks with about 90% of sandstone and shale intercalation. The Wenner-Schlumberger electrode configuration was carried out to map the electrical properties with the aim of delineating the subsurface lithological characteristics in order to produce a robust subsurface model. With inter profile separation of 50 𝑚, nine (9) profiles with an electrode separation of 10m were laid using the Pasi Earth Resistivity Meter (16-GL) model. The acquired resistivity data were converted from the apparent resistivity data to produce an image of true depth and true formation resistivity (2D geologic model section) using RES2DINV software. The 2D resistivity geologic model produced a high quality structural resolution leading to the delineation of various lithological units, and identification of structures such as folds and fault. From the interpretation of geoelectric images obtained in the study area, the maximum depth of probing achieved in the present study is 23 𝑚. The study reveals the presence of two distinct layers, the upper unbedded mixed lateritic sandstone containing several sedimentary structures, and the bedded sequence at the base having a low dip of less than 5 °
