Two-dimensional Electrical Resistivity Tomography of Bitumen Occurrence in Agbabu, Southwest Nigeria
O. F. Ogunlana *
Department of Physics, Ekiti State University, Ado Ekiti, Ekiti State, Nigeria.
O. M. Alile
Department of Physics, University of Benin, Benin City, Edo State, Nigeria.
O. J. Airen
Department of Physics, University of Benin, Benin City, Edo State, Nigeria
*Author to whom correspondence should be addressed.
Abstract
The Electrical Resistivity Tomography (ERT) data was acquired within the area suspected to have high potential for bitumen occurrence using the Wenner-Schlumberger configuration in Agbabu, southwestern Nigeria. PASI 16GL-N Earth resistivity meter instrument was used to acquire data along five (5) traverses with 5m electrode spacing and traverses length of 150m. The apparent resistivity values obtained was processed using RES2DINV software which helped to automatically obtain the 2D inversion model of the subsurface. This study has shown the occurrence of bitumen between the depth of 13.4m and 9.93m for Traverses 1, 2, 3 and Traverses 4, 5 respectively in a 2-Dimensional electrical resistivity images for boreholes with a depth of about 18m. The results indicate that the bitumen is characterized by good lateral continuity and is sufficiently thick for commercial exploitation.
Keywords: Electrical resistivity, bitumen occurrence Agbabu, Nigeria