TWO DIMENSIONAL ELECTRICAL RESISTIVITY SURVEY AS A TOOL IN DETERMINING AQUIFER WITHIN UNIBEN ENVIRONS

ABSTRACT

2D electrical resistivity method, using dipole dipole and wenner array were caraied out to evaluate aquifer and lithological features suitable to groundwater in University of Benin, Southwestern Nigeria. The instrument used was the ABEM Terrameter SAS 300C Resistivity Meter. The field data were inverted and processed using DIPPROTM 4.0 Inversion software to obtain 2- Dimensional apparent resistivity of the subsurface. The geological interpretation of the resistivity images shows that water bearing formation (aquifer) will most likely to be form at depth greater than 50m in both Wenner and Dipole dipole array of traverse -1 and can be achieve by increasing the electron spacing. This study reveal that at about depth of 50.0m for travers 1 for both Wenner and Dipole Dipole, Water bearing formation (aquifer) was not determined and can only be achieve by increasing the electron spacing. Four lithologies were identified; which are Laterite, clay, wet sand, and dry sand. Variations in their resistivity and depths occurred due to the nature of subsurface rock and and mode of deposition. This study area may hold good prospect for underground water.