2D Electrical Resistivity Imaging for the Investigation of the Subsurface Structures at the Proposed Site for Kauridan Estate at Ibagwa - Nike, Southeastern Nigeria

Abstract

Electrical resistivity imaging survey was carried out at the proposed site for Kauridan Estate at Ibagwa - Nike, Southeastern Nigerian, in order to investigate the suitability of the subsurface geological structures for the housing estate. The multielectrode ABEM Lung resistivity meter system, employing the Wenner array, was used to acquire 2D resistivity data sets along six parallel profiles in the survey area. The acquired data was processed and interpreted using Res2DINV software to produce the 2D inverse resistivity models. The subsurface images showed that the near surface materials, up to a depth of about 7m from the surface, have moderately high resistivity range of 728 - 1100Ωm, and were inferred to be coarse sand and gravel. These materials were underlain by other materials of a lower resistivity range of 164-358Ωm at a depth of 26.2m, which vary from shaley sand - shale. The images did not suggest the presence of clay formations or any other building constraints such as fractures, faults or voids.