APPLICATION OF ELECTRICAL RESISTIVITY IMAGING AND INDUCED POLARIZATION METHOD FOR GROUNDWATER EXPLORATION AT AHMADU BELLO UNIVERSITY PHASE II, ZARIA, NIGERIA.

Lukman Adesina Olayinka

Abstract


Two-dimensional resistivity and induced polarization surveys have successfully been used to characterize the subsurface earth materials for groundwater exploration at Ahmadu Bello University Phase II, Zaria, Nigeria. Two imaging profile lines were established, with each profile length of 200 m. The electrical resistivity and induced polarization measurement on each profile lines were achieved using Wenner electrode array configuration. The data obtained from the survey were processed and interpreted using Res2Dinv software. The results of the 2D imaging profiles of resistivity and chargeability were calibrated using borehole data of the study area.  The profiles revealed two to three layers, which comprises of brownish lateritic sandy clay, light brown clayey sand and greyish hard weathered rock. The possible location of fractured zones for groundwater exploration was mapped out from the imaging profiles. The zones have the resistivity and chargeability value of range between 0 – 62.8 Ωm and 0.0001-0.167 ms respectively with a thickness of 9 m. Based on the results obtained from this study, it shows that groundwater exploration is feasible in the study area and drilling for the exploration of water should be targeted towards the fracture zone because it is hydro-geologically good in basement complex rock. In general, resistivity and chargeability values alongside borehole data have been used to provide better interpretation for groundwater exploration in the basement complex.

Keywords: Two-dimensional resistivity, induced polarization, groundwater, fractured zones and hydro-geological.


Full Text:

PDF

Refbacks

  • There are currently no refbacks.




FEDERAL UNIVERSITY DUTSIN-MA, KATSINA STATE - Copyright 2019