INTEGRATED GEO-ELECTRICAL AND ELECTROMAGNETIC PROSPECTIVITY FOR GROUNDWATER POTENTIAL OF GRID ‘PART A’ OF FELELE CAMPUS, FEDERAL UNIVERSITY LOKOJA, NIGERIA
Isaac O. Agbane1*, Ogbadu R. Omeje2, Dayo J. Olutokun3 and Esther A. Yahaya3
1Department of Geology, Federal University Lokoja, Nigeria
2Department of Geology, Kogi State University, Anyigba, Nigeria
3Department of Physics, Kogi State University, Anyigba, Nigeria
*Email: agbaneisaac@gmail.com
ABSTRACT
Geophysical investigation involving the use of vertical electrical sounding
(VES) on grid-A part of Felele campus, Federal University Lokoja, Nigeria
with objectives to delineating depth to fresh basement, fractured zones
in the study area for potential groundwater exploration within the
crystalline basement rocks. The area is underlain by the Crystalline
Basement rocks composed of granite gneiss, quartzite and intrusions. PASI
Terrameter was used and the symmetrical Schlumberger configuration
adopted. A total of four (4) Vertical Electrical Sounding (VES) stations were
established. Preliminary input data from the field were inputed into the
WINRESIST software to generate real resistivities and depths to
geoelectric layers. Three (3) geoelectric layers were interpreted, the first
layer is the top soil made up of resistivity values ranging from 141 Ωm –
486.1 Ωm and depth to weathered basement of 1.2-2.5m. It is inferred that
this layer does not consist of the same material across the entire length of
the profile. The second layer is made up of resistivity values ranging from
37.9Ωm to 85.6Ωm and depth to fresh basement of 11.2 – 16.1m. Its
inferred to composed mostly of fractured and unconsolidated rocks, loose
gravel, sandy soil and clayey. The resistivity value within this layer indicates that is it good for groundwater exploration and the third layer has the highest resistivity values ranging from 821.2 Ωm – 2695Ωm with an infinite depth. It’s entirely composed of fresh basement rock which is possibly of the gneissic suite.
Keywords: Basement rocks, Fractures, Geoelctric layers, ground water,
lokoja, schlumberger
