Groundwater exploration in a typical southwestern basement terrain | ||
| NRIAG Journal of Astronomy and Geophysics | ||
| Volume 9, Issue 1, January 2020, Pages 289-308 PDF (4.71 M) | ||
| DOI: 10.1080/20909977.2020.1742441 | ||
| Authors | ||
| C. C. Okpoli; P. Ozomoge | ||
| Abstract | ||
| Integrated geophysical techniques were applied for groundwater exploration in a typical southwestern Nigeria basement terrain. EM-3D was primarily used to map out the precise subsurface conductive zones before adopting the recommended sounding locations with aid of Vertical Electrical Sounding (VES) technique. Hydraulic parameters were also estimated and plotted. Twenty Electromagnetic (EM) horizontal profiling and Schlumberger methods were conducted in E-W and N-S direction across the site. The points where the inflection of the raw real intersects the positive peak of the filtered real are diagnostic of major conductive zones suspected to be faults/fractures. Possible groundwater flow paths that identified as conductive zones were used in picking locations for VES deep sounding. The VES conducted on the conductive zones, which are labelled V V V and V were characterised by good aquifer resistivity values with relatively thick overburden, which are the major factors in determining the groundwater potential of an area in a typical basement complex, while those carried out on the non-conductive zones labelled V and V were characterised by poor indication to groundwater potential of the area. | ||
| Keywords | ||
| Electromagnetic; VES; hydraulic parameters; Schlumberger; Groundwater | ||
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