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Home  >  Volume 32 (Nov. 2015)

Geo-electrical Exploration for Groundwater in Ajelanwa, Owa Otunand Ogga Communities in the Middle-Belt Region of Nigeria by A.K. Olawuyi (pages 365-372)
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Schlumberger Vertical Electrical Soundings (VES)for groundwater explorationinAjelanwa and Owa Otun Communitiesin Kwara State and Ogga in Kogi State,in the Basement Complex terrain ofthe Middle-Belt Region of Nigeria were carried out with a view to establishingthe different subsurface geoelectric layers and the aquifer units.Data were collected from 4, 5and 5 VES stationsat Ajelanwa, Owa Otun and Ogga Communities respectively. From the quantitative interpretationsof the data collected, using the usual method of curve matching with the Orellana-Mooney Master curves and 1-D forward modelingwith WinResist 1.0 version software, up to fourlithologic units were identifiedin these Communities. These include: the topsoil, the weathered layer, the partly weathered/fractured basement and the fresh basement. The weathered layer and the partly weathered/fractured basement constitute the main aquifer units. The depth to bedrock at the chosen VES locations vary from 6 to 30 m at Ajelanwa Community while at Owa Otun and Ogga Communities, it vary from 7 to 13 m and 25 to > 60 m respectively along the chosen traverses. The geoelectrical interpretations of data obtained in these areas have permitted the delineation of some lobesor areas of low resistivity which constitute the prospective zonesfor water exploration in these areas.

      Keywords: Aquifer, Basement, Lithologic unit, Geoelectric and Lobe