Geoelectric investigation of groundwater resources and aquifer characteristics in Utagba-Ogbe kingdom Ndokwa land area of Delta State, Nigeria

摘要

Vertical Electrical Sounding data were acquired from 10 locations evenly distributed within Utagba-Ogbe Kingdom. The apparent resistivity values obtained in the field were plotted against half current electrode spacing. Interpretation of data were done both quantitatively and qualitatively and bringing in to bare the knowledge of the local geology of Utagba-Ogbe and her environs. Based on the geoelectric section, which shows the relationship between the drillers log and the resistivity measurements at a common depth of penetration, 4 prominent geoelectric layers of near surface aquifer that are not confined were identified in Utagba-Ogbe Kingdom. The study revealed Utagba-Ogbe Kingdom as an extensive sandy unit. The best layer of the aquifer in Utagba-Ogbe kingdom for groundwater development is at a depth between 35.00 - 45.00 m within the second layer. This layer consist medium-grained sand to coarse-grained sand formations, which is the best formation to obtain an appreciable quantity of water for sustainable groundwater development. The results when correlated with lithologic log from a producing borehole in second Owessei Street Umusadege were found to be consistent.