Abstract

The vertical electrical resistivity survey (VES) utilising the surface Schlumberger electrode array with a maximum current electrode spacing varying from 50 - 500 m has been used to provide valuable information on the hydrogeologic system of the aquifers and the subsurface lithology in Ekakpamre and Uvwiamuge communities. A total of twenty three (23) VES stations were sounded. Four to five geoelectric layers were delineated from the survey area.    The first layer is the topsoil and has resistivity values ranging from 37 - 926 Wm and thickness between 0.5 - 1.5 m. The second layer composed of clay, clayey sand and laterite has resistivity values varying from 22 - 1044 Wm and thickness ranging from 0.4 and 3.6 m. The third and fourth geo-electric layers consisting of fine grained and medium to coarse grained sand with thickness varying from 12 - 105 m corresponds to an aquifer horizon. The resistivity values of the aquifer range from 302 - 2844 Wm. The results of the study show that an aquifer is encountered from the depth of about 5 m in Ekakpamre and Uvwiamuge communities. It extends beyond 45 m depth in Ekakpamre and 105 m in Uvwiamuge. The resistivity survey revealed that the parameters obtained through interpretation of VES curves corroborate the lithologs of boreholes from the area.

Key words: Aquifer, resistivity, hydrogeology, Delta State.