Abstract

Geoelectrical logging was conducted in two well locations in Ubima community, Niger Delta, Nigeria. Self-Potential (SP) and Resistivity (Short Normal and Long Normal) logs were employed. Two points each in wells 1 and 2, respectively, were tested to determine the porosity (ɸ), permeability, k and the total dissolved solids (TDS) in the aquifer by derivation from electrical conductivity (EC). The results show that for test zones A and B in well 1, porosity and permeability had values of 20.6% and 49 mD, respectively, at depth range of 105 to 120 m and values of 19.4% and 34 mD, respectively, at depth range of 120 to 140 m. The total dissolved solid (TDS) derived from electrical conductivity range of 869.5 to 877 μmhoscm-1 is between 556 and 561 ppm for these zones. For well 2, test zones A and B, the porosity and permeability values observed were 23.7% and 108 mD at depth range of 80 to100 m and values of 22.0% and 71 mD at depth range of 100 to 120 m, respectively. A TDS value of 400 ppm was observed for both test zones in this well. This implies that screening and casing installations should be done between 90 and 110 m to ensure that a prolific and good water quality aquifer is delineated for borehole water project in this community.

Key words: Geoelectrical logging, well screening, prolific aquifer, Ubima, Niger Delta.