Correlation of Self Potential (SP) and Resitivity Survey Methods for Evaluation of Groundwater Potentials: Case Study of Imo State, Nigeria
- Leonard I. Nwosu
- Cyril N. Nwankwo
- Anthony S. Ekine
AbstractA total of seventeen vertical electric surroundings were carried out in Mbaitolu Local Government Area (L.G.A) of Imo State Nigeria, during which apparent resistivity and SP values were simultaneously measured. The field curves obtained reveals a multilayered earth with series of crest and trough for all the sounding stations. VES 6 showed only positive maxima and minima. The distribution of SP values for electrode spacing AB/2 = 100m divides the area into two zones of positive and negative potentials respectively. The anomaly high areas are those of favourable aquifer which form discharge zones with strong lateral flow and high aquifer thickness and transmissivity. Anomaly low areas correspond to areas of infiltration. The depth to aquifer determined from SP survey ranged from 40m to 115m and correlated fairly well with those obtained from resistivity result in 16 out of the 17 stations. The distribution of equipotential lines shown by the contour map divides the area into two zones by a zero potential line suggesting a possible ground water divided in terms of water quality or geologic setting or both. The cross-correlation coefficient computed statistically for each pair of depth points gave correlation significance at the 0.01 level, which validates the results.
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