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Home  >  Volume 27 (July 2014)

38. Earth Resistivity Measurement for Ground Water Distribution in Patani Area of Delta State, Nigeria by Oseji, Otutu Julius.Volume27, (July, 2014), pp315 – 322
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Abstract

The execution of water borehole project is expensive; there is therefore the need for surface resistivity measurements before drilling. Vertical Electrical Sounding (VES) using Schlumberger configuration is one of the most reliable geophysical techniques and was carried out in Patani area of Delta state to obtain and document not only the layer/s of the near surface aquifer but to determine the thickness and depth to the aquifer and hence recommend the area/s boreholes could be drilled for potable and sustainable water supply. A total of 7vertical electrical soundings data were obtained from 7 locations evenly spread and spaced using the Schlumberger array method. The apparent resistivity values obtained in the field were plotted against half current electrode spacing in a log-log graph. The resulting curves were interpreted both qualitatively by inspection and quantitatively by matching small segments of the field curves using two-layer model and their corresponding auxiliary curves. The resistivity and thickness obtained from the partial curve matching were improved upon by employing an iterative computer program to obtain the layer parameters. The type of curves, the resistivity of the sediments and the knowledge of the local geology of Patani were used as guides in the analysis and interpretation of the layer parameter in terms of probable and sustainable water supply.
The Geoelectric section of Patani revealed one aquifer within the third and the fourth geoelectric layers of the earth. This layer consists of the medium to coarse sand formations of resistivity values ranging from 109.0  to 200   with an average thickness of 20m.
Generally, boreholes could be drilled to a maximum depth of 32.0 m to the fourth layer within the medium to coarse sand except in Ekise and Farkas where it has to be drilled to a depth of 20.0m for an appreciable and sustainable quantity of water.
It could therefore be concluded that boreholes for potable, appreciable and sustainable water supply should be located at Ekise area in Patani main town to a depth of 20.0 m, since the area has the highest thickness of aquifer of about 22.2 m and is confined.

    Keywords:Patani, potable water, contamination, Oginware, Taware, Ekise, Farkas, Secretariat, Osuware, boy’s     model, geoelectric section and resistivity


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