| Popis: |
Radar images, aerial photographs, geoelectrical studies (vertical electrical sounding, VES and horizontal resistivity profiling, HRP), geological logs based on exploratory drilling and the local surfacial geology have been employed for groundwater investigations in the Cross River Sate, southeastern Nigeria. Results from the study show that areas with high lineament frequency and a thick regolith should be targeted for groundwater investigation within the crystalline basement complex terrains, whereas in the sedimentary areas the target areas are determined by the lithology and stratigraphical sequence. Using the results of this study there is an increase in the number of successful boreholes drilled in the area from 35% to 92%. It is also observed that remotely sensed, geoelectric and exploratory drilling data are adequate for delineating the surface and near-subsurface hydrogeology of the area. |
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