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Jun 21, 2005Keywords:
VLF - EM Electrical Resistivity Linear Features Groundwater Development Basement Complex Area
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Integrated VLF - Electromagnetic And Electrical Resistivity Survey For Groundwater In A Crystalline Basement Complex Terrain Of Southwest Nigeria
Abstract
Very Low Frequency Electromagnetic (VLF-EM) and Electrical Resistivity (ER) methods were integrated in a feasibility study of a basement complex area for groundwater development. Linear features, suspected to be basement fractures, inferred from the VLF - EM anomaly curves, were confirmed by subsurface geoelectric images developed from interpretation results of the Vertical Electrical Soundings (VES).
The delineated basement fractures were penetrated by three test boreholes at various depth ranges of between 7.0 and 13.0 m beneath Borehole (BH) 3 & 4 and 9.0 - 42 m beneath BH5 for unconfined fractures and 36.0 - 38.0 m beneath BH3 & 4 and 128.0 - 188.0 m beneath BH5 for confined fractures. Borehole yields vary from 0.33 - 2.0 l/s, where two abortive (dry) boreholes (BH1 & 2) were previously drilled.
KEY WORDS: VLF - EM, Electrical Resistivity, Linear Features, Groundwater Development, Basement Complex Area.
Global Journal of Geological Sciences Vol.3(1) 2005: 71-80
The delineated basement fractures were penetrated by three test boreholes at various depth ranges of between 7.0 and 13.0 m beneath Borehole (BH) 3 & 4 and 9.0 - 42 m beneath BH5 for unconfined fractures and 36.0 - 38.0 m beneath BH3 & 4 and 128.0 - 188.0 m beneath BH5 for confined fractures. Borehole yields vary from 0.33 - 2.0 l/s, where two abortive (dry) boreholes (BH1 & 2) were previously drilled.
KEY WORDS: VLF - EM, Electrical Resistivity, Linear Features, Groundwater Development, Basement Complex Area.
Global Journal of Geological Sciences Vol.3(1) 2005: 71-80
