Resistivity Contrast and the Phenomenon of Geophysical Anomaly in Groundwater Exploration in A Crystalline Basement Environment, Southwestern Nigeria

Authors : Bawallah Musa ADESOLA, Adiat Kola ABDULNAFIU, Akinlalu Ayokunle ADEWALE, Ilugbo Stephen OLUBUSOLA, Akinluyi Francis OMOWONUOLA, Ojo Bosede TAIWO, Oyedele Akintunde AKINOLA, Bamisaye Oluseyi ADUNOLA, Olutomilola Olabode OLUSOLA, Magawata Usman ZAYYANU

Pages : 23-36

View : 40 | Download : 11

Publication Date : 2020-12-15

Article Type : Research Paper

Abstract :In absence of magnetic, gravity, electromagnetic and seismic refraction tools, Lateral Resistivity Profiling insert ignore into journalissuearticles values(LRP); has been engaged as major tool in the study of deep-seated geological structures for the evaluation of structural trend and settings for groundwater exploration in a complex geologic environment of Southwestern Nigeria. Twenty LRP using wenner configuration was used to delineate zones of resistivity contrast anomaly insert ignore into journalissuearticles values(weak zone); diagnostic of fracture, fault, cracks, joints and highly weathered geologic materials. Thirty-three Vertical Electrical Sounding insert ignore into journalissuearticles values(VES); using schlumberger configurations was carried out on the zones of resistivity contrast insert ignore into journalissuearticles values(weak zones); to delineate geoelectric sequence and layer stratification. The results from the VES were used to generate geoelectric section, geoelectric maps and also to determine the second order parameters. Groundwater potential map was also generated from the integration of geoelectric parameters using Multi-Criteria Evaluation Techniques insert ignore into journalissuearticles values(MCDA);. The model was classified into low, moderate, high and very high groundwater potential zones and all identified points was drilled and the boreholes was very productive, which were used to validate the accuracy of the groundwater potential map. M-formula was used to determine the groundwater yield index value to model the groundwater yield map. All the result obtained has been found to be very relevant in groundwater evaluation of the study area and thereby justifying the relevance of LRP as a major tool in groundwater exploration before carrying out VES.
Keywords : Lateral Resistivity Profiling, Vertical Electrical Sounding, M formula, Groundwater Yield, Akure Metropolis

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