INTERPRETATION OF RESISTIVITY DATA IN IDENTIFYING POTENTIAL AQUIFER HORIZONS AT CHOBA FIELD, UNIVERSITY OF PORT-HARCOURT, RIVERS STATE, NIGERIA

Interpretation of Resistivity Data for Extracting Subsurface Geological Parameters at Choba Field, University of Port Harcourt, the accurate characterization of subsurface geological formations is essential for various environmental, hydrogeological, engineering, and geotechnical applications.This study applies electrical resistivity methods,specifically Vertical Electrical Sounding (VES), to delineate lithological layers, identify potential aquifer horizons, and assess soil strata within Choba Field, University of Port Harcourt. The study area is underlain by the Benin Formation, a major aquifer system within the Niger Delta Basin, characterized by unconsolidated sands interspersed with clay lenses. Given the rapid urbanization in southern Nigeria, understanding groundwater distribution and geological stability is crucial for sustainable development. A Schlumberger electrode configuration was employed to collect resistivity data, which was processed using RES2DINV software to generate resistivity-depth curves and geoelectric sections. The interpretation reveals a five-layer stratigraphic sequence with alternating resistivity trends. Layer 2, with elevated resistivity, suggests compact formations influencing groundwater movement, while exhibits significantly high resistivity, indicating a potential aquifer zone at 47 meters depth. Conversely, Layer 5 presents the lowest resistivity, likely due to high moisture content or contamination. Visual analysis of the geoelectric section and VES curve confirms heterogeneous subsurface properties, highlighting distinct lithological boundaries. The resistivity variations provide valuable insights into lithological properties, fluid storage, and groundwater quality. The high-resistivity aquifer zone necessitates further validation through borehole testing to confirm its suitability for water extraction. Overall, this study contributes to subsurface geological mapping and underscores the importance of resistivity techniques in groundwater exploration and infrastructure planning, supporting sustainable resource management within the University of Port Harcourt and its surrounding communities.