USE ELECTRICAL RESISTIVITY METHOD TO INFER SUBSURFACE LITHOLOGY USING DEPTH SLICING APPROACH: A CASE STUDY OF OREROKPE, DELTA STATE NIGERIA
Journal: Pakistan Journal of Geology (PJG)
Author: Star Otitie Umayah
This is an open access journal distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
The goal of this research is to use vertical electrical sounding to analyze the underlying lithological layers of Orerokpe, Delta State, Nigeria. The Schlumberger configuration with a maximum electrode spacing of 200 m was used in 15 VES surveys for the investigation. The data were acquired using ABEM SAS 4000 Terrameter and processed using the WINRESIST program. The data collected were analyzed and interpreted in both qualitative and quantitative terms. Distribution of the resistivity values at different depths are represented by iso-resistivity and electrical profile maps for different electrode spacing, AB at 2 m, 3 m, 4 m, 6 m, 6m (repeated), 9 m, 12m, 15m, 15m (repeated), 20m, 25m, 32m, 40m, 40m (repeated), and 50 m respectively. Results obtained from the study area revealed that geoelectric layers range from 3 to 4. Further findings from the study revealed that the iso-resistivity plot of AB/2 at various depths, it was observed that the area is predominantly underlain with coarse, medium, and fine sand as AB/2 increases.