A systematic field survey has been carried out to collect data using the GD-10 Multi-Electrode Resistivity Imaging System and Aquameter CRM-500 Resistivity meter at open space of NIT Raipur campus during September 2020-October 2020 (Fig. 2)
Fig. 2: Field survey photographs.
GD-10 Multi-Electrode Resistivity Imaging System
GD-10 is developed based on the latest digital and analog circuitry technique, making it the worldleading multi-functional direct current (DC) method instrument. GD-10 Multi-Electrode Resistivity Imaging System is capable of conducting 2D/3D cross-section profiling of subsurface lithology. through the array script management in Geomative Studio, we can predefine survey parameters prior to field surveys. Up to 3200W (800V*4A) transmission power can be deployed in the field. GD-10 is equipped with both centralized cabling and distributed cabling system to fulfill any complex field environment
Aquameter CRM 500 Resistivity Meter
CRM 500 generates a well-regulated current (I) measure the resulting signals voltage ΔV between the two potential electrodes. It then calculates the apparent resistivity R= ΔV/I for the given spacing configuration. The resistivity obtained is the weighted average of all the formations' resistivity through which the current is passing. Apparent resistivity is expressed in Ohm-meter(Ω-m). The analysis of apparent resistivity variations as a function of current electrodes' spacing makes it possible to conclude subsurface geological conditions.
In this study, one horizontal profiling using GD-10 Multi-Electrode Resistivity Imaging System was carried out to assess the subsurface geological heterogeneity. Vertical Electrical Sounding (VES) using the Schlumberger method of maximum current electrodes spacing of 300 m using Aquameter CRM 500 Resistivity Meter.
The layer parameters are obtained from the recorded field resistivity data using Res2DInv Aarhus GeoSoftware for Multi-Electrode Resistivity Imaging System and the resistivity meter1-D sounding inversion program IX1D v3 software used to assess the subsurface geological heterogeneity are obtained from the recorded field resistivity data (VES)
Fig. 3: 2D Subsurface heterogeneity in the NIT Raipur campus.
Fig. 4: 1D Subsurface heterogeneity in the NIT Raipur campus.
We have conducted geoelectric imaging using the Wenner profiling and Schlumberger sounding using GD-10 Multi-Electrode Resistivity Imaging System and Aquameter CRM 5000, respectively. The present study indicates that there is an occurrence of subsurface inhomogeneous rock materials in the study area. Data collected using GD-10 Multi-Electrode Resistivity Imaging System and Aquameter CRM 5000 supporting each other results, reflecting the equipment's efficiency. This study found that GD-10 Multi-Electrode Resistivity Imaging System is more effective, easy to use, flexible survey layout, and convenient for subsurface heterogeneities assessment.
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