Resistivity Imaging. What is it?
Resistivity imaging, a cutting-edge scientific technique, holds the key to uncovering valuable information about the underground world. By injecting voltage into the ground and carefully measuring current, we can identify high and low resistive anomalies hidden beneath the surface. When it comes to groundwater, which presents a low resistive anomaly, this technology offers remarkable advantages over traditional methods like drilling wells without lithological data.
Recent advancements have enabled us to connect a network of 84 electrodes using an extensive 1200-meter cable. Guided by a computer, our instruments collect data at various intervals along the survey line, generating approximately 6000 data points for a single survey. These surveys typically range from 300 meters to 1.2 kilometers in length, with a depth penetration of 15% to 25% of the survey line. For instance, a 1000-meter survey line would provide data from 150 to 250 meters below the surface.
Inversion
Once all the data is gathered, it undergoes processing using the powerful Earth Imager 2D software. This intelligent program pieces together the puzzle, transforming the data into a clear and visually appealing two-dimensional graph. This graph provides an easily understandable representation of the property, indicating areas that may hold groundwater resources and those that are less likely to do so.
Our surveys are conducted using the state-of-the-art Advanced Geosciences Super Sting R8/IP resistivity meter, with data processing facilitated by the AGI EarthImager 2D inversion and modeling software.
Link to AGI Site Supersting
http://www.agiusa.com/supersting.shtml
Link to Earthimager 2D software
http://www.agiusa.com/agi2dimg.shtml
Process:
This comprehensive process ensures accurate and reliable results.
During the survey, each electrode is securely inserted into the ground and backfilled with a Bentonite slurry, enhancing electrical conductivity for precise measurements. The survey cables, comprising the main cable housing and 84 inner cables, enable independent injection of DC current to each electrode. Simultaneously, eight other electrodes capture the readings, while the Super Sting Instrument records the injected and received currents.
With a survey cable length typically ranging from 400 to 1200 meters, the depth of data collection corresponds to the length of the survey line. Deeper insights into the underground environment can be obtained by employing longer survey lines.
Through the power of 2D resistivity imaging, we unlock the hidden potential of water resources, providing a comprehensive understanding of aquifers on your property. Say goodbye to uncertainty and embrace a more informed approach to water exploration.
Example of final data:
Links to case Studies: