From karst bedrock to sand aquifers, two Oklahoma case studies demonstrate how electrical resistivity imaging (ERI) can identify high-permeability zones before drilling begins and deliver the yields rural communities needed.
Groundwater may be one of our most valuable resources, but finding productive water wells is far from straightforward. In complex aquifer systems, drilling without subsurface intelligence can lead to costly dry holes, low-yield wells, and infrastructure that fails to meet community demand.
That’s why Aestus takes a different approach: scan first, know where to drill. By integrating regional geologic information with high-resolution GeoTrax Survey™ electrical resistivity imaging, our team helps clients identify the most promising drilling targets before a rig ever arrives on site. The results can be transformative. The two GeoTrax Survey™ images below illustrate how targeted geophysical investigations helped identify optimal drilling locations in two very different aquifer settings.
In Oklahoma’s Arbuckle Formation, untargeted wells often yield just 5–10 gallons per minute (GPM). A rural water district near Tishomingo used GeoTrax to scan first and drill smart. The result? A high-yield well producing approximately 700 GPM—about 70 times the output of nearby wells. As shown in the top image, GeoTrax accurately identified a fracture zone, visible as the electrically conductive (blue) vertical anomaly near the starred drilling location.
The same story repeated in a sand aquifer in Marshall County. There, typical yields ranged from 8–35 GPM when drilled at random. Using GeoTrax, the team drilled once and hit a ~110 GPM well—nearly three times higher than untargeted averages. In the bottom image, the starred drilling target corresponds to a more electrically resistive interval interpreted as coarse-grained, higher-permeability sand.
What makes these examples especially interesting is that the ideal drilling target looked completely different in each setting. One was electrically conductive; the other was electrically resistive. Identifying those subtle but critical distinctions requires more than technology—it requires experienced hydrogeologists who can integrate geophysics, geology, and groundwater science. The takeaway: Better data leads to better decisions, fewer drilling risks, and more reliable water supplies.
