Tridimensional geometry of the limestone-quaternary cover interface
Electrical tomographies are the ideal tool for differentiating resistant units to more conductive ones. The resistivity contrast between resistant limestones and conductive clayey lacustrine sediments is particularly suitable for this method. A regular grid of electrodes covering 8,000m2 allowed to make a real 3D ERT acquisition.
3D inversion procedures adapted to this type of dataset allows the possible restitution of underground resistivities as a three-dimensional block. Advanced visualization tools bring advanced analysis and interpretation of these results.
The final 3D volume allows us to clearly highlight the limestone top interface (between 0 and 8 meters below ground level).
|Geometry||96 electrodes, 10m grid|