Preliminary non-intrusive geophysical electrical resistivity tomography surveys of a mock-up scale monitoring of EBS at URL Tournemire

Geophysical Electrical Resistivity Tomography (ERT) is a promising measurement technique for non-intrusive monitoring of Engineered Barrier System (EBS) during the operational phase of geological disposal of high-level radioactive waste. Electrical resistivity is sensitive to water content and temperature, which are the key variables characterising the response of the EBS. In order to assess the technology readiness level of the ERT technique for EBS operational monitoring, a field demonstrator has been developed at the URL in Tournemire (France) within the project 'Modern 2020'.
Preliminary ERT surveys were carried out in January and November 2017 to establish the background resistivity of the experimental area and assess the quality of electrode installation and survey protocols. Results of the surveys confirmed that the resistivity of the host rock in the demonstrator area is quite homogeneous and lower than 100Ωm in accordance with independent measurements carried out in previous campaigns. In addition, the lesson learned from the blank tests allowed identifying key requirements for effective ERT measurements. These include the need for a 3D electrode configuration, bespoke measurement protocols designed on the basis of sensitivity
analysis of geometric factors, and collection of reciprocal data for enhanced data
quality control.