1 / 7

Electrical Resistivity Tomography (ERT) as a tool for investigation of subsoil in fault zone

Electrical Resistivity Tomography (ERT) as a tool for investigation of subsoil in fault zone.

kristophera
Download Presentation

Electrical Resistivity Tomography (ERT) as a tool for investigation of subsoil in fault zone

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Electrical Resistivity Tomography (ERT) as a tool for investigation of subsoil in fault zone As part of « fault-fluids project » the HydroSciences Montpellier (HSM) laboratory is using some geophysical method to investigate in depth. Indeed, structure of fault zone has to be known to understand the flows rules in and through the fault. Thus, we crosscheck geological field data with ERT profiles. ERT method is very appropriate for our study because we can see structure and nature (lithology depend of resistivity) of subsoil. Plus, ERT tool can inform about the presence of water (excellent electrical conductor) or air (very resistive). Therefore, we can show the presence and the saturation of karst conducts (photo 2).

  2. Picture of the CRITEX ERT equipment in use on Cretaceous limestones (Le Triadou, France).

  3. Outcrop : W E 160 m

  4. Outcrop interpretation W E 160 m

  5. Outcrop interpretation W E 160 m N°075 ; 30°N n1 j9 n2 20 m cave entrance

  6. Crosschecking with ERT method W E

  7. Crosschecking with ERT method W E Berriasian limestones Fault Zone Karstic cave 160 120 80 40 0 water table: 65m NGF Valanginian marls Jurassic limestones Karstic cave ? Mix Dipôle-Dipôle & Wenner-Schlumberger

More Related