CHENILLE: Coupled Behavior Understanding of Faults: from the Laboratory to the Field
<p>The understanding of coupled thermo-hydro-mechanical behaviour of fault zones or in naturally fractured reservoirs is essential both for fundamental and applied sciences and in particular for the safety assessment of radioactive waste disposal facilities. The overall objective of the CHENIL...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2023-03-01
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| Series: | Advances in Geosciences |
| Online Access: | https://adgeo.copernicus.org/articles/58/177/2023/adgeo-58-177-2023.pdf |
| Summary: | <p>The understanding of coupled thermo-hydro-mechanical
behaviour of fault zones or in naturally fractured reservoirs is essential
both for fundamental and applied sciences and in particular for the safety
assessment of radioactive waste disposal facilities. The overall objective
of the CHENILLE project is to better understand the physical processes
resulting from thermal and hydraulic loading in a small fault zone in a
highly consolidated shale formation. Consequently, a thermally controlled
in-situ fluid injection experiment is intended to be performed on a
strike-slip fault zone outcropping at the Tournemire/France Underground
Research Laboratory (URL). A heating system has been installed around the
injection area to enable a precise and controlled incremental increase of
the thermal load. Different monitoring systems are designed to measure the
seismic and aseismic deformation induced either by thermal and/or by
hydraulic loading. The seismic monitoring system is composed of Acoustic
Emission (AE) and broadband seismic sensors enabling monitoring of seismic
fracturing processes down to sub-decimetre scale as well as slow deformation
processes. Furthermore, we are about to install an injection chamber
allowing to perform a controlled gaz injection test. The injection borehole
will also be partly equipped with fiber optics in order to measure
temperature in a distributed manner in the borehole. Time-lapse active
seismic surveys are scheduled for before and after the experiment to image
the structural network but also to detect the appearance of new structures
triggered from the hydro-thermal pressurization of the fault as well as
eventual changes in the velocity field.</p> |
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| ISSN: | 1680-7340 1680-7359 |