Hydromechanical characterization of a fractured crystalline rock volume during multi-stage hydraulic stimulations at the BedrettoLab
OPEN ACCESS
Date
2024-12
Publication Type
Journal Article
ETH Bibliography
yes
Citations
Altmetric
OPEN ACCESS
Data
Abstract
Multi-stage hydraulic stimulation experiments were conducted at the Bedretto Geothermal Testbed (Switzerland) at a depth of over 1 km to study seismo-hydromechanical processes at the hectometer scale. Eight intervals with a total length of 206 m were stimulated within a densely monitored, fractured granitic rock volume. Geological characterization shows that all intervals contain NE-SW striking, steeply dipping fractures, but the transmissivity and natural inflow vary between intervals. Reactivation pressures estimated from injectivity increases during stimulation indicate shear reactivation rather than hydraulic jacking, suggesting reactivation of pre-existing non-filled fractures. Overall, the seismo-hydromechanical response to stimulation is heterogeneous and indicates channelized flow.
Permanent link
Publication status
published
Editor
Book title
Journal / series
Volume
124
Pages / Article No.
103126
Publisher
Elsevier
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Underground research laboratory (URL); Multi-stage hydraulic stimulation; Enhanced Geothermal System (EGS); Fractured crystalline rock; Hydromechanics; Bedretto Underground Laboratory for Geosciences and Geoenergies
Organisational unit
03953 - Robertsson, Johan / Robertsson, Johan
03476 - Giardini, Domenico / Giardini, Domenico
03476 - Giardini, Domenico / Giardini, Domenico
02818 - Schweiz. Erdbebendienst (SED) / Swiss Seismological Service (SED)
02334 - BULGG - Bedretto Underground Lab / BULGG - Bedretto Underground Lab
Notes
Funding
182150 - In situ stress variations near faults considering fault zone rock rheology - implications for reservoir stimulation and associated seismicity (SNF)
ETH-06 19-1 - Creating a hierarchy of fracture network in enhanced geothermal systems (EGS) through innovative hydraulic fracturing stimulation (ETHZ)
ETH-06 19-1 - Creating a hierarchy of fracture network in enhanced geothermal systems (EGS) through innovative hydraulic fracturing stimulation (ETHZ)
Related publications and datasets
Is supplemented by: