Coupled Geomechanical Study for the Evaluation of Fault Stability and Microseismic Events of the ECOGI Geothermal Field
A. Mandiuc, Ch. Spyrou, G. Sosio and C. Baujard
Event name: Fourth Sustainable Earth Sciences Conference
Session: Geothermal Energy II - Technology Development
Publication date: 03 September 2017
Info: Extended abstract, PDF ( 1.42Mb )
Price: € 20
In the framework of the ECOGI geothermal project in Alsace, eastern France (Baujard et al. 2017), an integrated geological, fluid flow, and geomechanical model of the Rittershoffen site was built (Sosio et al. 2016). This paper completes that study by improving the coupled geomechanical simulation, notably by reviewing the previous discrete fracture network model and incorporating it in the simulation, and demonstrates a workflow to predict the fault reactivation and microseismic event generation induced by geothermal operations. This prediction, based on finite-element simulations of the stress and plastic deformations linked to the changes in pressure and temperature, is matched with the observed microseismic events (Lengline et al. 2017) to validate the mechanical model.