How to Understand the Effect of the Hydraulic Stimulation in Terms of Hydro-Mechanical Behavior at Soultz-sous-Forêts (France) - Archive ouverte HAL Accéder directement au contenu
Chapitre D'ouvrage Année : 2005

How to Understand the Effect of the Hydraulic Stimulation in Terms of Hydro-Mechanical Behavior at Soultz-sous-Forêts (France)

Résumé

A study, started several years ago, aimed to construct a 3D hydro-mechanical model of the stimulation of the fracture network around each stimulated well at Soultz-sous-Forêts. In the framework of the European project on this "Scientific Pilot Plant", a numerical approach based on the distinct element method (3DEC code) is developed in order to understand and to explain the physical mechanisms which are at the origin of the hydraulic behavior observed during stimulation tests conducted in the various wells. The model is designed to reproduce the observed behavior in terms of pressure-flow curves as well as in terms of location of the stimulated fractures where the fluid is injected. The modeling approach has been first developed on the upper part of the reservoir where a maximum of data are available in the two wells constituting the geothermal doublet at a depth of around 3 500 m. Considering the satisfactory results of the first application, the hydro-mechanical model has been extended to the lower part of the reservoir at depth between 4 500 m and 5 000 m where the three deepest geothermal wells have been drilled. The various modeled cases show the role played by some main parameters on the results of the modeling such as orientation of the main permeable fractures, the intersection between them and their hydro-mechanical properties. The results obtained by the 3-dimensional models show that the permeability increase is highly associated with shearing on some fracture planes. These results also show a significant correlation between the orientations of the permeable fractures in relationship with the orientation of the in situ stresses. In conclusion, these models point out the importance of the knowledge of the geological structural and tectonic context of the site.
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Dates et versions

hal-03740531 , version 1 (01-08-2022)

Identifiants

  • HAL Id : hal-03740531 , version 1

Citer

S Gentier, X Rachez, C Dezayes, A Blaisonneau, A Genter. How to Understand the Effect of the Hydraulic Stimulation in Terms of Hydro-Mechanical Behavior at Soultz-sous-Forêts (France). How to Understand the Effect of the Hydraulic Stimulation in Terms of Hydro-Mechanical Behavior at Soultz-sous-Forêts (France) GRC Transactions, Vol. 29, 2005, pp.159-166, 2005. ⟨hal-03740531⟩

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