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Communication Dans Un Congrès Année : 2013

Multiple-well, multiple-reservoir, long term thermal modeling at Soultz EGS site

Dominique Bruel


Lessons learned from reservoir modeling using a Discrete Fracture Network (DFN) approach in the framework of EGS activity have gradually helped us to better understand a number of coupled THM processes. This resulted in a general improvement of our numerical toolbox FRACAS. The present contribution illustrates a new step forward, which is applied to simulate the exploitation of a multiple-cell reservoir, as it is now the case at Soultz geothermal site. The new hypothesis formulated here is that the fracture network properties in a DFN approach can be regionalized in space according to the sets of micro-seismicity events recorded during the hydro-shearing stimulation phases of the various parts of the reservoir. Special care is given to the numerical treatment of seismic data sets ranging in different catalogues. Main inflow/outflow zones at the 4 deep wells (GPK1, GPK2, GPK3, GPK4) are considered in an explicit way. Hydraulic parameters for the present day exploitation are extracted from past studies, in the upper 3km reservoir tested in 1997, in lower reservoir experienced at 4.5 km depth and partly re-calibrated from the last 2010 circulation phase, with a GPK2 production of about 18 l/s. Extrapolation of hydraulic and thermal behaviors are made for the next 5 years, with an enlarged production rate (+25%), testing the impact of a partial re-injection of cold fluid in GPK1, as experienced in 2011. Model results do confirm in qualitative and quantitative ways, the possibility on running a balanced circulation with limited re-injection pressures. The negative impact on temperature production of fluid re-injected in upper parts of the reservoir and pushed toward production zones at intermediate depths in GPK2 is highlighted.
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Dates et versions

hal-00790212 , version 1 (19-02-2013)


  • HAL Id : hal-00790212 , version 1


Jacques Dentzer, Dominique Bruel. Multiple-well, multiple-reservoir, long term thermal modeling at Soultz EGS site. Thirty-Eighth Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, February 11-13, 2013, Feb 2013, Stanford, CA,, United States. pp.SGP-TR-198. ⟨hal-00790212⟩
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