دورية أكاديمية
THM modeling of hydrothermal circulation at Rittershoffen geothermal site, France
| العنوان: | THM modeling of hydrothermal circulation at Rittershoffen geothermal site, France |
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| المؤلفون: | Bérénice Vallier, Vincent Magnenet, Jean Schmittbuhl, Christophe Fond |
| المصدر: | Geothermal Energy, Vol 6, Iss 1, Pp 1-26 (2018) |
| بيانات النشر: | SpringerOpen, 2018. |
| سنة النشر: | 2018 |
| المجموعة: | LCC:Renewable energy sources LCC:Geology |
| مصطلحات موضوعية: | Deep geothermal reservoir, Thermal anomaly, EGS, Thermo–hydro–mechanical model, Hydrothermal convection, Renewable energy sources, TJ807-830, Geology, QE1-996.5 |
| الوصف: | Abstract Background The Rittershoffen deep geothermal project located 6 km east from Soultz-sous-Forts EGS site (France) includes a doublet GRT-1 and GRT-2 to exploit the geothermal resource at the sediments–granite transition where higher temperatures than those of Soultz-sous-Forêts have been measured. Detailed stratigraphic and geophysical data, temperature logs, and tracer surveys have been collected. However, no reservoir model, integrating large-scale geophysical measurements, exists for this site. Methods We developed a reservoir model in two dimensions (10 km × 5 km) based on a finite element method. It includes thermo–hydro–mechanical (THM) coupling and extended brine properties. A representative elementary volume of 100 m is assumed to homogenize the fault network complexity at small scales. A back analysis is performed to obtain large-scale rock properties using GRT-1 temperature log and regional stress-depth profiles. Results The inverted large-scale properties are consistent with their counterparts measured at the laboratory scale. The bottom of the hydraulic cap rock is 1.2 km ± 0.1 km deep. It is shallower than the discontinuity of the thermal gradient. Hydrothermal convection cells are 2.7 km high which is larger than that previously proposed. Conclusions A very good fit of the GRT-1 temperature log is obtained using our simplified two-dimensional THM model with four homogenized units at a 100 m scale. The comparison between Rittershoffen and Soultz-sous-Forêts models highlights many similarities in terms of rock properties, decoupling of hydraulic and thermal cap rocks and temperature spatial variability (about 50 °C). Predictions of the relationship between reservoir temperature and surface thermal gradients are proposed for future explorations. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2195-9706 |
| Relation: | http://link.springer.com/article/10.1186/s40517-018-0108-1; https://doaj.org/toc/2195-9706 |
| DOI: | 10.1186/s40517-018-0108-1 |
| URL الوصول: | https://doaj.org/article/c739f509da9646279290e527da8b2760 |
| رقم الأكسشن: | edsdoj.739f509da9646279290e527da8b2760 |
| قاعدة البيانات: | Directory of Open Access Journals |
Find this article in full text from Springer Verlag. 
Full Text Finder | تدمد: | 21959706 |
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| DOI: | 10.1186/s40517-018-0108-1 |