Geophysical and mineralogical impacts of fluid injection in a geothermal system: the Hot Fractured Rock site at Soultz-sous-Forêts, France
A. Baldeyrou-Bailly, F. Surma, B. Fritz, 2004. "Geophysical and mineralogical impacts of fluid injection in a geothermal system: the Hot Fractured Rock site at Soultz-sous-Forêts, France", Energy, Waste and the Environment: a Geochemical Perspective, R. Gieré, P. Stille
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This paper deals with the geothermal system at Soultz-sous-Forêts, an important research site in France of the European Hot Fractured Rock project. A pilot plant is ready for electric energy production of up to 25–30 MW. Several research projects were developed in France, Switzerland, and Germany in order to study various scientific aspects of the geothermal system in parallel with the industrial development. Of primary scientific interest are the geophysical, geological, and geochemical conditions in the geothermal reservoir as well as the predictable consequences of future exploitation on the quality of the reservoir and on induced environmental problems, including: induced seismicity; rock alteration and possible formation of secondary minerals along the water pathways; and evolution of porosity and permeability in the deep aquifers. This paper focuses on two aspects: the geochemical evolution of minerals in the reservoir due to thermal gradients and fluid flow; and the evolution of physical properties of rocks during fluid injection in the wells. The petrophysical study shows that the fluid-rock interactions can be extensive in the reservoir matrix. The experimental study suggests that the fluid-mineral interactions are dynamic and that clay minerals can precipitate.
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This book provides incentives for further development of sustainable fuel cycles through a novel and interdisciplinary approach to an Earth science-related topic. The main focus is on geochemical concepts in immobilizing, isolating or neutralizing waste derived from energy production and consumption. The book also addresses the issue of using some types of energy-derived waste as alternative raw materials. Moreover, it highlights research on how certain wastes can be used for energy production, an increasingly important aspect of modern integrated waste management strategies. The main objectives are to: (a) identify the most serious environmental problems related to various types of power generation and associated waste accumulation; (b) present strategies, based on natural analogue materials, for the immobilization of toxic and radioactive waste components through mineralogical barriers; (c) discuss modern procedures for reuse of waste or certain waste components; and (d) review the importance of geochemical modelling in describing and predicting the interaction between waste and the environment.