Reactivity of Geothermal Reservoir Rocks under Temperature Conditions Found in the Upper Rhine Graben (Germany)

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• 作者：Roman B. Schmidt^a ; ^{roman.schmidt@kit.edu} ; Kurt Bucher^b ; Niklas Mundhenk^c ; Ingrid Stober^a
• 关键词：Fluid-rock interaction ; geothermal energy ; alteration reactions ; analcime ; Upper Rhine Graben
• 刊名：Procedia Earth and Planetary Science
• 出版年：2017
• 出版时间：2017
• 年：2017
• 卷：17
• 期：Complete
• 页码：881-884
• 全文大小：275 K
• 卷排序：17

文摘

Deep seated fault systems play an important role for deep geothermal applications, particularly in volcanic inactive regions with low natural matrix permeability, such as the Upper Rhine Graben (URG, SW Germany). Fluid migration and heat transport occur through a network of connected fissures and faults, which generally are saturated with highly saline fluids. Alteration processes of primary mineral phases are a crucial for the evolution of the fissure permeability and thus, the lifetime of the geothermal reservoir. The aim of this experimental research is to investigate the interaction between reservoir rocks and synthetic close-to-nature brines to comprehend the alteration path from primary minerals to an alteration mineral assemblage. Primary reactions are intense quartz dissolution, chloritization of biotites in the granite samples, albitization of K-feldspar (granite and sandstones) and an extensive precipitation of highly euhedral analcime crystals on the surface of sandstone samples.