[S-MP44] メルト－延性－脆性岩体のダイナミクスとエネルギー・システム

[SMP44-P04] 超臨界地熱貯留層のナチュラル・アナログ

ポスター講演3分口頭発表枠

*土屋 範芳¹、山田 亮一¹、宇野 正起¹ (1.東北大学大学院環境科学研究科)

キーワード：超臨界流体, 地熱貯留層, 花崗岩－斑岩システム

To understand the geological properties of a supercritical geothermal reservoir, we investigated a granite?porphyry system as
a natural analog. Quartz veins, hydrothermal breccia veins, and glassy veins are present in Neogene granitoids, Tohoku Japan.
The glassy veins formed at 500-550 C under lithostatic pressures, and then pressures dropped drastically. The solubility of
silica also dropped, and the quartz veins formed under hydrostatic pressures. Connections between the lithostatic and hydrostatic
pressure regimes were key to the formation of the hydrothermal breccia veins, and the granite?porphyry system provides useful
information for understanding supercritical geothermal reservoirs.