3-D resistivity imaging of the supercritical geothermal system in the Sengan geothermal region, NE Japan

3-D resistivity imaging of the supercritical geothermal system in the Sengan geothermal region, NE Japan
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日本东北部仙岩地热区超临界地热系统的 3D 电阻率成像

DOI:
10.1016/j.geothermics.2022.102412
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发表时间:
2022
期刊:
影响因子:
3.9
通讯作者:
T.
T.
中科院分区:
工程技术2区
文献类型:
--
作者:
Yamaya;Y.;Suzuki;Y.;Murata;Y.;Okamoto;K.;Watanabe;N.;Asanuma;H.;Hase;H.;Ogawa;Y.;Mogi;T.;Ishizu;K.;Uchida;T.

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A wideband magnetotelluric survey was performed in the Sengan geothermal region of northeastern Japan. A conductor with resistivity of < 30 Ωm was found at an elevation of -1.8 km in the Quaternary Kakkonda granite. Microseismic activity was not observed in the conductor, suggesting a ductile zone with temperatures exceeding 370 °C. Under these conditions, H2O-NaCl fluids can exist as two-phase or single-phase types. The permeability of the upper reservoir surface is between 3.0E-17 and 5.0E-15 m2, indicative of an exploitable supercritical geothermal reservoir. Our results indicate that this is originated by heat and fluid supply system from magma.
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