Estimation of Spatial Distribution and Fluid Fraction of a Potential Supercritical Geothermal Reservoir by Magnetotelluric Data: A Case Study From Yuzawa Geothermal Field, NE Japan
Estimation of Spatial Distribution and Fluid Fraction of a Potential Supercritical Geothermal Reservoir by Magnetotelluric Data: A Case Study From Yuzawa Geothermal Field, NE Japan
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DOI：
10.1029/2021jb022911
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发表时间：
2021-08
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影响因子：
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通讯作者：
K. Ishizu;Y. Ogawa;Keishi Nunohara;N. Tsuchiya;M. Ichiki;H. Hase;W. Kanda;S. Sakanaka;Y. Honkura;Y. Hino;K. Seki;Kuo Hsuan Tseng;Y. Yamaya;T. Mogi
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作者：
K. Ishizu;Y. Ogawa;Keishi Nunohara;N. Tsuchiya;M. Ichiki;H. Hase;W. Kanda;S. Sakanaka;Y. Honkura;Y. Hino;K. Seki;Kuo Hsuan Tseng;Y. Yamaya;T. Mogi
地壳内的流体可能存在于超临界条件下（即，纯水 >374°C 和 >22.1 MPa）。日本东北部 (NE) 地表以下 2-10 公里深处的超临界地热储层主要由分异结晶过程中从熔体中溶出的岩浆流体组成。超临界地热储层作为下一代地热资源而受到关注，因为与在地表以下 2.5-6.0 km 深度、尺寸为 3 km（宽）× 5 km（长）、尺寸为 3 km（宽）× 5 km（长）的常规地热储层相比，超临界地热储层可提供更多的能量。估计储层的流体比例为 0.1%–4.2%，盐度值为 5–10 wt%。熔体也在储层下方成像，并且基于电阻率模型；我们开发了一种超临界地热储层演化的机制，其中从熔体供应的上涌超临界流体被捕获在渗透性较低的二氧化硅密封下并在那里积聚。
Fluids within the Earth's crust may exist under supercritical conditions (i.e., >374°C and >22.1 MPa for pure water). Supercritical geothermal reservoirs at depths of 2–10 km below the surface in northeastern (NE) Japan mainly consist of magmatic fluids that exsolved from the melt during the course of fractional crystallization. Supercritical geothermal reservoirs have received attention as next‐generation geothermal resources because they can offer significantly more energy than that obtained from conventional geothermal reservoirs found at temperatures 400°C) with dimensions of 3 km (width) × 5 km (length) at a depth of 2.5–6.0 km below the surface. The estimated fluid fraction of the reservoir is 0.1%–4.2% with salinity values of 5–10 wt%. The melt is also imaged below the reservoir, and based on the resistivity model; we develop a mechanism for the evolution of the supercritical geothermal reservoir, wherein upwelling supercritical fluids supplied from the melt are trapped under less permeable silica sealing and accumulate there.