Potential supercritical geothermal resources characterised by numerical modelling of fluid flow and heat transport in the Yuzawa area, Akita, Japan

IF 3.5 2区工程技术 Q3 ENERGY & FUELS

Geothermics Pub Date : 2025-04-30 DOI:10.1016/j.geothermics.2025.103355

Koichi Yokoi , Tateyuki Negi , Shohta Shimizu , Guanhong Feng , Tianfu Xu , Norifumi Todaka

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引用次数: 0

Abstract

The Yuzawa area in Japan hosts an active geothermal field. In this study, we combined magnetotelluric (MT) resistivity measurements, microearthquake surveys, and numerical modelling of fluid flow and heat transport to constrain the potential existence of supercritical resources in the Yuzawa area. The numerical model was calibrated based on geological, geophysical, geochemical, and drilling data, and included an intrusive heat source that was spatially inferred by the MT survey. The quasi-static state model results match the observed temperatures and pressures in exploratory wells, as well as the heat source from surface manifestations. An inferred zone with supercritical temperatures forms beneath a zone of intensive silica precipitation, which coincides with the brittle–ductile transition, as mapped from microearthquake hypocentres. Preliminary production forecasts of the supercritical zone show that the fracture permeability controls the enthalpy and mass flow rate, with increasing permeability leading to a higher mass flow rate but a lower fluid enthalpy. This study contributes to a deeper understanding of the structure and characteristics of supercritical geothermal resources in the Yuzawa area.

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日本秋田汤泽地区流体流动和热输运数值模拟表征的潜在超临界地热资源

日本汤泽地区拥有一个活跃的地热田。在这项研究中，我们结合大地电磁（MT）电阻率测量、微地震测量以及流体流动和热输运的数值模拟来约束汤泽地区超临界资源的潜在存在。该数值模型是基于地质、地球物理、地球化学和钻井数据进行校准的，并包含了一个由MT调查在空间上推断出来的侵入热源。准静态模型结果与探井观测到的温度和压力以及地表表现的热源相匹配。一个推断出的超临界温度区在密集的二氧化硅沉淀区下面形成，这与微地震震源所映射的脆性-韧性转变相吻合。超临界区初步产量预测表明，裂缝渗透率控制着焓和质量流量，渗透率增大导致质量流量增大而流体焓降低。该研究有助于进一步认识汤泽地区超临界地热资源的构造和特征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geothermics 工程技术-地球科学综合

CiteScore

7.70

自引率

15.40%

发文量

237

审稿时长

4.5 months

期刊介绍： Geothermics is an international journal devoted to the research and development of geothermal energy. The International Board of Editors of Geothermics, which comprises specialists in the various aspects of geothermal resources, exploration and development, guarantees the balanced, comprehensive view of scientific and technological developments in this promising energy field. It promulgates the state of the art and science of geothermal energy, its exploration and exploitation through a regular exchange of information from all parts of the world. The journal publishes articles dealing with the theory, exploration techniques and all aspects of the utilization of geothermal resources. Geothermics serves as the scientific house, or exchange medium, through which the growing community of geothermal specialists can provide and receive information.