中国川西高原咸水河断裂带地热水的分布与成因:断裂系统和区域地震活动的制约因素

IF 3.5 2区 工程技术 Q3 ENERGY & FUELS Geothermics Pub Date : 2024-09-11 DOI:10.1016/j.geothermics.2024.103150
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引用次数: 0

摘要

咸水河断裂带(XSFZ)构造活动强烈、地震频繁、温泉众多,具有开发地热资源的巨大潜力。以往的研究主要集中于 XSFZ 东南段的某些热液系统,如康定热液系统,但缺乏对 XSFZ 沿线地热水的综合比较和系统分析。根据详细的地质调查,XSFZ 热液系统划分为六个地热活动区:泸火(LH)、道孚(DF)、黔宁-八美(QB)、雅拉河-中谷(YZ)、康定(KD)和磨西(MX)。根据 87Sr/86Sr 比值和元素在水岩相互作用中的表现,硅酸盐矿物的溶解是地热水水文地质化学成分的主要来源。δD和δ18O成分表明,地热水主要来源于流星水,但也受到深层流体的影响。不过,深层流体对 Cl- 浓度较高的东南部地热区(YZ、KD 和 MX)的贡献大于西北部地热区(LH、DF 和 QB)。储层温度和氯-焓模型显示,XSFZ沿线有三个不同的地热系统:YZ和KD地热水源于一个共同的深储层(R1),MX源于R3,LH、DF和QB源于R4。由于 XSFZ 沿线热结构分布不均,东南段产生较强的热应力,地震发生较频繁。因此,对 XSFZ 沿线地热水的研究可以为该地区深部构造活动和地震监测的地球化学指标提供有价值的见解。
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Distribution and genesis of geothermal waters in the Xianshuihe fault zone, Western Sichuan plateau, China: Constraints on fracture system and regional seismic activities

The Xianshuihe fault zone (XSFZ), which is characterized by intense tectonic activities, frequent earthquakes and great number of hot springs, has significant potential for exploiting geothermal resources. Previous studies primarily focus on certain hydrothermal systems in southeastern segment of XSFZ, such as Kangding hydrothermal system, but lack the synthetical comparison and systematic analysis of geothermal waters along the XSFZ. Based on detailed geological investigation, the XSFZ hydrothermal system has divided into six geothermal activity areas: Luhuo (LH), Daofu (DF), Qianning-Bamei (QB), Yalahe-Zhonggu (YZ), Kangding (KD) and Moxi (MX). According to the 87Sr/86Sr ratios and elements behaving in water-rock interactions, the dissolution of silicate minerals is the primarily source of the hydrogeochemical compositions in geothermal waters. The δD and δ18O composition indicate that geothermal waters primarily originated from meteoric waters, but also affected by deep fluids. However, the contribution of deep fluids to the southeastern geothermal areas (YZ, KD and MX) with high concentrations of Cl- is greater than that of the northwestern (LH, DF and QB). The reservoir temperatures and chlorine-enthalpy model reveal that there are three distinct geothermal systems along the XSFZ: YZ and KD geothermal waters are originated from a common deep reservoir (R1), MX are from R3, and LH, DF, and QB are from R4. Due to the uneven thermal structural distribution along XSFZ, the southeastern segments generated stronger thermal stress and have more frequent earthquake occurrence. Thus, the study of geothermal waters along XSFZ can provide valuable insights into deep tectonic activities and geochemical indicators of earthquake monitoring in the region.

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来源期刊
Geothermics
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.
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