| 基于美国国家地热数据的地热温度计案例分析与方法适宜性评价 |
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| 引用本文： | 蒋 恕,陈国辉,张钰莹,张鲁川,旷 健,李 醇,程万强.基于美国国家地热数据的地热温度计案例分析与方法适宜性评价[J].高校地质学报,2021,27(1):1-17. |
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| 作者姓名： | 蒋 恕 陈国辉 张钰莹 张鲁川 旷 健 李 醇 程万强 |
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| 作者单位： | 中国地质大学资源学院,武汉 430074;中国地质大学构造与油气资源教育部重点实验室,武汉 430074;中国地质大学生物地质与环境地质国家重点实验室,武汉 430074;中国电建集团华东勘测设计研究院有限公司,杭州 311122 |
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| 基金项目： | 国家自然科学基金项目(41728004,41972144);中国电建华东勘测设计研究院基金项目(KY2018-KC-01)联合资助。 |
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| 摘 要： | 热储温度评价是地热系统研究的关键内容。文章选取建设比较成熟的美国国家地热数据系统(National Geothermal Data System,NGDS),分别利用地球化学地热温度计、多矿物平衡法、冷热水混合模型及气体地热温度计对不同地热田的热储温度进行评价,确定不同热储温度评价方法的适用性和局限性,以期为热储温度评价方法的选取提供参考。研究结果表明,当地热水体达到离子和矿物的平衡状态时,地球化学地热温度计可得到相对合理的热储温度;当地热水体未达到离子和矿物的平衡状态时,SiO2地热温度计较阳离子温度对热储温度的评价效果更准确。尽管基于饱和指数的多矿物平衡法由于有限饱和平衡矿物选择导致不一定得到精确的热储温度,但可为地球化学地热温度计的选取提供依据,比如当石英过饱和时,用玉髓地热温度计计算的温度比石英更能反映地下的热储温度。对于蒸汽为主的高温地热储层,由于蒸汽和地表岩石反应导致矿物和离子无法反映热储信息,气体地热温度计对该类型热储温度的评价更加合理。由于混合模型得到的是冷、热水混合之前的热水端温度,因此,混合模型计算的热储温度通常高于地球化学地热温度计。总之,没有一种温度计是万能的,不同地热温度计适用条件不同,综合不同合理的方法以及互相校正是最好的方法。
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| 关 键 词： | 热储温度 美国国家地热数据系统(NGDS) 地球化学地热温度计 多矿物平衡法 混合模型 |
Recent Advancement in Methods of Estimating Geothermal ReservoirTemperature: A U.S. National Geothermal Data System-based Study |
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| JIANG Shu,CHEN Guohui,ZHANG Yuying,ZHANG Luchuan,KUANG Jian,LI Chun,CHENG Wanqiang.Recent Advancement in Methods of Estimating Geothermal ReservoirTemperature: A U.S. National Geothermal Data System-based Study[J].Geological Journal of China Universities,2021,27(1):1-17. |
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| Authors: | JIANG Shu CHEN Guohui ZHANG Yuying ZHANG Luchuan KUANG Jian LI Chun CHENG Wanqiang |
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| Institution: | 1. School of Earth Resources, China University of Geosciences, Wuhan 430074, China;
2. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China;
3. State Key Laboratory of biological geology and environmental geology, China University of Geosciences, Wuhan 430074, China;
4. PowerChina Huadong Engineering Corp Ltd, Hangzhou 311122, China; |
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| Abstract: | Estimation of geothermal reservoir temperature plays a key role in the geothermal system research. This study employs geothermometers of geochemistry, mineral equilibria, mixing model with cold meteoric water, and gas to evaluate the reservoir
temperature of different geothermal fields with data archived in the National Geothermal Data System (NGDS), which concludes the
limitations of applications of different methods for determining the reservoir temperature and provides benchmarks for choosing the
appropriate methods to calculate the geothermal reservoir temperature. The results reveal that: 1) The geochemical geothermometer
method is reliable when the geothermal fluids reach the equilibrium between ions and minerals; the SiO2 (silica) geothermometer is more reliable than the cation geothermometer when the geothermal fluids have not reached the equilibrium; 2) The saturation index of the mineral equilibria can provide benchmarks choosing the geothermometers even if it cannot calculate the accurate reservoir temperature due to the selection of limited saturated minerals. For example, the chalcedony geothermometer is better than SiO2 geothermometer to estimate the reservoir temperature of due to the oversaturation of silica based on the multi-mineral equilibrium plot. For the vapordominated high temperature geothermal reservoirs, the minerals and ions cannot reflect the properties of geothermal reservoir, and the gas thermometer will be more successful in predicting the subsurface temperature in high-temperature geothermal systems. The mixing models usually overestimate the reservoir temperature since they pick up the temperature before the hot water gets mixed with the cold water. There is no universal geothermometer since each method has its own assumptions and works for specific geothermal setting. The best approach is to employ various suitable geothermometers and validate the results. |
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| Keywords: | reservoir temperature national geothermal data system (NGDS) geochemical geothermometer multi-minerals equilibrium mixing model
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