沉积盆地型与隆起山地型地热系统地表地球化学异常模式差异性分析
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本文为国家重点研发计划课题(编号:2019YFC0604902)和国家自然科学基金资助项目(编号:41872126、U2003101)的成果


Analysis of the differences of surface geochemical anomaly patterns between the sedimentary basin type geothermal system and the rifted mountain type geothermal system
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    摘要:

    地球化学勘探技术作为地热资源综合勘查技术之一,在地热勘探开发中发挥了重要作用。沉积盆地型与隆起山地型地热系统由于自身地质特征的不同,必然造成它们的地球化学判识指标和异常模式存在差异。目前国内外尚缺乏对这两种类型地热系统判识指标和地球化学异常模式差异性进行地质地球化学分析,导致针对不同的勘探对象在方法选择和异常解释上依据不足。以典型沉积盆地型地热系统——河北雄县地热系统,隆起山地型地热系统——安徽巢湖半汤地热系统为例,开展地球化学方法试验,建立了两种类型地热系统的地表地球化学异常模式,并从地热系统的地质因素(热源、热水、热储、通道、盖层)出发,对其地表地球化学异常模式差异性进行分析,表明隆起山地型地热系统地表地球化学异常模式为受导水断层、破碎带控制的正异常;沉积盆地型地热系统气体地球化学异常模式为受热储构造控制的正异常,微量元素地球化学异常为受氧化还原环境控制的负异常;二者在有效地球化学指标组合和异常形态上均存在差异。研究结果为不同类型地热系统勘探提供方法和理论依据。

    Abstract:

    The differences of geochemical indicators and patterns between sedimentary basin type geothermal system and rifted mountain type geothermal system have been lacked geological—geochemical comparison and analysis, which leads to a lack of basis in method selection and anomaly interpretation for different exploration targets. The geochemical methods test was carried out in order to establish the surface geochemical anomaly patterns of the two types of geothermal systems. Methods: We take typical sedimentary basin geothermal system ——Xiongxian geothermal system, rifted mountain type geothermal system —— Bantang geothermal system as examples, apply eight geochemical methods to conduct tests over the two geothermal systems, including soil gas, headspace gas , thermally- released mercury, adsorbed hydrocarbon, carbonate, soil gas mercury, soil gas radon, soil elements. The effective geochemical indicators were optimized based on the most favorable heat zone of the thermal reservoirs in response. The differences of surface geochemical anomaly patterns between the two types of geothermal systems was analyzed based on the geological factors. Results:It shows that surface geochemical anomaly patern of the rifted mountain type geothermal system is positive anomaly controlled by the water transmitting fault and fracture zonel; gas geochemical anomaly pattern of sedimentary basin type geothermal system is positive anomaly controlled by hot water reservoir structure, and geochemical anomaly pattern of the trace elements are negative anomaly controlled by REDOX environment. The effective geochemical indicators and abnormal morphology are different between the two type of geothermal systems.Conclusions: There are great differences between sedimentary basin type geothermal system and rifted mountain type geothermal system in terms of the effective geochemical identification indicators and geochemical anomaly patterns of the most favorable heat zones, which are closely related to geological factors such as heat source, hot water, thermal reservoir, migration channel, caprock of geothermal system. The results in this study is significant for prospecting for the most favorable heat zones of different types of geothermal systems.

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王国建,宁丽荣,李广之,吴传芝,朱怀平,胡斌,肖鹏飞,唐俊红.2021.沉积盆地型与隆起山地型地热系统地表地球化学异常模式差异性分析[J].地质论评,67(1):117-127,[DOI].
WANG Guojian, NING Lirong, LI Guangzhi, WU Chuanzhi, ZHU Huaiping, HU Bin, XIAO Pengfei, TANG Junhong.2021. Analysis of the differences of surface geochemical anomaly patterns between the sedimentary basin type geothermal system and the rifted mountain type geothermal system[J]. Geological Review,67(1):117-127.

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  • 收稿日期:2020-04-16
  • 最后修改日期:2020-11-24
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  • 在线发布日期: 2021-01-19
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