| 汶川地震科学钻探2号孔(WFSD-2)随钻泥浆氢和汞浓度与断裂构造关系 |
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| 引用本文： | 张彬,刘耀炜,方震,官致君,张磊,郭丽爽.汶川地震科学钻探2号孔(WFSD-2)随钻泥浆氢和汞浓度与断裂构造关系[J].地球物理学报,2018,61(5):1771-1781. |
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| 作者姓名： | 张彬 刘耀炜 方震 官致君 张磊 郭丽爽 |
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| 作者单位： | 1. 中国地震局地球物理研究所, 北京 100081;2. 中国地震局地壳应力研究所(地壳动力学重点实验室), 北京 100085;3. 安徽省地震局, 合肥 230031;4. 四川省地震局, 成都 610041 |
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| 基金项目： | 中央级公益性科研院所基本科研业务专项（ZDJ2016-09，ZDJ2017-27），国家科技支撑项目"汶川地震断裂带科学钻探"（WFSD-10），国家自然科学基金（41404036）和地震科技星火计划（XH18021Y）联合资助. |
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| 摘 要： | 以WFSD-2钻孔为研究对象，分析了随钻泥浆氢（H2）和汞（Hg）浓度特征，在垂向上存在显著不均匀性，出现多段浓度异常高值.研究表明：（1） H2和Hg浓度异常与次级断裂和岩石构造性质有较大关系，以断裂带或破碎带为通道运移而产生高值异常；（2）随钻泥浆H2和Hg浓度特征暗示了汶川地震WFSD-2孔中主滑移带位置，表明随钻流体特征是识别地下裂隙带、破碎带或断裂带的途径之一；（3） H2和Hg浓度异常还可能与构造块体边界强震活动和断裂带近场中等地震活动有关.本文研究结果为分析大震过程中深部流体活动行为提供了H2和Hg地球化学特征依据，对地震前兆机理研究也具有重要的参考价值.
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| 关 键 词： | 汶川地震 科学钻探 映秀—北川断裂带 氢气 汞 |
| 收稿时间： | 2018-03-06 |
Relationship between concentrations of hydrogen and mercury of No.2 hole cores at the Wenchuan Earthquake Scientific Drilling and fault zone structure |
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| ZHANG Bin,LIU YaoWei,FANG Zhen,GUAN ZhiJun,ZHANG Lei,GUO LiShuang.Relationship between concentrations of hydrogen and mercury of No.2 hole cores at the Wenchuan Earthquake Scientific Drilling and fault zone structure[J].Chinese Journal of Geophysics,2018,61(5):1771-1781. |
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| Authors: | ZHANG Bin LIU YaoWei FANG Zhen GUAN ZhiJun ZHANG Lei GUO LiShuang |
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| Institution: | 1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;2. Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;3. Anhui Earthquake Administration, Hefei 230031, China;4. Sichuan Earthquake Administration, Chengdu 610041, China |
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| Abstract: | Taking the WFSD-2 drill hole as the research object, we analyzed the characteristics of hydrogen (H2) and mercury (Hg) concentrations in the drilling mud. In the vertical direction, there was significant non-uniformity, and there were multiple sections of abnormally high values. The research shows that (1) the abnormal concentrations of H2 and Hg have a notable relationship with secondary faults and the properties of rock structure, and high-value anomalies are caused by the channel migration of fault zones or fractured zones. (2) The characteristics of H2 and Hg concentrations in the mud collected while drilling indicate the position of the main slip zone in the WFSD-2 drilling of the Wenchuan earthquake, implying that the study on the characteristics of the mud fluid collected while drilling is one of the approaches to identify underground fissure zones, fractured zones or fault zones. (3) Abnormal concentrations of H2 and Hg may also be related to strong seismic activity at the boundary of the tectonic block and moderate seismic activity in the near-field of the fault zone. The results of this study provide evidence on geochemical characteristics of H2 and Hg for the analysis of deep fluid activity during large earthquakes, and also serve as an important reference for the study on the mechanism of earthquake precursors. |
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| Keywords: | Wenchuan earthquake Scientific Drilling Yingxiu-Beichuan fault zone Hydrogen Mercury |
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