| 利用分布式光纤声传感设备开展青藏高原易贡湖浅层结构探测 |
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| 引用本文： | 张衡,徐团伟,裴顺平,赵俊猛.利用分布式光纤声传感设备开展青藏高原易贡湖浅层结构探测[J].地学前缘,2021,28(6):227-234. |
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| 作者姓名： | 张衡 徐团伟 裴顺平 赵俊猛 |
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| 作者单位： | 1.中国科学院 青藏高原研究所 青藏高原地球系统与资源环境国家重点实验室, 北京 100101;2.中国科学院 半导体研究所 传感技术国家重点实验室, 北京 100083;3.中国科学院大学 材料科学与光电技术学院, 北京 100089 |
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| 基金项目： | 中国科学院科研仪器设备研制项目(YJKYYQ20190075); 中国科学院青年创新促进会(2018097); 国家自然科学基金项目(61775210,61875184,41776201,41974109); 中国科学院青藏高原不同地块的隆升过程与动力学机制(Y9Jq078001); 中国科学院战略先导项目(XDC02040500, XDA22040105); 三亚崖州湾科技城重大项目(SKJC-2020-01-009) |
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| 摘 要： | 地震数据是利用地震学方法探测地下结构的基础条件,然而传统地震仪器难以获得极端环境地区(水下、高原等)的长时间、高密度连续数据。较之国际仪器厂商,国内的DAS研制相对较晚。自2016年起,国产DAS逐步应用于石油测井和城市区域地下结构探测,而运用在极端环境下的探测工作尚未见报道。中国科学院半导体研究所与青藏高原研究所经过多年合作研究,于2021年4月将自主研发的DAS系统首次应用于青藏高原的野外数据采集。本次试验同时记录了地面和水下的连续背景噪声和重锤数据。该研究利用背景噪声成像技术,获得了西藏易贡湖地区地表70 m以内的横波速度结构。本次研究为极端环境下的低成本、高密度数据采集和地下结构探测提供了理论和试验依据。
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| 关 键 词： | 光纤地震仪 青藏高原 易贡湖 背景噪声成像 浅层结构 |
| 收稿时间： | 2021-10-25 |
Application of distributed acoustic sensing in structural investigation of Lake Yigong in Tibet |
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| ZHANG Heng,XU Tuanwei,PEI Shunping,ZHAO Junmeng.Application of distributed acoustic sensing in structural investigation of Lake Yigong in Tibet[J].Earth Science Frontiers,2021,28(6):227-234. |
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| Authors: | ZHANG Heng XU Tuanwei PEI Shunping ZHAO Junmeng |
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| Institution: | 1. State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;2. State Key Laboratory of Transducer Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;3. College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100089, China |
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| Abstract: | Seismic data are essential for seismological detection of underground structures. However, it is difficult to obtain long-term, high-density continuous seismic data using traditional instruments in extreme environments such as underwater or a plateau. Compared with instrument manufacturers abroad, the development of DAS in China is relatively late. Since 2016, domestic DAS has been gradually applied to petroleum logging and underground structure detection in urban areas. However, there is much less DAS application in extremely harsh environments. After years of collaboration among the Institute of Semiconductors, Chinese Academy of Sciences (CAS) and Institute of Tibetan Plateau Research, scientists from CAS deployed the self-developed DAS in April 2021 for collecting field data in the Tibetan Plateau. During testing, an armored optical cable (deployed both in the water and above ground) was used to record continuous ambient noise data and active source signals. In this study, the ambient noise tomography was applied to DAS data, and a near-surface (less than 70 m deep) S-wave velocity structure along a two-dimensional survey line was obtained in the Yigong Lake in southeastern Tibetan Plateau. This study provided both theoretical and experimental evidence for high-density data collection and underground structure detection in harsh environments. |
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| Keywords: | distributed acoustic sensing Tibetan Plateau Yigong Lake ambient noise tomography near-surface structure |
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