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物探与化探  2020, Vol. 44 Issue (3): 672-676    DOI: 10.11720/wtyht.2020.0056
     中国地质学会勘探地球物理专委会2019年会优秀论文 本期目录 | 过刊浏览 | 高级检索 |
航空瞬变电磁数据背景场去除研究
黄威1,2,3, 贲放1,2,3(), 李军峰1,2,3, 殷长春4, 胥值礼1,2,3, 刘俊杰1,2,3
1. 自然资源部 地球物理电磁法探测技术重点实验室,河北 廊坊 065000
2. 中国地质科学院 地球物理地球化学勘查研究所,河北 廊坊 065000
3. 国家现代地质勘查工程技术研究中心,河北 廊坊 065000
4. 吉林大学 地球探测科学与技术学院,吉林 长春 130026
Background field removal from airborne transient electromagnetic data
Wei HUANG1,2,3, Fang BEN1,2,3(), Jun-Feng LI1,2,3, Chang-Chun YIN4, Zhi-Li XU1,2,3, Jun-Jie LIU1,2,3
1. Laboratory of Geophysical Electromagnetic Probing Technologies, Ministry of Natural Resources, Langfang 065000, China
2. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
3. National Research Center of Geoexploration Technology, Langfang 065000, China
4. College of Geo-exploration Sciences and Technology, Jilin University, Changchun 130026, China
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摘要 

与地面瞬变电磁法相比,航空瞬变电磁法受不同的噪声类型影响较大,如天电噪声、运动噪声等,并且背景场对数据的影响也是不可忽略的。由于背景场中含有一次场信息,使得背景场幅值远大于含有地质信息的二次场信号。为较清晰地获得地下电性结构,需找到可以高效去除背景场的方法。本文提出利用线性插值方法来对背景场问题进行研究。首先,获得前、后高空飞行的测线数据,经过叠加、平均计算得到叠加周期内相同采样时间道的响应值,然后,利用插值原理针对每个采样时间道建立一个插值函数,最后,根据飞行时间来计算工区每条测线上采集数据的背景场值,从而达到去除背景场的目的。实测数据背景场去除的算例表明,该方法可较好地去除背景场对二次场异常的掩盖,去除后可较清晰地判断异常出现的位置。时间域航空电磁数据预处理包含较多处理模块,该方法的提出为高效的数据处理奠定了基础。

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黄威
贲放
李军峰
殷长春
胥值礼
刘俊杰
关键词 航空瞬变电磁法数据预处理背景场去除线性插值法    
Abstract

A comparison with ground transient electromagnetic (EM) method shows that airborne transient EM is more affected by noise, such as sefrics and motion noise. And the influence of background field noise couldn't be neglected. The background contains primary field information, which causes the amplitude of background field to be much larger than the secondary field signal containing geological information. In order to obtain the underground electrical structure clearly, it is necessary to find an efficient method to remove background field. In this paper, the background field problem is studied by linear interpolation. First, according to the responses of the front and back line obtained from the high flight, after cumulative and average calculation, the responses of the same time channel of each measured line in a cycle can be obtained as the background field responses of the corresponding time channel of each line. Using interpolation principle, the background field above each measuring line in the working area is calculated by flight time, so as to remove the background field. Through the real data removal, this method can better remove the background field and then show the anomaly, and can clearly determine the location of the anomaly after removal. Time-domain AEM data preprocessing contains many processing modules. The linear interpolation method proposed in this paper lays a foundation for efficient data preprocessing.

Key wordsairborne transient EM    data pre-processing    de-noising background filed    linear interpolation
收稿日期: 2020-01-19      出版日期: 2020-06-24
:  P631  
基金资助:国家重点研发计划项目(2017YFC0601900);基本科研业务费专项经费资助项目(JYYWF20180103);中国地质调查局项目(DD20201179);物化探所中央级公益性科研院所基本科研业务费专项资金资助项目(AS2017J06)
通讯作者: 贲放
作者简介: 黄威(1989-),女,工程师,博士,毕业于吉林大学,主要从事航空电磁正反演理论及数据处理与解释研究工作。 Email: huangwei@igge.cn
引用本文:   
黄威, 贲放, 李军峰, 殷长春, 胥值礼, 刘俊杰. 航空瞬变电磁数据背景场去除研究[J]. 物探与化探, 2020, 44(3): 672-676.
Wei HUANG, Fang BEN, Jun-Feng LI, Chang-Chun YIN, Zhi-Li XU, Jun-Jie LIU. Background field removal from airborne transient electromagnetic data. Geophysical and Geochemical Exploration, 2020, 44(3): 672-676.
链接本文:  
https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2020.0056      或      https://www.wutanyuhuatan.com/CN/Y2020/V44/I3/672
Fig.1  时间域航空电磁野外飞行示意
Fig.2  背景场线性插值示意
Fig.3  背景场去除前后效果比较
Fig.4  实测数据与背景场数据不同时间道剖面对比
Fig.5  二次场数据剖面
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