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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第42卷

期数:

2020年第06期

页码:

731-736

栏目:

电磁法勘探专辑

出版日期:

2020-11-15

文章信息/Info

Title:

Relationship Between the Detection Capability and Offset of Transient Electromagnetic Method for Thin Layers

文章编号:

1672-6561(2020)06-0731-06

作者:

雷康信¹; 2; 3; 薛国强¹; 2; 3; 4*; 陈卫营¹; 2; 3; 周楠楠¹; 2; 3

1. 中国科学院地质与地球物理研究所 中国科学院矿产资源研究重点实验室,北京 100029; 2. 中国科学院大学 地球与行星科学学院,北京 100049; 3. 中国科学院地球科学研究院,北京 100029; 4. 长安大学 地球物理场多参数综合模拟实验室(中国地球物理学会重点实验室),陕西 西安 710054

Author(s):

LEI Kang-xin¹; 2; 3;  XUE Guo-qiang¹; 2; 3; 4*;  CHEN Wei-ying¹; 2; 3;  ZHOU Nan-nan¹; 2; 3

1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 3. Innovation Academy of Earth Science, Chinese Academy of Sciences, Beijing 100029, China; 4. Integrated Geophysical Simulation Lab(Key Laboratory of Chinese Geophysical Society), Chang'an University, Xi'an 710054, Shaanxi, China

关键词:

瞬变电磁法;  电性源;  薄层探测;  正演模拟;  分辨能力;  最大相对异常;  偏移距;  观测时间

Keywords:

transient electromagnetic method;  grounded-wire source;  thin layer detection;  forward modeling;  detection capability;  the biggest relative anomaly;  offset;  observation time

分类号:

P631

DOI:

10.19814/j.jese.2020.07044

文献标志码:

A

摘要:

薄层探测问题一直是地球物理勘探关注的重点,以往的研究大多关注的是不同地球物理方法对薄层的探测效果,却没有关注观测参数对探测结果的影响。拟选用电性源瞬变电磁法,以一维正演理论为基础,通过定义相对异常表征分辨能力,研究偏移距、观测时间与分辨能力之间的关系,从而决定如何选择合适的观测参数以实现薄层异常的快速有效勘探。结果表明:瞬变电磁法对薄层的分辨能力随着偏移距的增大先呈线性递减后逐步趋于稳定,同时所需的观测时间也逐渐增大; 分辨能力的衰减速率随着电阻率及埋藏深度的增大逐渐减弱。综上所述,采用较小的偏移距进行数据采集,不仅有利于提高勘探精度,也能相应地提升勘探效率。

Abstract:

The detection of thin layers has always been paid a lot of attention in geophysical prospecting, but previous researches mainly focus on the detection results of different geophysical methods while ignoring the influence of the observation parameters. The grounded-wire transient electromagnetic method(TEM)was chosen to the thin layer detection, and the relationship between offset, observation time and detection capability was analyzed based on the 1D forward modeling and the defined relative anomaly, which was used to reflect the detection capability of the TEM for thin layers. Hence, the way on how to choose proper observation parameters for fast and fine detection of thin layers was given. The results show that detection capability of transient electromagnetic method for thin layers becomes decreased linearly and then gradually tends to be stable with the increase of the offset, at the same time, the demanded observation time becomes longer, which is bad for actual field measurement. Besides, the decrease speed of detection capability becomes slower with the increasing of resistivity or buried depth. Therefore, it is concluded that adopting short offset in data collecting not only can improve the detection accuracy, but also can improve the detection efficiency.

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　XUE Guo-qiang,YAN Shu,DI Qing-yun,et al.Technical Analysis of Multi-transient Electromagnetic Method[J].Journal of Earth Sciences and Environment,2015,37(06):94.
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备注/Memo

备注/Memo:

收稿日期:2020-07-29; 修回日期:2020-10-11; 网络首发日期:2020-11-10投稿网址:http:∥jese.chd.edu.cn/
基金项目:中国科学院科研仪器设备研制项目(YJKYYQ20190004); 自然资源部煤炭资源勘查与综合利用重点实验室开放项目(KF2020-3); 国家自然科学基金项目(41704076)
作者简介:雷康信(1996-),男,山西平遥人,中国科学院大学理学博士研究生,E-mail:lkx18@mail.iggcas.ac.cn。
*通讯作者:薛国强(1966-),男,山西运城人,中国科学院地质与地球物理研究所研究员,博士研究生导师,理学博士, E-mail:ppxueguoqiang@163.com。

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更新日期/Last Update: 2020-12-20