|Table of Contents|

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

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

Issue:
2020年第06期
Page:
731-736
Research Field:
电磁法勘探专辑
Publishing date:

Info

Title:
Relationship Between the Detection Capability and Offset of Transient Electromagnetic Method for Thin Layers
Author(s):
LEI Kang-xin123 XUE Guo-qiang1234* CHEN Wei-ying123 ZHOU Nan-nan123
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
Keywords:
transient electromagnetic method grounded-wire source thin layer detection forward modeling detection capability the biggest relative anomaly offset observation time
PACS:
P631
DOI:
10.19814/j.jese.2020.07044
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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Last Update: 2020-12-20