中心回线TEM法探测多层积水采空区的可行性

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Bibliographic Details
Published in应用地球物理：英文版 Vol. 13; no. 4; pp. 587 - 597
Main Author 闫述 薛国强 邱卫忠 李海 钟华森
Format Journal Article
LanguageEnglish
Published 2016
Subjects
中心回线TEM法
低阻屏蔽层
可分辨标准
多层积水采空区探测
数值与理论分析
观测时长
观测误差
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Bibliography:central loop TEM method, prospecting multilayer water-filled goaf, conductive shielding layer, numerical and theoretical analysis, length of observation time, observation error, distinguishable criterion
With deep mining of coal mines, prospecting multilayer water-filled goaf has become a new content that results from geophysical exploration in coalfields. The central loop transient electromagnetic （TEM） method is favorable for prospecting conductive layers because of the coupling relationship between its field structure and formation. However, the shielding effect of conductive overburden would not only require a longer observation time when prospecting the same depth but also weaken the anomalous response of underlying layers. Through direct time domain numerical simulation and horizontal layered earth forward modeling, this paper estimates the length of observation time required to prospect the target, and the distinguishable criterion of multilayer water-filled goal is presented with observation error according to the effect of noise on observation data. The observed emf curves from Dazigou Coal Mine, Shanxi Province can distinguish multilayer water-filled goaf. In quantitative inversion interpretation of observed curves, using electric logging data as initial parameters restrains the equivalence caused by coal formation thin layers. The deduced three-layer and two-layer water-filled goals are confirmed by the drilling hole. The result suggests that when observation time is long enough and with the anomalous situation of underlying layers being greater than the observation error, the use of the central loop TEM method to orosoect a multilaver water-filled goaf is feasible.
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Yan Shu1, Xue Gou-Qiang2, Qiu Wei-Zhong3, Li Hai2, and Zhong Hua-Sen2 （1. School of Computer Science and Communication Engineering, Jiangsu University, Zhenjiang 212013, China; 2. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;3. Shanxi Coal Geological Exploration Institute 115, Datong 037003, China）
ISSN:1672-7975
1993-0658