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2D FEM modeling on the multi-channel transient electromagnetic method
Wang Ruo1,2,3; Wang MiaoYue1,2,3; Di QingYun1,2,3; Xue GuoQiang1,2,3
2018-12-01
发表期刊CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
卷号61期号:12页码:5084-5095
摘要The impulse response is studied using 2D finite element method because it is a basis for data interpretation of the multi-channel transient EM method (MTEM). In practice, the impulse response is obtained through eosin transformation from the results in the frequency domain, which are calculated by 2D finite element method (FEM) successfully used in the CSAMT modeling. However, the frequency band used in MTEM is wider than in CSAMT, and the modeling results at higher and lower frequencies deviate from the analytic results. We correct the differences by using far field and near field analytic formulas, and the correction results can be used in the cosin transformation to get the impulse response. In order to test the effect of the MTEM method, we design a three-layer model with a horizontal ore body limited-extending along the strata in the second layer. If one source is used, both in the frequency and time domain, the anomaly caused by the ore body cannot be distinguished clearly except for taking away the background field. However, the background is unknown in the field work; so it is not workable to be take away from the total field. We propose to use the isochronic curve or isochronic section of same offset to show the modeling results. In fact, from the two kinds of figures, not only the anomaly but also the horizontal location of the ore body can be distinguished clearly. It indicates that the MTEM method can distinguish the anomaly more clearly than the frequency method for in-layer deposits buried at some depth.
关键词2D FEM modeling MTEM method High and low frequency correction Isochronic curve Isochronic section
DOI10.6038/cjg2018L0672
关键词[WOS]TIME
语种英语
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000454466600032
出版者SCIENCE PRESS
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/90240
专题页岩气与地质工程院重点实验室
通讯作者Wang Ruo
作者单位1.Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
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GB/T 7714
Wang Ruo,Wang MiaoYue,Di QingYun,et al. 2D FEM modeling on the multi-channel transient electromagnetic method[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2018,61(12):5084-5095.
APA Wang Ruo,Wang MiaoYue,Di QingYun,&Xue GuoQiang.(2018).2D FEM modeling on the multi-channel transient electromagnetic method.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,61(12),5084-5095.
MLA Wang Ruo,et al."2D FEM modeling on the multi-channel transient electromagnetic method".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 61.12(2018):5084-5095.
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