2D FEM modeling on the multi-channel transient electromagnetic method

doi:10.6038/cjg2018L0672

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院页岩气与地质工程重点实验室

	2D FEM modeling on the multi-channel transient electromagnetic method
	Wang Ruo 1,2,3; Wang MiaoYue 1,2,3; Di QingYun 1,2,3; Xue GuoQiang 1,2,3
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2018-12-01
卷号	61 期号:12 页码:5084-5095
关键词	2D FEM modeling MTEM method High and low frequency correction Isochronic curve Isochronic section
ISSN号	0001-5733
DOI	10.6038/cjg2018L0672
英文摘要	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.
WOS关键词	TIME
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000454466600032
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/90240]
专题	地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
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
推荐引用方式 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.