IGGCAS OpenIR  > 页岩气与地质工程院重点实验室
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
AbstractThe 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.
Keyword2D FEM modeling MTEM method High and low frequency correction Isochronic curve Isochronic section
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000454466600032
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Document Type期刊论文
Corresponding AuthorWang Ruo
Affiliation1.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
Recommended Citation
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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