IGGCAS OpenIR  > 页岩气与地质工程院重点实验室
Near-field correction of CSAMT data based on Newton iteration method and GA method
Luan XiaoDong1,2,3; Di QingYun1,2; Lei Da1,2
2018-10-01
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
Volume61Issue:10Pages:4148-4159
AbstractArtificial source used in CSAMT studies has greatly enhanced the high frequency signal of the audio frequency bandwidth used in subsurface prospecting. On the other hand, it causes non-planar wave, known as near-field effect in CSAMT Cagniard apparent resistivity sounding curves. This is observed as a 45 inclination in low-frequency zone on bi-logarithmic plot of subsurface apparent resistivity. Hence, a method to correct for the CSAMT near-field effect based on Newton iteration method was first established. First, we derived an equation to calculate apparent resistivity from CSAMT data and solved it using Newton method to obtain corrected apparent resistivity. The accuracy of this method was validated using two-layer and three-layer theoretical models. In order to suppress both near-field effect and noise in data concurrently, we further introduced genetic algorithm (GA) inversion to the correction of CSAMT near-field by proposing an adaptive regularization factor to minimize the objective function, which is composed of whole-frequency error and model parameter gradient. The GA method was tested with a noisy data for effective removal of the near-field effect and suppression of noise in the data. When applied to real CSAMT data from Inner Mongolia, Newton iteration method and GA method were able to correct near-field effect effectively, thus displaying the accurate subsurface geo-electric structure.
KeywordNewton iteration method GA method Near-field effect CSAMT
DOI10.6038/cjg2018L0224
WOS KeywordAPPARENT RESISTIVITY ; INVERSION
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000447958300020
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/89178
Collection页岩气与地质工程院重点实验室
Corresponding AuthorDi QingYun
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Luan XiaoDong,Di QingYun,Lei Da. Near-field correction of CSAMT data based on Newton iteration method and GA method[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2018,61(10):4148-4159.
APA Luan XiaoDong,Di QingYun,&Lei Da.(2018).Near-field correction of CSAMT data based on Newton iteration method and GA method.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,61(10),4148-4159.
MLA Luan XiaoDong,et al."Near-field correction of CSAMT data based on Newton iteration method and GA method".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 61.10(2018):4148-4159.
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