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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
发表期刊CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
卷号61期号:10页码:4148-4159
摘要Artificial 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.
关键词Newton iteration method GA method Near-field effect CSAMT
DOI10.6038/cjg2018L0224
关键词[WOS]APPARENT RESISTIVITY ; INVERSION
语种英语
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000447958300020
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/132A11/89178
专题页岩气与地质工程院重点实验室
通讯作者Di QingYun
作者单位1.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
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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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