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《Chinese Journal of Geophysics》 2018-02
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Removing airwave effects using electromagnetic fields decomposition for 3D MCSEM

WANG ShuMing;DI QingYun;WANG Ruo;SU XiaoLu;Mohamed A;Hubei Subsurface Multi-scale Imaging Key Laboratory,Institute of Geophysics and Geomatics,China University of Geosciences;Institute of Geology and Geophysics,Chinese Academy of Sciences;  
For marine controlled source electromagnetic(MCSEM)prospecting,it′s necessary for us to remove airwave effects when the data are processed and interpreted,and electromagnetic upgoing and down-going parts decomposition is a kind of effective technology.In order to quickly and efficiently implement such method,supposing that electromagnetic fields vary slowly along horizontal direction,this paper deduced a new method that only uses horizontal gradient of electromagnetic fields to decompose electromagnetic fields based on Maxwell′s equations.The decomposition effects were verified by MCSEM modeling tests which indicates that we can obtain stable and reliable results using the new method,meanwhile demonstrates that the new method is also a kind of qualitative interpretation technology for MCSEM.
【Fund】: 国家自然科学基金(41574067);极低频探地工程地下资源探测分系统;; 国家高科技研究发展计划(863)(2012AA09A404)资助
【CateGory Index】: P631.325
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