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Quasi wave equation migration of transient electromagnetic field

Chen Benchi; Li Jinming and Zhou Fengtong; (P.O.Box 902,No.20 College Street,Beijing City,100083)  
A new migration method for transient electromagnetic field is recommended here. The method is applicable to low-frequency electromagnetic field that is expressed by diffusion equation. In terms of this method, the low-frequency electromagnetic field is converted, using integral transform, into a wave field expressed by wave equation; then, geometric parameters of medium are estimated by using seismic migration technique. For a 2-D geoelectric model with source, the solution equations of converted wave field are deduced, which correspond to those of transient electromagnetic field. By using finite difference reverse-time depth migration,the migration processing of 2-D transient electromagnetic field with source is successfully finished to produce clear migrated section that coincides with theoretical model.
【Fund】: 地质行业科学基金!959617
【CateGory Index】: P631.4
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