Electromagnetic Theoretical Wave-field High-distinguish Imaging Technology Research

The study about wave-field transform in electromagnetic sounding is the advanced subject in the field.Along with the development of the transient electromagnetic method,we pay more attention in wave-field transform,pseudo- seismic interpretation,electronmagnetic migration imaging and the combination method of migration and inversion.By a long-term research,Now the methods above have obtained the important development.According to the method we have developed and enriched transient electromagnetic field connotation from one side of the wave-field,can obtain the more advantageous information to underground target, body imaging,which can not be got from the conventional transient electromagnetic method.In this article,we have founded the coincidence relation between time-domain transient electromagnetic respinse and pseudo-time based on the large loop source according to the Maxwell functions. discussed ill-posed problem of the first calculator function in wave-field transform functions from one side of the mathematics. According to the former study, we have introduced an optimized calculation method of wave-field transform from the transient electromagnetic field into pseudo-seismic field. During wave-field inverse transformation, the normalization algorithm has been adopted, optimizing normalized parameters are selected by the deviation theory and the Newton iterative form to make the transformed wave field stable and reliable. By this method we can deal well with ill-posed question caused by large amount of integral coefficients and depress ill-posed problem of the first calculator function. The theoretical calculation indicated: the fictitious wave-field transformed by this method not only satisfies wave functions, but also has the dissemination, the reflection and the transmission.According to the former study,calculation of the wave field data already existed through the encryption.After the wave-field transform obtains the more higher resolution data resolution.By means of the theoretical model calculation, Proved that this method is more precise to the goal image formation,then increases the transient electromagnetic data processing precision.By means of the theoretical model calculation and the actual data processing, we proved that the method is reasonable, and by this method, we may strengthen the recognition of underground electric interface in transient electromagnetic method, and make it possible to make fine exploration...