Research On The Methods Of Poststack Multi-wave Migration Of Anisotropic Media

The traditional migration technique is often on the basis of isotropic theory. But large numbers of data indicate that anisotropy lies widely in the underground media. So it is very important to study the seismic migration technique based on the anisotropy theory.Based on the research of the modeling and depth migration method of the isotropic media, we study the modeling and depth migration method of the anisotropic media, and optimize the traditional arithmetic, for knowing elastic wave propagation properties of the anisotropic media and more accurately describing the space distributing of the geologic objects.By the research and analysis, some good results are gained as follows: (1) We optimize the traditional arithmetic and ensure the accuracy and reliability of the arithmetic. The improved arithmetic is faster simple and efficient.(2) Absorbing boundary condition is very important in the modeling and depth migration. The problem is solved by combining the anti-periodic extension with the attenuate absorbing boundary condition.(3) Some knowledge about wave propagation in anisotropic media has been obtained by studying elastic wave propagation properties of the transversely isotropic media. The research for anisotropy is, for a certainty, of great significance both in theory and practice for the development of lithologic seismic survey and the like.(4)We carefully do research on the depth migration method of the transversely isotropic media and use the reverse-time depth migration method of the anisotropic media to realize multi-wave and multi-component migration.Some information and knowledge about wave field in anisotropic media have been obtained by contrasting with isotropic method. They are helpful for complex stratum image and lithologic parameter inversion.