Technique Research On The Cross-well Seismic Anisotropic Medium Wavefield And Parameter

The study of anisotropy has attracted much attention these years and became oneof the most difficult issues in the geophysical industry. Since a large amount of data hassuggested that seismic anisotropy were widely existed in underground terrenes, theforward seismic model and parameter analysis became the main contents of the currentseismic exploration studies. Previous studies always considered all the media on earthwere isotropic instead of anisotropic, which, to my knowledge, would bring some errorsin those results. As propagation of seismic wave in anisotropic media is more complexthan that in the isotropic one, it brought a new challenge to our traditional research andproduction. Therefore, the study of the anisotropy of the earth media could contributesignificantly to the improvement of seismic imaging and reservoir description during oiland gas exploration and development.This study demonstrated the wave theory in anisotropic media based on anisotropictheory and showed the quantitative relationship between the elastic parameters ofanisotropic media and Thomsen characterization parameter. This research was financialsupported by the key project "study on cross-hole Seismic data processing methodsabout inclined well at sea", from the National Science and Technology. discussed indetail the2D2C first-order coupled elastic equations of particle velocity-stress and anyorder accurate time and space staggered-grid finite-difference scheme and itsimplementation process, and used perfectly matched layer absorbing boundaryconditions, to realized the wave field modeling of complex cross-well geological modelA detailed analysis is made in anisotropic medium geological model of different wavefield characteristic and the changes of anisotropic parameters when the change of thewave analysis for wave field recognition and separation laid a foundation.In addition, the paper also analyzed the VTI medium based on previous results,using P, SV wave propagation equation of the Taylor, and suggested a strata speedcontaining layer informations as well as a more accurate wave transmission time, whichmight result in the seismic elastic parameters between Wells of inversion.