Multiwave And Multicomponents Numerical Simulation And Processing Of Data

This paper introduced elastic wave theories and elastic wave equations in transverseisotropic media and corresponding absorbing boundary conditions mainly, and executedforward modeling of seismic wavefield with finite difference method. According to thetheories researched, the physics experiment, the lithologic test and the observation andanalysis to actual data, it can be known that the media of the internal earth is anisotropicmedia that is not elastic and homogeneous. So it is necessary to study multiwave seismicexploration that research anisotropic media mainly. And forward modeling of the seismicwavefield is the foundation on knowing and using seismic anisotropy.To research the seismic wave of the anisotropic media, regardless of the research offield operating technique, or the relation of lithologic parameter and elastic wave equation,or the processing and analysis of the seismic wavefield in anisotropic media, all of thatcan not get away from seismic wavefield numerical simulation. Currently in all of theseismic wavefield numerical simulation technique, finite difference method is a kind ofnumerical computing method that is applied extensively, because of its characteristics ofthe quick calculation speed and high accuracy and wide application etc..When the numerical simulation of seismic wavefield is executed, this paper verifiedexplicit array of difference of P wave equation and SH wave and P-SV wave equationsand their absorbing boundary equations with the method of central-differenceapproximation of the partial derivative of the wave equation firstly. Secondly geologicmodels in isotropy and anisotropic media are established respectively. Assuming shotposition lie in center and on the top of the model respectively, and giving the geophysicsattribute parameter of the model, we solute the numerical solution of partial differentialequation adopting the rectangle mesh in a square area, writing the programming on theMATLAB module. At last we achieved seismic wavefield numerical simulation andanalysed the numerical simulation result.Seismic data processing of converted wave is the most difficult. The key technique issorting CCP gathers, wavefield separation,static correction, and horizontal stacking etc..Seismic data processing of converted wave is different from routine seismic dataprocessing. In this paper we introduced static correction method of converted wave, Ï„ ?ptransformation method to separate wavefield and two methods acquiring commonconverted point: velocity proportion of vertical and horizontal wave and stacking velocity.And we have give the actual data processing result about Area Luo which is processed ina module developed.