METHODS AND SYSTEMS FOR FINITE-DIFFERENCE WAVE EQUATION MODELLING

摘要

A computer implemented method of determining a seismic wavefield in a region of a subsurface of the Earth by eliminating temporal dispersion from a finite difference, FD, wavefield generated from seismic wave propagation data. The method comprises obtaining the FD wavefield containing temporal dispersion by solving a discretized wave equation using the seismic wave propagation data; transforming the FD wavefield from a time domain to a frequency domain using a Fourier transform; and inverse transforming the FD wavefield from the frequency domain using an inverse Fourier transform, wherein the inverse Fourier transform uses a modified frequency based on a temporal discretization of the FD wavefield, to give the seismic wavefield in the time domain.