Full text loading...
-
An optimized hybrid pseudospectral/finite-difference modeling of TTI pure P-wave equation and reverse time migration
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017, Jun 2017, Volume 2017, p.1 - 3
Abstract
In recent years, many scholars have proposed some new seismic numerical simulation methods in tilted transversely isotropic (TTI) media. The purpose of these schemes is to remove the shear-wave artefacts and to make the wavefield stable in media with highly varying dip and azimuth angles. Obviously, some methods will lead to a low speed of calculation. We consider that hybrid pseudo-spectrum and finite difference TTI pure P-wave equation can remove the shear-wave components well. So, we add the optimized operator to improve the fitting degree of the wave number terms, meanwhile make the finite difference terms to eight-order accuracy. This scheme improves the stability of the pure P-wave equation. We convert the equation into a format with one forward FFT and two inverse FFTs. Fewer wavenumber terms and more finite-difference terms can reduce the computational complexity of each time step. In the 2D fault model, numerical simulation is carried out, and reverse time migration imaging is performed with the excitation amplitude imaging conditions. We can conclude that this optimized hybrid pseudospectral/finite-difference scheme can provide stable and accurate seismic data in the complex TTI model.