An efficient hybrid pseudospectral/finite-difference scheme for solving the TTI pure P-wave equation

Ge Zhan, Reynam C. Pestana, Paul L. Stoffa

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The pure P-wave equation for modelling and migration in tilted transversely isotropic (TTI) media has attracted more and more attention in imaging seismic data with anisotropy. The desirable feature is that it is absolutely free of shear-wave artefacts and the consequent alleviation of numerical instabilities generally suffered by some systems of coupled equations. However, due to several forward-backward Fourier transforms in wavefield updating at each time step, the computational cost is significant, and thereby hampers its prevalence. We propose to use a hybrid pseudospectral (PS) and finite-difference (FD) scheme to solve the pure P-wave equation. In the hybrid solution, most of the cost-consuming wavenumber terms in the equation are replaced by inexpensive FD operators, which in turn accelerates the computation and reduces the computational cost. To demonstrate the benefit in cost saving of the new scheme, 2D and 3D reverse-time migration (RTM) examples using the hybrid solution to the pure P-wave equation are carried out, and respective runtimes are listed and compared. Numerical results show that the hybrid strategy demands less computation time and is faster than using the PS method alone. Furthermore, this new TTI RTM algorithm with the hybrid method is computationally less expensive than that with the FD solution to conventional TTI coupled equations. © 2013 Sinopec Geophysical Research Institute.
Original languageEnglish (US)
Pages (from-to)025004
JournalJournal of Geophysics and Engineering
Volume10
Issue number2
DOIs
StatePublished - Feb 19 2013

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Industrial and Manufacturing Engineering
  • Geophysics
  • Management, Monitoring, Policy and Law
  • Geology

Fingerprint

Dive into the research topics of 'An efficient hybrid pseudospectral/finite-difference scheme for solving the TTI pure P-wave equation'. Together they form a unique fingerprint.

Cite this