Frequency-domain elastic reverse-time migration using wave-field separation

초록

Many researches based on wavefield separating migration techniques have been suggested for processing multi-component data properly. Those works were carried out in the time domain, however. In this paper, we propose the frequency-domain migration technique with wavefield separation. In the frequency domain, reverse-time migration can be implemented efficiently by the zero-lag convolution between virtual source and back-propagated wavefield. Our new migration can also be defined as the zero-lag convolution between the decomposed virtual source and the decomposed back-propagated wavefield derived by exploiting Helmholtz decomposition. P-and S-wave migration images can be obtained separately by defining the virtual source separately. We verify our new migration algorithm on synthetic seismic data generated from the Marmousi-2 model. We demonstrate that the results given by the new algorithm are more accurate than those of the conventional method without wavefield separation. © 2011 Society of Exploration Geophysicists.