Comparison and analysis of multiple reverse-time migration and conventional reverse-time migration

In the process of conventional reverse-time migration,the numerical impulsive source is replaced with the recorded data including primaries and multiples on the surface and are extrapolated forward in time to each depth level,while the recorded primary reflections are replaced with multiples and are extrapolated backward in time to the same depth levels,then we select the appropriate imaging condition to realize the multiples imaging based on RTM The above process is Multiple RTM.In this paper,we analyzes the conventional RTM's imaging capability of multiples and then discuss the theory of Multiple RTM.Numerical examples show that the multiples can be imaged by RTM Only the pairs of the wave field energy between the extrapolated forward source wavefield and the extrapolated backward predicted multiples can be crosscorrelated to produce the real imaging values.Multiple RTM can provide more vast and precise underground lighting and imaging for the deeper and more complex seismic exploration.