Angle-Weighted Reverse Time Migration With Wavefield Decomposition Based on the Optical Flow Vector

Reverse time migration (RTM) is based on the two-way wave equation, so its imaging results obtained by conventional zero-lag cross-correlation conditions contain a lot of low-wavenumber noises. So far, wavefield decomposition method Poynting vector has been developed to suppress these noises; however, this also some problems, such as unstable calculation vector, low accuracy decomposition, and poor effect large-angle artifacts suppression. This article introduces optical flow RTM realize high-precision for both source receiver wavefields obtains four directions wavefields: up-, down-, left-, right-going. Then, sections one-way propagation components forward- back-propagated are optimized stacked. On basis, reflection angle each point calculated an attenuation factor related introduced weight generate optimal stack images. The tests theoretical model field marine seismic data illustrate that compared with angle-weighted proposed in can achieve calculate more accurately stably. Moreover, adopts weighting processing, which further eliminate effectively improve RTM.