Separation of Reflection from Diffraction Events via the CRS Technique and a Blind Source Separation Method based on Sparsity Maximization
Leonardo Tomazeli Duarte, Renato Lopes, Jorge Henrique Faccipieri Junior, João Marcos Travassos Romano, Martin Tygel · 2013
Recent work has shown that, besides providing a conventional stacked section in which reflections are enhanced, the Common-Reflection-Surface (CRS) stacking method may be used to obtain a stacked section mainly composed of diffraction events. Therefore, CRS can be applied to separate reflection and diffraction events in the resulting zero-offset (ZO) sections. However, in practice, there is still mutual interference in the sections obtained by the stacking process. To improve the quality of separation, we propose an additional step based on a signal processing framework known as blind source separation (BSS). The adopted BSS method relies on the concept of sparsity, which suits well the overall characteristic of the reflection events. Numerical experiments with synthetic and field data show that the proposed additional step leads to better results with respect to the stacked section generated by CRS.