The application of polarizing filtering with floating coordinate system in 3D3C VSP wavefield separation

Abstract

Due to the diversity of measuring geometry, the wavefields from 3D3C vertical seismic profile (VSP) are often complex, and therefore wavefield separation is very important in the processing of VSP data. In this abstract, we analyzed the theory of polarizing filtering with floating coordinate system (PFFCS) and applied it to 3D3C VSP field dataset. We reviewed the methods of computing polarizing angle and described the algorithm of PFFCS. The polarizing angles of reflected wave computed by PFFCS vary with the traces and reflection layers. Depending on the direction of the concentrated reflected wave from the reflection point, the coordinate system is established. We set up the processing workflow according to characteristics of the field VSP dataset, effectively separated and obtained the all kinds of wavefield. Compared to the conventional polarizing filter, the PFFCS gives a better result for this field data.