Surface‐wave elimination by interferometry with nonlinear local filter

Abstract

We present a technique to eliminate the surface waves by an interferometry+nonlinear local filter (NLF). This technique consists of 3 steps: i) remove the surface waves by the NLF; ii) predict the residual surface waves and primaries by the interferometric method; iii) predict the surface waves by the NLF and remove the residual surface waves by a matched filter. Field data tests, for both 2D and 3D surveys, show that this technique effectively mitigates surface waves and preserves much of the reflection information.

Physical and non-physical energy in scattered wave source-receiver interferometry

“…In recent years, the importance of seismic interferometry has emerged in many different fields of exploration geophysics. These include redatuming data sets to "virtual" (imagined) source or receiver locations Calvert, 2004, 2006;Schuster and Zhou, 2006;Schuster, 2009), ground roll (surface waves) removal Dong et al, 2006;Halliday et al, 2007Xue and Schuster, 2007), velocity analysis Curtis, 2011, 2012;, and imaging (Schuster and Ricket, 2000;Schuster et al, 2004;Thorbecke and Wapenaar, 2007;Vasconcelos et al, 2009Vasconcelos et al, , 2010Sava and Vasconcelos, 2010;Ravasi and Curtis, 2013). Theoretically, interferometry requires a closed boundary of sources surrounding a pair of receivers, and the availability of both monopole and dipole sources on that boundary.…”