Multi-component wavefield separation applied to high-resolution surface seismic data

Abstract A detailed characterisation of the subsurface using high-resolution multi-component seismic data requires additional processing. We adapted a frequency-domain wavefield separation method and applied it in an iterative way to subsets of a nine-component CMP survey recorded in The Netherlands. The method is well suited to remove the Rayleigh-wave. Further decomposition of the data in the case of two-component wavefield separation made it possible to group P- and S-wave sections and attempt an interpretation of events based on zero-offset arrival times, computed from existing velocity–depth profiles. Three-component separation failed beyond the extraction of the Rayleigh wave because events were not sufficiently present on all receiver components to allow for a description in terms of all polarisation parameters. The absence of the Love wave due to subsurface conditions simplified the processing of the data subset, with source and receivers oriented in a crossline-horizontal direction, to a depth converted stack, which agrees with results found earlier. The detected dipping of a peat layer was later confirmed by cone penetration tests (CPT).

[1]  T. W. Spencer,et al.  Estimation of polarization and slowness in mixed wavefields , 1992 .

[2]  Alan G. Green,et al.  Effects of near‐surface waveguides on shallow high‐resolution seismic refraction and reflection data , 1996 .

[3]  Cengiz Esmersoy,et al.  Inversion of P and SV waves from multicomponent offset vertical seismic profiles , 1990 .

[4]  E. Verschuur,et al.  Decomposition of Multicomponent Ocean-bottom Data In Two Steps , 1998 .

[5]  K. Scott Leaney,et al.  Parametric Wavefield Decomposition And Applications , 1990 .

[6]  Stewart Greenhalgh,et al.  Controlled Direction Reception Filtering of P- and S-Waves In τ-P Space , 1990 .

[7]  J. W. M. Dankbaar,et al.  Separation of P- and S-waves , 1985 .

[8]  Wavefield Separation And Estimation of Near Surface Properties Using Densely Deployed 3C Single Sensor Groups In Land Surface Seismic Recordings , 2000 .

[9]  C. Wapenaar,et al.  Elastic wavefield decomposition: Before or after extrapolation? , 1991 .

[10]  S. Richwalski,et al.  Practical aspects of wavefield separation of two‐component surface seismic data based on polarization and slowness estimates , 2000 .

[11]  Alan G. Green,et al.  A workshop examination of shallow seismic reflection surveying , 1997 .

[12]  J. Sallas,et al.  Seismic vibrator control and the downgoing P-wave , 1984 .

[13]  Sandra M. Richwalski.  Multi-component wavefield separation with application to land seismic data , 2000 .

[14]  M. V. D. Veen,et al.  Design Characteristics of a Seismic Land Streamer for Shallow Data Acquisition , 1999 .