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Green function retrieval versus Interferometric imaging Kees Wapenaar Deyan Draganov

Green function retrieval versus Interferometric imaging Kees Wapenaar Deyan Draganov Delft University of Technology 2005 Joint Assembly May 25, 2005 New Orleans. Contents. Green’s function retrieval Interferometric imaging Comparison. (passive) data. Contents.

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Green function retrieval versus Interferometric imaging Kees Wapenaar Deyan Draganov

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  1. Green function retrieval versus Interferometric imaging Kees Wapenaar Deyan Draganov Delft University of Technology 2005 Joint Assembly May 25, 2005 New Orleans

  2. Contents Green’s function retrieval Interferometric imaging Comparison

  3. (passive) data

  4. Contents Green’s function retrieval Interferometric imaging Comparison

  5. Phys. Rev. Lett., 2004, 93 (25), 254301-1 - 254301-4

  6. Phys. Rev. Lett., 2004, 93 (25), 254301-1 - 254301-4

  7. Phys. Rev. Lett., 2004, 93 (25), 254301-1 - 254301-4

  8. Phys. Rev. Lett., 2004, 93 (25), 254301-1 - 254301-4

  9. 1500 m/s 2000 m/s Retrieval of reflection response: acoustic approximation

  10. (variable ) (fixed , variable )

  11. (fixed , variable ) (fixed , variable )

  12. 1500 m/s 2000 m/s Uncorrelated noise sources

  13. (fixed , variable ) (variable )

  14. Contents Green’s function retrieval Interferometric imaging Comparison

  15. (passive) data (passive) data

  16. 0 t • Forward extrapolation of ‘source’ • Inverse extrapolation of receiver • Cross-correlation • Integrate along receivers

  17. Ghost • Forward extrapolation of ‘source’ • Inverse extrapolation of receiver • Cross-correlation • Integrate along receivers • Repeat for all subsurface points

  18. Ghost Schuster, EAGE 2001, GJI 2004 Artman et al., EAGE 2004 Draganov et al., SEG 2004

  19. Contents Green’s function retrieval Interferometric imaging Comparison

  20. 1500 m/s 2000 m/s Retrieval of reflection response: acoustic approximation Green’s function retrieval Integration along sources

  21. Green’s function retrieval Integration along sources Interferometric imaging

  22. Ghost Green’s function retrieval Integration along sources Interferometric imaging Integration along receivers

  23. Green’s function retrieval Integration along sources Interferometric imaging Integration along receivers

  24. Passive Seismic Imaging in Complex Media Numerical comparison with varying number of underground sources Reconstructed depth image Reconstructed reflection response Directly modelled reflection response 33 minutes of white noise recording with 225 subsurface sources

  25. Passive Seismic Imaging in Complex Media Numerical comparison with varying number of underground sources Reconstructed depth image Reconstructed reflection response Directly modelled reflection response 6 minutes of white noise recording with 113 subsurface sources

  26. Passive Seismic Imaging in Complex Media Numerical comparison with varying number of underground sources Reconstructed depth image Reconstructed reflection response Directly modelled reflection response 6 minutes of white noise recording with 57 subsurface sources

  27. Passive Seismic Imaging in Complex Media Numerical comparison with varying number of underground sources Reconstructed depth image Reconstructed reflection response Directly modelled reflection response 6 minutes of white noise recording with 11 subsurface sources

  28. Passive Seismic Imaging in Complex Media Numerical comparison with varying number of underground sources Reconstructed depth image Reconstructed reflection response Directly modelled reflection response 6 minutes of white noise recording with 6 subsurface sources

  29. Conclusions • Green’s function retrieval • diffuse wave fields • non-diffuse wave fields: representation theory • many sources required • primaries and multiples (coda) • no medium information required • Interferometric imaging • diffuse ornon-diffuse wave fields • few sources required • primaries only (multiples imaged as ghosts) • background medium required

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