1887
Volume 62, Issue 6
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

We present an innovative approach for seismic image enhancement using multi‐parameter angle‐domain characterization of common image gathers. A special subsurface angle‐domain imaging system is used to generate the multi‐parameter common image gathers in a summation‐free image space. The imaged data associated with each common image gathers depth point contain direction‐dependent opening‐angle image contributions from all the available incident and scattered wave‐pairs at this point. Each direction‐dependent opening‐angle data can be differently weighted according to its coherency measure. Once the optimal migration velocity is used, it is assumed that in the actual specular direction, the coherency measure (semblance) along reflection events, from all available opening angles and opening azimuths, is larger than that along non‐specular directions. The computed direction‐dependent semblance attribute is designed to operate as an imaging filter which enhances specular migration contributions and suppresses all others in the final migration image. The ability to analyse the structural properties of the image points by the multi‐parameter common image gather allows us to better handle cases of complicated wave propagation and to improve the image quality at poorly illuminated regions or near complex structures. The proposed method and some of its practical benefits are demonstrated through detailed analysis of synthetic and real data examples.

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2014-09-08
2020-04-07
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References

  1. AudebertF., FroidevauxP., RakotoarisoaH. and Svay‐LucasJ.2002. Insights into migration in the angle domain. 72nd SEG Annual International Meeting, Expanded Abstracts, 1188–1191.
  2. AudebertF., NicoletisL., FroidevauxP. and RakotoarisoaH.2003. True amplitude migration in the angle domain by regularization of illumination. 73rd SEG Annual International Meeting, Expanded Abstracts, 921–924.
  3. BainaR., NguyenS., NobleN. and LambaréG.2003. Optimal anti‐aliasing for ray‐based kirchhoff depth migration. 73rd SEG Annual International Meeting, Expanded Abstracts, 1130–1133.
  4. BernasconiG. and ReS.2005. Seismic and geometrical attributes from image gathers. 75th SEG Annual International Meeting, Expanded Abstracts, 837–840.
  5. BeylkinG.1985. Imaging of discontinuities in the inverse scattering problem by inversion of a causal generalized Radon transform. Journal of Mathematical Physics26, 99–108.
    [Google Scholar]
  6. BienatiN., AndreolettiC., PerroneF., LipariV. and GiboliM.2009. Limited Aperture Migration in the Angle Domain. 71st EAGE Conference and Exhibition, Extended Abstract, U005.
  7. BiondiB. L.1998. Kirchhoff imaging beyond aliasing. Stanford Exploration Project report97, 13–35.
    [Google Scholar]
  8. BleisteinN.1984. Mathematical methods for wave phenomena. Academic press Inc.
    [Google Scholar]
  9. BleisteinN.1987. On the imaging of reflectors in the earth. Geophysics, 52, 931–942.
    [Google Scholar]
  10. ChenJ.2004. Specular ray parameter extraction and stationary‐phase migration. Geophysics, 69, 249–256.
    [Google Scholar]
  11. ClaerboutJ. F.1992. Anti aliasing. Stanford Exploration Project report73, 371–389.
    [Google Scholar]
  12. DafniR. and ReshefM.2012a. Interval velocity analysis using multiparameter common image gathers. Geophysics, 77, no. 4, U63‐U72.
    [Google Scholar]
  13. DafniR. and ReshefM.2012b. Image enhancement by CIG multi‐parameter characterization. 74th EAGE Conference and Exhibition, Extended Abstract, A024.
  14. KabbejA., BainaR. and DuquetB.2007. Aperture optimized two‐pass Kirchhoff migration. 77th SEG Annual International Meeting, Expanded Abstracts, 2339–2343.
  15. KlokovA., BainaR. and LandaE.2010. Separation and Imaging of Seismic Diffractions in Dip Angle Domain. 72nd EAGE Conference and Exhibition, Extended Abstract, G040.
  16. KorenZ., RavveI., BartanaA. and KosloffD.2007. Local angle domain in seismic imaging. 69th EAGE Conference and Exhibition, Extended Abstract, P287.
  17. KorenZ., RavveI., RagozaE., BartanaA. and KosloffD.2008. Full‐azimuth angle domain imaging. 78th SEG Annual International Meeting, Expanded Abstracts, 2221–2225.
  18. KorenZ. and RavveI.2010. Specular/diffraction imaging by full azimuth subsurface angle domain decomposition. 80th SEG Annual International Meeting, Expanded Abstracts, 3268–3272.
  19. KorenZ. and RavveI.2011. Full‐azimuth subsurface angle domain wavefield decomposition and imaging Part I: Directional and reflection image gathers. Geophysics, 76, no. 1, S1‐S13.
    [Google Scholar]
  20. LandaE., FomelS. and ReshefM.2008. Separation, imaging and velocity analysis of seismic diffractions using migrated dip‐angle gathers. 78th SEG Annual International Meeting, Expanded Abstracts, 2176–2180.
  21. NeelamaniR., DickensT. and DeffenbaughM.2006. Stack‐and‐Denoise: A New Method to Stack Seismic Datasets. 76th SEG Annual International Meeting, Expanded Abstracts, 2827–2831.
  22. NeidellN.S. and TanerM.T.1971. Semblance and other coherency measures for multichannel data. Geophysics, 36, 482–497.
    [Google Scholar]
  23. NolanC. J. and SymesW.W.1996. Imaging and coherency in complex structure. 66th SEG Annual International Meeting, Expanded Abstracts, 359–363.
  24. PatrikeevaN. and SavaP. C.2013. Comparison of angle decomposition methods for wave‐equation migration. 83rd SEG Annual International Meeting, Expanded Abstracts, 3773–3778.
  25. QinF., WangB., ZhangP. and AudebertF.2005. Kirchhoff PreSDM interactive dip‐gather stacking and dip illumination panel generation. 75th SEG Annual International Meeting, Expanded Abstracts, 1882–1885.
  26. RavveI. and KorenZ.2011. Full‐azimuth subsurface angle domain wavefield decomposition and imaging: Part 2 – Local angle domain. Geophysics, 76, no.2, S51‐S64.
    [Google Scholar]
  27. ReshefM. and RuegerA.2008. Influence of structural dip angles on interval velocity analysis. Geophysics, 73, no.4, U13‐U18.
    [Google Scholar]
  28. RickettJ. E. and SavaP. C.2002. Offset and angle‐domain common image‐point gathers for shot‐profile migration. Geophysics, 67, 883–889.
    [Google Scholar]
  29. RobinsonJ. C.1970. Statistically optimal stacking of seismic data. Geophysics, 35, 436–446.
    [Google Scholar]
  30. SavaP. C. and FomelS.2003. Angle‐domain common‐image gathers by wavefield continuation methods. Geophysics, 68, 1065–1074.
    [Google Scholar]
  31. SavaP. C. and FomelS.2005. Coordinate‐independent angle‐gathers for wave equation migration. 75th SEG Annual International Meeting, Expanded Abstracts, 2052–2055.
  32. SchleicherJ., HubralP., TygelM. and JayaM.1997. Minimum apertures and Fresnel zones in migration and demigration. Geophysics, 62, 183–194.
    [Google Scholar]
  33. TabtiH., GeliusL. and HellmannT.2004. Fresnel aperture prestack depth migration. First Break, 22, 39–46.
    [Google Scholar]
  34. XuS., ChaurisH., LambaréG. and NobleM.S.2001. Common‐angle migration: A strategy for imaging complex media. Geophysics, 66, 1877–1894.
    [Google Scholar]
  35. XuS., ZhangY. and TangB.2011. 3D angle gathers from reverse time migration. Geophysics, 76, no. 2, S77‐S92.
    [Google Scholar]
  36. YoonK., GuoM., CaiJ. and WangB.2011. 3D RTM angle gathers from source wave propagation direction and dip of reflector. 81st SEG Annual International Meeting, Expanded Abstracts, 3136–3140.
  37. YoonK. and MarfurtK.2004. Challenges in reverse‐time migration. 74th SEG Annual International Meeting, Expanded Abstracts, 1057–1060.
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  • Article Type: Research Article
Keyword(s): Depth migration , Imaging and Noise rejection
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