Direct vector-field method to obtain angle-domain common-image gathers from isotropic acoustic and elastic reverse time migration

We have developed an alternative (new) method to produce common-image gathers in the incident-angle domain by calculating wavenumbers directly from the P-wave polarization rather than using the dominant wavenumber as the normal to the source wavefront. In isotropic acoustic media, the wave propagation direction can be directly calculated as the spatial gradient direction of the acoustic wavefield, which is parallel to the wavenumber direction (the normal to the wavefront). Instantaneous wavenumber, obtained via a novel Hilbert transform approach, is used to calculate the local normal to the reflectors in the migrated image. The local incident angle is produced as the difference between the propagation direction and the normal to the reflector. By reordering the migrated images (over all common-source gathers) with incident angle, common-image gathers are produced in the incident-angle domain. Instantaneous wavenumber takes the place of the normal to the reflector in the migrated image. P- and S-wave separ...

[1]  Yu Zhang,et al.  3D angle gathers from reverse time migrationXu et al.RTM 3D angle gathers , 2011 .

[2]  Yu Zhang,et al.  3D angle gathers from reverse time migration , 2010 .

[3]  G. McMechan,et al.  2D and 3D elastic wavefield vector decomposition in the wavenumber domain for VTI media , 2010 .

[4]  Xiang Xiao,et al.  Local vertical seismic profiling (VSP) elastic reverse-time migration and migration resolution: Salt-flank imaging with transmitted P-to-S waves , 2010 .

[5]  Lorie K. Bear,et al.  A Comparison of Methods For Obtaining Local Image Gathers In Depth Migration , 2010 .

[6]  Norden E. Huang,et al.  On Instantaneous Frequency , 2009, Adv. Data Sci. Adapt. Anal..

[7]  Paul Sava,et al.  Isotropic angle-domain elastic reverse-time migration , 2008 .

[8]  William W. Symes,et al.  Automatic velocity analysis via shot profile migration , 2008 .

[9]  George A. McMechan,et al.  Imaging conditions for prestack reverse-time migration , 2008 .

[10]  Full‐azimuth angle domain imaging , 2008 .

[11]  G. McMechan,et al.  True-amplitude prestack depth migration , 2007 .

[12]  Gary Martin,et al.  Marmousi2 An elastic upgrade for Marmousi , 2006 .

[13]  P. Sava,et al.  Wave‐equation common‐angle gathers for converted waves , 2005 .

[14]  Paul Sava,et al.  Coordinate-independent Angle-gathers For Wave Equation Migration , 2005 .

[15]  Paul Sava,et al.  Wave-equation migration velocity analysis. I. Theory , 2004 .

[16]  W. Symes,et al.  Angle‐domain common‐image gathers for migration velocity analysis by wavefield‐continuation imaging , 2004 .

[17]  G. McMechan,et al.  Separating P- and S-waves in prestack 3D elastic seismograms using divergence and curl , 2004 .

[18]  K. Yoon,et al.  Challenges In Reverse-time Migration , 2004 .

[19]  Paul Sava,et al.  Angle-domain common-image gathers by wavefield continuation methods , 2003 .

[20]  B. Ursin,et al.  Scattering-angle migration of ocean-bottom seismic data in weakly anisotropic media , 2003 .

[21]  Z-99 Directional illumination and acquisition dip- response , 2003 .

[22]  Laurence Nicoletis,et al.  True Amplitude Migration In the Angle Domain By Regularization of Illumination , 2003 .

[23]  H. Calandra,et al.  3D preserved-amplitude prestack depth migration and amplitude versus angle relevance , 2002 .

[24]  Sergey Fomel,et al.  Applications of plane-wave destruction filters , 2002 .

[25]  Paul Sava,et al.  Offset and angle-domain common image-point gathers for shot-profile migration , 2002 .

[26]  M. Pinsky.  Introduction to Fourier analysis and wavelets , 2002 .

[27]  Ru-Shan Wu,et al.  Extracting Angle Domain Information From Migrated Wavefield , 2002 .

[28]  Biondo Biondi,et al.  Prestack imaging of overturned reflections by reverse time migration , 2002 .

[29]  Julie Svay‐Lucas,et al.  Insights into migration in the angle domain. , 2002 .

[30]  Sheng Xu,et al.  Common‐angle migration: A strategy for imaging complex media , 2001 .

[31]  L. Nicoletis,et al.  Antialiased 3D True Amplitude Common Diffraction Angle Migration by Regularization in the Dip Domain , 2001 .

[32]  G. Lambaré,et al.  Can we quantitatively image complex structures with rays , 2000 .

[33]  P. Froidevaux,et al.  A multi‐angle toolbox for restored amplitude images and AVA‐Gathers , 2000 .

[34]  Biondo Biondi,et al.  Angle-domain common image gathers by wave-equation migration , 1999 .

[35]  Alan C. Bovik,et al.  Skewed 2D Hilbert transforms and computed AM-FM models , 1998, Proceedings 1998 International Conference on Image Processing. ICIP98 (Cat. No.98CB36269).

[36]  C. Mosher,et al.  Common Angle Imaging With Offset Plane Waves , 1997 .

[37]  W. Symes,et al.  Imaging And Coherency In Complex Structures , 1996 .

[38]  A. J. Berkhout,et al.  Angle-dependent reflectivity by means of prestack migration , 1990 .

[39]  Paul G. Richards,et al.  Pulse distortion and Hilbert transformation in multiply reflected and refracted body waves , 1975, Bulletin of the Seismological Society of America.

[40]  J. Claerbout.  Toward a unified theory of reflector mapping , 1971 .