TY - GEN
T1 - Anisotropy signature in P-wave Extended images for VTI media
AU - Li, V.
AU - Tsvankin, I.
AU - Alkhalifah, Tariq Ali
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the sponsors of the Center for Wave Phenomena (CWP) and competitive research funding from the King Abdullah University of Science and Technology (KAUST), Saudi Arabia.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - Extended images obtained from reverse-time migration (RTM) contain information about the accuracy of the velocity field and subsurface illumination at different incidence angles. Here, we evaluate the influence of errors in the anisotropy parameters on the residual moveout (RMO) in P-wave extended images obtained with RTM for VTI (transversely isotropic with a vertical symmetry axis) media. Assuming the actual spatial distribution of the zero-dip normal-moveout velocity, we analyze extended images computed with distorted fields of the parameters ? and d. Differential semblance optimization (DSO) and stackpower criteria are employed to study the sensitivity of focusing to the anisotropy parameters. The results show that the signature of ? is dip-dependent, whereas errors in d cause defocusing in extended images only if that parameter varies laterally. We also obtain and analyze the gradients of the DSO objective function with respect to the anisotropy parameters. The results of this work provide the foundation for anisotropic wavefield tomography operating with extended images.
AB - Extended images obtained from reverse-time migration (RTM) contain information about the accuracy of the velocity field and subsurface illumination at different incidence angles. Here, we evaluate the influence of errors in the anisotropy parameters on the residual moveout (RMO) in P-wave extended images obtained with RTM for VTI (transversely isotropic with a vertical symmetry axis) media. Assuming the actual spatial distribution of the zero-dip normal-moveout velocity, we analyze extended images computed with distorted fields of the parameters ? and d. Differential semblance optimization (DSO) and stackpower criteria are employed to study the sensitivity of focusing to the anisotropy parameters. The results show that the signature of ? is dip-dependent, whereas errors in d cause defocusing in extended images only if that parameter varies laterally. We also obtain and analyze the gradients of the DSO objective function with respect to the anisotropy parameters. The results of this work provide the foundation for anisotropic wavefield tomography operating with extended images.
UR - http://hdl.handle.net/10754/663928
UR - http://www.earthdoc.org/publication/publicationdetails/?publication=85079
UR - http://www.scopus.com/inward/record.url?scp=85084688629&partnerID=8YFLogxK
U2 - 10.3997/2214-4609.201600834
DO - 10.3997/2214-4609.201600834
M3 - Conference contribution
SN - 9789462821859
T3 - 78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential
BT - 78th EAGE Conference and Exhibition 2016
PB - European Association of Geoscientists and Engineers, EAGE
T2 - 78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential
Y2 - 30 May 2016 through 2 June 2016
ER -