


 Simulating propagation of separated wave modes in general anisotropic media,
Part II: qSwave propagators  

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Published as Geophysics, 81, no. 2, C39C52, (2016)
Simulating propagation of separated wave modes in general anisotropic media,
Part II: qSwave propagators
Jiubing Cheng^{}and Wei Kang^{}
^{}State Key Laboratory of Marine Geology,
Tongji University, Shanghai, China. Email: cjb1206@tongji.edu.cn
^{}Formerly Tongji University, Shanghai, China;
presently Schlumberger, Houston, Texas, USA. Email: wkang@slb.com
Abstract:
Shear waves, especially converted modes in multicomponent seismic data,
provide significant information that allows better delineation of
geological structures and characterization of petroleum reservoirs.
Seismic imaging and inversion based upon the elastic wave equation involve high computational
cost and many challenges in decoupling the wave modes and estimating so many model parameters.
For transversely isotropic media, shear waves can be designated as pure SH and quasiSV modes.
Through two different similarity transformations to the Christoffel equation aiming to project the
vector displacement wavefields onto the isotropic references of the polarization directions,
we derive simplified secondorder systems (i.e., pseudopuremode wave equations)
for SH and qSVwaves, respectively.
The first system propagates a vector wavefield with two horizontal components, of which the summation
produces puremode scalar SHwave data,
while the second propagates a vector wavefield with a summed horizontal component and a vertical component,
of which the final summation produces a scalar field dominated by qSVwaves in energy.
The simulated SH or qSVwave has the same kinematics as its counterpart in the elastic wavefield.
As explained in our previous paper (part I), we can obtain completely separated
scalar qSVwave fields after spatial filtering the pseudopuremode qSVwave fields.
Synthetic examples demonstrate that these wave propagators provide efficient and flexible tools
for qSwave extrapolation in general transversely isotropic media.



 Simulating propagation of separated wave modes in general anisotropic media,
Part II: qSwave propagators  

Next: Introduction
Up: Reproducible Documents
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