Angle-domain illumination gathers by wave-equation-based methods |

We present a method for computing the wave-equation-based angle-domain illumination for subsurface structures.
It creates subsurface illumination for different scattering or/and dip angles for a given acquisition geometry, velocity model and frequency bandwidth.
The proposed method differs from the conventional method in that it does not require local plane-wave decompositions
for each source and receiver Green's functions. Instead, it transforms a precomputed
subsurface-offset-indexed sensitivity kernel into angle domain using either a Fourier-domain mapping or a space-domain slant stack.
We show that
the computational cost can be significantly reduced by phase encoding the receiver-side Green's functions, or by
simultaneously encoding both the source- and receiver-side Green's functions.
Numerical examples demonstrate the accuracy and efficiency of our method.
The main anticipated applications of our method are in areas of:
(1) accurate amplitude-versus-angle (AVA) analysis by compensating depth-migrated images with angle-dependent illumination,
(2) migration velocity analysis that incorporates angle-dependent illumination for robust residual parameter estimation,
and (3) optimum seismic survey planning.

- introduction
- Subsurface-offset-domain image and illumination
- Angle-domain image and illumination

- Reducing the cost by phase encoding
- numerical examples
- conclusions
- Bibliography
- About this document ...

Angle-domain illumination gathers by wave-equation-based methods |

2010-05-19