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Conclusions

An extension to a widely used transformation allows descriptions of migrated images in components corresponding to various dip, scattering and azimuth angles. Two angles are enough to fully describe the imaged reflectivity in the case of a 2-D experiment. In the more general 3-D case, images are described by four angles.

This image transformation has many applications, among which amplitude compensation Sava et al. (2001) for AVA analysis, and illumination normalization for limited and irregular data acquisition. We could also imagine many other ways of filtering our migrated images in various sub-panels of the 3-D decomposition, to correct or eliminate specific events.

Finally, I emphasize that neither the standard nor this extended multi-angle ADCIG transformation add any new information that does not already exist in the migrated image. Both represent decompositions of the image in subsets that are useful and simply more convenient for different applications.

 
acig3d
Figure 10
Angle gather obtained by the traditional ADCIG equation (left). 3-D angle gather obtained by summation over the reflector dip angles $\delta_x$, $\delta_y$and acquisition azimuth $\beta$ (right).
acig3d
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next up previous print clean
Next: REFERENCES Up: Sava: Image decomposition Previous: Examples
Stanford Exploration Project
7/8/2003