A synthetic anisotropic dataset

Figure compares the 19-point filter with the new 5-point filter for the migration of an anisotropic synthetic dataset. Shan and Biondi (2005) migrate this dataset with the anisotropic plane-wave migration in tilted coordinates. Figure (a) shows the density model of this synthetic dataset. We can see the steeply dipping salt flank in the density model. Figure (b) is the anisotropic plane-wave migration in tilted coordinates with the 19-point filter. Figure (c) is the anisotropic plane-wave migration in tilted coordinates with the improved 5-point filter. The migration result of the new 5-point filter is very close to the 19-point filter, though it loses a little resolution at the salt flank. This synthetic data example shows that we can get good accuracy for high-angle energy in tilted coordinates, though we use the improved 5-point filter, which is less accurate than 19-point filter.

 

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Figure 5 Comparison of the 2D impulse response of the 19-point filter and the improved 5-point filter. (a) The impulse response of the 19-point filter. (b) The impulse response of the improved 5-point filter.