Aperture width

The zero-offset response of the dipping reflector, shown in Figure 7, was migrated with a half-aperture width of 25 and 5 traces respectively as shown in Figure 11 and Figure 12. The choice of a small aperture results in undermigration. As the migration aperture becomes smaller, the edge diffractions become more pronounced. Also, the reflector is not fully shortened to its actual length, and the dip remains smaller than the true structural dip. As the aperture increases, the reflector is migrated closer to its true location and the output section is improved.

 

f3-23a
Figure 11 Migration of the zero-offset response of the dipping reflector shown in Figure 7 using a limited migration aperture width (half-aperture, 25 traces).

 

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Figure 12 Output migrated section (half-aperture, 5 traces).