Up: Image space attenuation of
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To attenuate multiples in the image space via filtering in the Radon domain,
we need an accurate representation of their residual moveouts in either SODCIGs or
ADCIGs. Accounting for ray-bending at the multiple-generating interface increases
the focusing power of the Radon transform and therefore the separation between
primaries and multiples.
The apex-shifted Radon transform in ADCIGs to map from to
has proven to be effective in attenuating specular and
diffracted multiples in 2D marine data. The residual moveout of both
multiples in ADCIGs is well-behaved and the extra dimension provided by
the apex-shift allows the attenuation of the multiples without compromising
the integrity of the primaries.