Apex-Shifted Diffraction Model Building
Process designed to generate the model of Apex-Shifted Diffraction Multiples (ASDM)
The calculation is based on a simple constant velocity migration/
on prestack gathers. The input must be in 2D cmp gathers. The output is either demigration image or model in the same type of gather.
In order to select the ASDM, the process first transforms the data into
For the thresholding step in the image domain, the whole gather can be considered as one window or multiple windows, in which amplitude averaging and a constant threshold factor
Commonly, an adaptive subtraction step follows this process to remove the apex-shifted diffraction multiples from the input data.
ApexShifted Diffraction Model Building
Example Set 2:
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