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/demigration on prestack gathers. The input must be in 2D cmp gathers. The output is either 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
![Apex](https://www.tgs.com/hs-fs/hubfs/Apex.jpg?width=504&height=332&name=Apex.jpg)
Example Set 2:
![Differnece](https://www.tgs.com/hs-fs/hubfs/Differnece.jpg?width=960&height=576&name=Differnece.jpg)
Recent Technical Papers
Preprocessing
Advanced Signal Processing for Data Conditioning, Interactive Data Analysis