F-K Transform

Description Transform gathers to / from the F-K domain.
Module(s) Image Gather Processing
Requirements Gathers
Related F-X Transform, F-X Deconvolution
Works with Gathers

This process performs a forward or reverse F-K transform, where F is the frequency and K is the wave-number. The F-K domain can separate several noise types, such as ground roll or seismic interference.

Use the F-K transform in conjunction with the Polygon Mute process. First, decompose the input into a series of dipping lines in F-K space, then suppress the noise by muting.

A forward F-K transform creates two "k" domain gather volumes: amplitude and phase.

Output records begin at 0 ms TWT, and will be at least as long as the input data.

Headers Modified:

  • AFILS - The K wavenumber, when in K space
  • MUTE, MUTS - Temporary storage when in K space; the original values of these headers will not be preserved through a forward/reverse transform.

Create F-K Transform process

Create F-K Transform process
  1. In the Control Panel, open the Process tab.
  2. At the tab header, click the Add icon and select New Process.
  3. Double-click F-K Transform.
  4. Type a name for the process and click OK.
  5. In the Details Panel, select an input gather Volume.
  6. By default, this process will perform a forward F-K transform. Select the Reverse check box to perform a reverse F-K transform.

The F-K Transform process works in conjunction with the polygon mute process (see Polygon Mute).



Create a Polygon Mute process (see Polygon Mute) and add new F-K Transform mute (orange polygon).

Now back-off the F-K Transform and look at the data with polygon mute applied in F-K domain.

Create a F-K Transform process and select reverse.

Compare the before and after result: