Statics corrections and frequency-wavenumber filtering
It should be noted that coherent linear noise on shot gathers can be influenced kinematically by surface topography and a near-surface refractor geometry. Specifically, linearity of the coherent noise may be distorted across a shot record. Distortions along a linear event in the t − x domain cause smearing of energy over a broad range of wavenumbers in the f − k domain. This, in turn, would make it difficult to specify a pass-fan for reflection energy. It can be concluded that statics corrections, at least in the form of field statics, should be applied to shot records prior to f − k filtering.
- Random noise and frequency-wavenumber filtering
- Dip filtering of coherent linear noise
- Frequency-wavenumber multiple attenuation