Spc 4d

The review of current SPC 4D implementations highlights several distinct advantages over legacy systems:

| Pitfall | What to check | |--------|----------------| | Non-repeatable noise | NRMS > 50% near seafloor or above reservoir | | Processing artifacts | Match filtering, cross-equalization applied? | | Overburden changes | Seasonal velocity variations (4D in shallow gas) | | Scaling issues | Are differences clipped or scaled properly? | spc 4d