Page 499 - Acquisition and Processing of Marine Seismic Data

490 10. NORMAL MOVEOUT CORRECTION AND STACKING

FIG. 10.33 Stack sections with NMO stretch limit percentage of (A) 20%, and (B) 60%. Small stretch limits may cause ver-
tical gaps in the stack section around the seafloor.

FIG. 10.34 Stack sections with NMO stretch limit percentage of (A) 90%, and (B) 40%. For higher limits, guided wave
amplitudes may emanate in the stack section.

to get an acceptable stack (Fig. 10.33B). How- If the stretch limit is too high, then the ampli-
ever, the increment must be determined care- tudes of these waves emanate in the stack sec-
fully because the far offsets of shallow waters tion, as in the example data in Fig. 10.34A.
contain guided wave amplitudes in most cases. Considering a stretch mute with a lower stretch