Page 186 - Acquisition and Processing of Marine Seismic Data

3.3 MULTIPLE REFLECTIONS 177

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FIG. 3.5 (A) Bubble effect (red arrows) of a 105 in single air gun on a shot gather. (B) Bubble effect (blue arrows) mimics the
seabed on the near trace sections with as a reversed-polarity continuous event.

FIG. 3.6 Attenuation of bubble amplitudes (blue arrows) by a predictive deconvolution application. (A) Before and (B) after
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deconvolution of the section obtained by a single 45 in ordinary air gun source.

3.3 MULTIPLE REFLECTIONS stack sections. These reflections may constitute
significant issues especially in shallow water
Multiple reflections occur when the seismic surveys. Because the seabed is a good reflector
signal travels along the same ray path more than with relatively high reflection coefficient, it
one time, and they produce reflection arrivals reflects back an important portion of incoming
that repeat themselves on the shot records and seismic energy towards to sea surface, recorded