Water bottom multiple

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The water-bottom primary reflection P(Z) is the convolution of the source waveform with the water-bottom response; so P(Z)=S(Z)F(Z). The first multiple reflection M (Z) sees the same source waveform, the ocean floor, a minus one for the free surface, and the ocean floor again.

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Application of these methods to several seismic lines indicates that trace distance weighting is the most useful method studied for suppressing deep-water-bottom multiples for data from the Atlantic Outer Continental Shelf.


The aim of seismic data processing is to obtain accurate image of the subsurface which can be interpreted in terms of subsurface structures favourable to hydrocarbon accumulation. On the left is a water-layer multiple which is a multiple with at least one upwards bounce at the water bottom and one downward bounce at the surface. It is a special case of the more general free-surface multiple, which must have a bounce from the free-surface but may or may not include an upward bounce at the water bottom.
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The invention is a method for removing trapped water bottom multiples (figure 2, item 19), receiver side peg-leg multiples (13), and source side peg-leg multiples (15) from dual sensor (figure 1, item 6), OBC (7) data, where the data includes both pressure signals and velocity signals.

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The first-order multiple of the water bottom has a travel time ranging around double that of the original reflection, so in the subject survey area it is in the range of s – s two-way time (TWT). Multiples from the water bottom (the interface of the base of water and the rock or sediment beneath it) and the air-water interface are common in marine seismic data, and are suppressed by seismic processing.

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Multiple suppression: A literature review CREWES Research Report — Volume 15 () 3 a) b) FIG. 1. Real CMP gather in the tau–p domain a) before and b) after multlchannel deconvolution from an area with a strongly dipping water bottom (after Lokshtanov, ). Read "Water‐bottom multiple attenuation by Kirchhoff extrapolation, Geophysical Prospecting" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

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Water bottom multiple elimination January The aim of seismic data processing is to obtain accurate image of the subsurface which can be interpreted in terms of subsurface structures. upgoing energy above the first water bottom multiple (Schalkwijk et al, ), the resultant scan could be automatically evaluated to determine the scalars which best minimised the upgoing energy for each receiver, therefore providing the correct wavefield separation.
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Very often the water bottom is a strong first order multiple generator. ‘Peg legs’ are formed by signals bouncing several times between certain subsurface layers before being recorded at the surface. This bouncing effect of the wavefront is also known as ‘reverberation’.

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