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The Leading Edge; August 2002; v. 21; no. 8; p. 787-790; DOI: 10.1190/1.1503182
© 2002 Society of Exploration Geophysicists
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Surface-related multiple elimination on wide-tow marine data

Mohamed T. Hadidi, Anatoly I. Baumstein and Young C. Kim

ExxonMobil Upstream Research Company, Houston, Texas

Corresponding author: m.t.hadidi@exxonmobil.com

The first 20% of the full text of this article appears below.

Surface-related multiples typically correspond to the largest component of multiple energy on marine seismic data because the surface is an almost perfect reflector with a reflectivity close to unity and, thus, their elimination is a major goal of seismic processing. Recent work has shown surface-related multiple elimination (SRME) to be effective in attenuating surface-related multiples, particularly in complex geology which may include diffracting features.

Figure 1 shows the basic idea behind SRME. A surface-related multiple is recorded at receiver Xr due to a shot at location Xs. The event is a surface-related multiple because it undergoes at least one downward reflection at the surface, in this case at A, during its propagation. One readily sees that this surface-related multiple event is the composition of two events: one recorded at A due to a shot at Xs and a second recorded at Xr due to a shot at A. Thus the basic operation in SRME is a spatio-temporal convolution of the data with itself. This gives the correct kinematics of the surface-related multiples, but not their amplitudes. The exact prediction is given by a cross-convolution of the data with the surface-related multiple-free version of the data and with proper accounting for directivity, ghosts, and the obliquity factor. In an iterative formulation, the (i+1)th estimate of the multiples is the cross-convolution of the data U with the ith estimate of the multiple-free data U0(i).


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  		Figure 1. Basic concept behind SRME.

 
SRME does not require any subsurface information, nor does it make any assumptions about seismic events such as hyperbolicity or moveout separation between primaries and multiples. As a result, SRME can handle arbitrarily complex multiples (including, in particular, diffracted multiples). In fact, SRME appears to be the only effective approach to attenuating diffracted multiples and this suggested the use of SRME for . . . [Full Text of this Article]






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