Seismic Multiple Removal Techniques: Past, present and future. Revised Edition

Verschuur, Eric

doi:10.3997/9789073834569

Cited by 61 publications

(85 citation statements)

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“…Suppression of surface-related multiples has been addressed successfully by a few methods (Verschuur, 2013), whereas relatively few methods exist that identify and attenuate internal multiples. Methods that rely on move-out discrimination, for example, in the Radon domain (Hampson, 1986), tend to fail for internal multiples because their moveout velocities are often similar to those of primaries.…”

Section: Introductionmentioning

confidence: 99%

Relating source-receiver interferometry to an inverse-scattering series to derive a new method to estimate internal multiples

2016

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We have evaluated an explicit relationship between the representations of internal multiples by source-receiver interferometry and an inverse-scattering series. This provides a new insight into the interaction of different terms in each of these internal multiple prediction equations and explains why amplitudes of estimated multiples are typically incorrect. A downside of the existing representations is that their computational cost is extremely high, which can be a precluding factor especially in 3D applications. Using our insight from source-receiver interferometry, we have developed an alternative, computationally more efficient way to predict internal multiples. The new formula is based on crosscorrelation and convolution: two operations that are computationally cheap and routinely used in interferometric methods. We have compared the results of the standard and the alternative formulas qualitatively in terms of the constructed wavefields and quantitatively in terms of the computational cost using examples from a synthetic data set.

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Section: Introductionmentioning

confidence: 99%

Relating source-receiver interferometry to an inverse-scattering series to derive a new method to estimate internal multiples

2016

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“…Conventional imaging approaches such as reverse time migration (RTM) (Baysal et al, 1983) and Kirchhoff migration (Schneider, 1978) are based on the single-scattering approximation, which presupposes that the data are free of multiples. Free-surface multiples (those which have a downward reflection on the sea or land surface) can be attenuated using a variety of methods, a review of which can be found in Verschuur (2006). Unlike free-surface multiples, whose downward reflections occur at the known earth's surface, internal multiples have a downward reflections at a priori unknown subsurface interfaces making their detection, prediction, and attenuation much more difficult.…”

Section: Introductionmentioning

confidence: 99%

Attenuating multiple-related imaging artifacts using combined imaging conditions

Filho

Curtis

2016

GEOPHYSICS

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The objective of prestack depth migration is to position reflectors at their correct subsurface locations. However, migration methods often also generate artifacts along with physical reflectors, which hamper interpretation. These spurious reflectors often appear at different spatial locations in the image depending on which migration method is used. Therefore, we have devised a postimaging filter that combines two imaging conditions to preserve their similarities and to attenuate their differences. The imaging filter is based on combining the two constituent images and their envelopes that were obtained from the complex vertical traces of the images. We have used the method to combine two images resulting from different migration schemes, which produce dissimilar artifacts: a conventional migration method (equivalent to reverse time migration) and a deconvolution-based imaging method. We show how this combination may be exploited to attenuate migration artifacts in a final image. A synthetic model containing a syncline and stochastically generated small-scale heterogeneities in the velocity and density distributions was used for the numerical example. We compared the images in detail at two locations where spurious events arose and also at a true reflector. We found that the combined imaging condition has significantly fewer artifacts than either constituent image individually.

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“…Failure to satisfy either of these constraints can lead to artifacts in the resulting image. To avoid this multiples should be attenuated prior to migration by the use of techniques such as SRME (see Verschuur (2006)). Not only is this process computationally expensive and imperfect, but it also causes the information about the subsurface that is contained in the multiples to be lost.…”

Section: Limitations Of Conventional Rtmmentioning

confidence: 99%

Reverse time migration in the presence of known sharp interfaces

Richardson

Malcolm

2013

SEG Technical Program Expanded Abstracts 2013

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SUMMARYWe propose using the forward propagated source wave to create synthetic receiver data on the surfaces of the computational domain where real receiver data is not available as a means of exploiting known information about reflector locations in Reverse Time Migration. The inclusion of synthetic boundary data can make true amplitude imaging possible, and reduce the artifacts associated with the inclusion of multiples. Here, we describe the new method, present synthetic examples, and propose an appropriate imaging condition.

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Seismic Multiple Removal Techniques: Past, present and future. Revised Edition

Cited by 61 publications

References 0 publications

Relating source-receiver interferometry to an inverse-scattering series to derive a new method to estimate internal multiples

Relating source-receiver interferometry to an inverse-scattering series to derive a new method to estimate internal multiples

Attenuating multiple-related imaging artifacts using combined imaging conditions

Reverse time migration in the presence of known sharp interfaces

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