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Published byDamien Lilley Modified about 1 year ago

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Multiple attenuation in the image space Paul Sava & Antoine Guitton Stanford University SEP

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Goal Method feasible in 3-D Less expensive Dense data requirement Exploit the data/imaging mismatch Data: two-way propagation Migration: one-way extrapolation

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Key technology Migration by wavefield extrapolation (WEM) Angle-domain common-image gathers High resolution Radon Transforms

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The big picture WE prediction S/N separation Data RT & Mute Image Data NMO RT & Mute WE migration & ADCIG Image

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Multiple attenuation by RTs –Moveout analysis NMO –Moveout analysis WE migration –S/N separation RT + Mute –S/N separation RT + Mute

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3-D depth imaging WE migration –Multi-arrival Angle-gathers –Single-valued Kirchhoff migration –Single-arrival Offset-gathers –Multi-valued Biondi et al. (2003) Stolk & Symes (2002) z x y

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Synthetic example: data vs. image CMP CIG

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Which Radon transform? Generic Radon Transform Parabolic Biondi & Symes (2003) Tangent q g( ) z

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Synthetic example: RTs Tangent Parabolic

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Synthetic example: S/N separation primaries & multiples primariesmultiplesART + muteART

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BP synthetic example

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primaries & multiples primariesmultiplesART BP synthetic example

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primaries & multiples primariesmultiples BP synthetic example: stacks

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GOM example

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primaries & multiples primariesmultiplesART + muteART GOM example: CIG 1

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GOM example

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primaries & multiples primariesmultiplesART + muteART GOM example: CIG 2

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GOM example

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GOM example: zoom 1 primaries & multiples

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GOM example: zoom 1 primaries

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GOM example: zoom 1 primaries & multiples

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GOM example: zoom 1 multiples

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GOM example

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GOM example: zoom 2 primaries & multiples

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GOM example: zoom 2 primaries

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GOM example: zoom 2 primaries & multiples

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GOM example: zoom 2 multiples

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RT comparison Image space RTData space RT

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Discussion PROs –Cheap & robust –3-D –Simple primaries –Migration artifacts CONs –Velocity model? –Moveout function? –Interactive mute –Inner angles –RT artifacts

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Summary WE prediction S/N separation Data RT & Mute Image Data NMO RT & Mute WE migration & ADCIG Image

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Summary Multiple attenuation after migration WE migration Angle gathers Cost/accuracy Complex propagation Cheap separation RT limitations filtering approach

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