Understanding subsalt illumination through ray-trace modeling, Part 1: Simple 2-D salt models

Muerdter, David R.; Ratcliff, Davis W.

doi:10.1190/1.1438998

Cited by 57 publications

(24 citation statements)

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“…However, there are situations in which it may be preferable to choose a different geometry including the slanted geometry, the zigzag geometry, and other target-oriented geometries (Campbell et al, 2002;Muerdter and Ratcliff, 2001). For marine streamer acquisition, the parallel geometry is the only choice.…”

Section: Spatial Continuity Distribution Of Offset-vector Samplingmentioning

confidence: 99%

Quantitative regularity analysis of offset-vector sampling for seismic acquisition geometry

Wei

2012

ASEG Extended Abstracts

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Section: Spatial Continuity Distribution Of Offset-vector Samplingmentioning

confidence: 99%

Quantitative regularity analysis of offset-vector sampling for seismic acquisition geometry

Wei

2012

ASEG Extended Abstracts

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“…Imaging the subsalt area is a challenging problem because seismic wavefields are strongly distorted when propagating through the high-velocity salt bodies. The salt body can significantly block the energy, creating uneven illumination and shadow zones (Jackson et al, 1994;Muerdter and Ratcliff, 2001;Leveille et al, 2011;Liu et al, 2011). In such critical subsalt areas, valuable signals are diminished further and are weaker than the artifacts elsewhere.…”

Section: Introductionmentioning

confidence: 98%

Staining algorithm for seismic modeling and migration

Chen

Jia

2014

GEOPHYSICS

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In seismic migration, some structures such as those in subsalt shadow zones are not imaged well. The signal in these areas may be even weaker than the artifacts elsewhere. We evaluated a method to significantly improve the signalto-noise ratio (S/N) in poorly illuminated areas of the model. We constructed a "phantom" wavefield: an extension of the wavefield to the complex domain. The imaginary wavefield was synchronized with the real wavefield, but it contained only the events relevant to a target region of the model, which was specified using a staining algorithm. The real wavefield interacted with the entire model. However, all structures except for the target were transparent to the imaginary wavefield, which is excited only when the real wavefront arrives at the target structure. The real and the imaginary source wavefields were crosscorrelated with the regular receiver wavefield. The results were revealed in two images: the conventional reverse time migration image and an image of the target region only. Synthetic experiments showed that the S/N of the target structures was improved significantly, with other structures effectively muted.

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“…To calculate illumination, a fictitious plane reflector with a dipping angle and a unit (or constant) reflectivity is usually required (Muerdter and Ratcliff 2001a). Using plane-wave superposition principle, we can generalize the idea into an arbitrary non-flat reflector.…”

Section: Illumination Analysis With Adjoint State Methodsmentioning

confidence: 99%

Illumination and Resolution Analyses on Marine Seismic Data Acquisitions by the Adjoint Wavefield Method

Chen²

2012

Terr. Atmos. Ocean. Sci.

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We applied a wave-equation based adjoint wavefield method for seismic illumination and resolution analyses. A twoway wave-equation is used to calculate directional and diffracted energy fluxes for waves propagating between sources and receivers to the subsurface target. The first-order staggered-grid pressure-velocity formulation, which lacks the characteristic of being self-adjoint is further validated and corrected to render the modeling operator before its practical application. Despite most published papers on synthetic kernel research, realistic applications to two field experiments are demonstrated and emphasize its practical needs. The Fréchet sensitivity kernels are used to quantify the target illumination conditions. For realistic illumination measurements and resolution analyses, two completely different survey geometries and nontrivial pre-conditioning strategies based on seismic data type are demonstrated and compared. From illumination studies, particle velocity responses are more sensitive to lateral velocity variations than pressure records. For waveform inversion, the more accurately estimated velocity model obtained the deeper the depth of investigation would be reached. To achieve better resolution and illumination, closely spaced OBS receiver interval is preferred. Full waveform approach potentially provides better depth resolution than ray approach. The quantitative analyses, a by-product of full waveform inversion, are useful for quantifying seismic processing and depth migration strategies.

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Understanding subsalt illumination through ray-trace modeling, Part 1: Simple 2-D salt models

Cited by 57 publications

References 0 publications

Quantitative regularity analysis of offset-vector sampling for seismic acquisition geometry

Quantitative regularity analysis of offset-vector sampling for seismic acquisition geometry

Staining algorithm for seismic modeling and migration

Illumination and Resolution Analyses on Marine Seismic Data Acquisitions by the Adjoint Wavefield Method

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