True-amplitude seismic imaging

Protasov, M.; Cheverda, V. A.

doi:10.1134/s1028334x06030214

Cited by 12 publications

(3 citation statements)

References 4 publications

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“…The beam-waist can also be placed at other positions along the beam, for example at a sub-surface scattering point. Recent true amplitude migration formulations using Gaussian beams have used beams traced from the scattering points up to the surface with the beamwaists specified at the scattering points (Protasov and Cheverda, 2005;2006). However, it is more economical to launch beams from the source and receiver positions down into the subsurface since there are fewer source and receiver locations than subsurface scattering points, and this minimizes the amount of beam tracing required.…”

Section: Overview Of Gaussian Beammentioning

confidence: 99%

Focused gaussian beams for seismic imaging

Nowack

2008

SEG Technical Program Expanded Abstracts 2008

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The application of focused Gaussian beams is investigated for the seismic imaging of common-shot reflection data. The focusing of Gaussian beams away from the source and receiver surface adds flexibility to beam imaging algorithms allowing for the narrowest portions of the beams to occur at the depth of a specific target structure. This minimizes the number of beams required to form an image at the target depth. The beam fronts at the beam-waists are also planar leading to more stable beam summations for imaging. To match with the surface data, a quadratic phase correction is required for the local slant-stacks of the data. Also, to use the same local slant stacks of the data for the different imaging depths, only a single focusing depth can be specified. Imaging using focused Gaussian beams is tested using a single shot gather for a model with 5 scatterers at different depths. The approach is then tested for a single shot gather from the Sigsbee2A model. In all cases, the beams can be focused to a particular target depth, but proper imaging still results for other depths as well.

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Section: Overview Of Gaussian Beammentioning

confidence: 99%

Focused gaussian beams for seismic imaging

Nowack

2008

SEG Technical Program Expanded Abstracts 2008

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“…This has the appearance of an image from a single nondiffracting beam, but since Gaussian beams generally diffract this is really a composite image for Gaussian beams with multiple imaging depths for a single central beam. Nonetheless, this type of imaging can be important with certain true amplitude formulations where planar and localized beams are required at the imaging points in the subsurface [20,21]. These formulations originally involved launching beams directly from the scattering points in the subsurface up to the surface [18].…”

Section: Applications Of Dynamically Focused Gaussian Beam Migrationmentioning

confidence: 99%

“…This reduces the number of beams required for the summation at the receiver, and also planar beam fronts at the receiver provide more stable beam summations. Recent true amplitude migration formulations using Gaussian beams have used beams launched directly from the scattering points up to the surface with the beam waists specified at the scattering points [18,20,21]). However, it is more economical to launch beams from the source and receiver positions down into the subsurface since there are fewer source and receiver locations than subsurface scattering points, and this minimizes the amount of beam tracing required.…”

Section: Gaussian Beam Imaging With Dynamically Focused Beamsmentioning

confidence: 99%

Dynamically Focused Gaussian Beams for Seismic Imaging

Nowack

2011

International Journal of Geophysics

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An initial study is performed in which dynamically focused Gaussian beams are investigated for seismic imaging. Focused Gaussian beams away from the source and receiver plane allow the narrowest and planar portions of the beams to occur at the depth of a specific target structure. To match the seismic data, quadratic phase corrections are required for the local slant stacks of the surface data. To provide additional control of the imaging process, dynamic focusing is investigated where all subsurface points are specified to have the same planar beam fronts. This gives the effect of using nondiffracting beams, but actually results from the use of multiple focusing depths for each Gaussian beam. However, now different local slant stacks must be performed depending on the position of the subsurface scattering point. To speed up the process, slant stacking of the local data windows is varied to match the focusing depths along individual beams when tracked back into the medium. The approach is tested with a simple model of 5-point scatterers which are then imaged with the data, and then to the imaging of a single dynamically focused beam for one shot gather computed from the Sigsbee2A model.

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Seismic Inversion After Depth Migration

Protasov

Dmitrachkov

2022

Computational Science and Its Applications – ICCSA 2022

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True-amplitude seismic imaging

Cited by 12 publications

References 4 publications

Focused gaussian beams for seismic imaging

Focused gaussian beams for seismic imaging

Dynamically Focused Gaussian Beams for Seismic Imaging

Seismic Inversion After Depth Migration

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