Reverse time migration of multiples: Eliminating migration artifacts in angle domain common image gathers

Wang, Yibo; Zheng, Yikang; Zhang, Lele; Chang, Xu; Yao, Zhen‐Xing

doi:10.1190/geo2013-0441.1

Cited by 29 publications

(10 citation statements)

References 28 publications

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“…The DDM method for surface seismic data has been demonstrated by Wang et al (2014b). Using the source-receiver reciprocity theory, if the VSP data are resorted into common receiver gathers and the receiver in the borehole is taken as a source.…”

Section: Methodology Ddm For Vsp Datamentioning

confidence: 99%

“…The recorded data containing primaries and free-surface related multiples are backward-propagated as the receiver wavefield, and the recorded data, together with a synthetic wavelet, are forward-propagated as the source wavefield. Wang et al (2014b) isolate the contribution of multiples and name it as data-to-data migration (DDM), in which the recorded data containing primaries and free-surface related multiples are forward and backward propagated simultaneously. The algorithm is designed for surface seismic profile and can also be applied in the VSP data processing.…”

Section: Introductionmentioning

confidence: 99%

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VSP Imaging Using Free-Surface Multiples With Wavefield Decomposition: Synthetic and Field Data Examples

2021

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Vertical seismic profiling (VSP) is an effective technique to provide high-resolution seismic images of the reservoir area. However, the quality of the images is limited by the poor illumination of primary reflection wave. In conventional VSP imaging, only the upgoing primaries are used. Adding free-surface–related multiples into the imaging process can significantly improve the coverage of the illuminated area. Conventional migration methods using multiples need the complex process of multiple prediction. Data-to-data migration (DDM) is an effective imaging technique for multiples in which the recorded data is migrated directly. To improve the imaging quality of DDM in VSP imaging, we propose separating the wavefield into downgoing and upgoing components using Hilbert transform when reverse-time migration (RTM) is implemented in DDM, and the inverse-scattering imaging condition is further applied to the decomposed wavefields. The proposed method eliminates low-frequency noises and false images generated from the conventional cross-correlation imaging condition, and further enhance the illumination in the VSP imaging. Synthetic examples and application to a walkaway field data demonstrate that it can attenuate the noise and improve the imaging resolution effectively. By using DDM with inverse scattering imaging condition and wavefield decomposition based on Hilbert transform, VSP imaging using free-surface–related multiples becomes a practical complement for conventional VSP imaging.

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Section: Methodology Ddm For Vsp Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

VSP Imaging Using Free-Surface Multiples With Wavefield Decomposition: Synthetic and Field Data Examples

2021

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“…Several schemes have been proposed to remove the artefacts arising from free-surface and internal multiple reflections. Some focus on free-surface and internal multiple elimination in data domain (Weglein et al 1997;, some attempt to use free-surface multiple reflections as useful signals to image the subsurface (Brown & Guitton 2005) or eliminate free-surface multiple reflection related artefacts in the imaging domain (Wang et al 2014(Wang et al , 2017.…”

Section: Introductionmentioning

confidence: 99%

A fast algorithm for multiple elimination and transmission compensation in primary reflections

Zhang

Slob

2020

Geophysical Journal International

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SUMMARY The transmission compensated primary reflections can be obtained from the single-sided acoustic reflection response in the two-way traveltime domain. This is achieved by eliminating free-surface and internal multiple reflections and compensating for transmission losses in primary reflections without model information. The substantial computational cost of the proposed scheme can be reduced by an order of magnitude with a fast implementation version. This is achieved by using the previously computed filter functions as initial estimate for every new truncation time value. We evaluate the success of the scheme with simple and complex 2-D numerical examples. We find that the scheme has excellent performance in most cases, except for the case where strong reflectors are present. In such case, the current scheme suffers from lack of convergence.

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“…The performance of these schemes in 2D numerical data has been illustrated (Zhang and Staring, 2018), and the application to field data has not yet been realized. Wang et al (2014Wang et al ( , 2017 propose to eliminate artifacts due to reverse time migration of free-surface-related multiples in angle-domain common-image gathers or using the wavefield decomposition imaging condition. The success has been validated by numerical examples.…”

Section: Introductionmentioning

confidence: 99%

Free-surface and internal multiple elimination in one step without adaptive subtraction

Zhang

Slob

2019

GEOPHYSICS

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We have derived a scheme for retrieving the primary reflections from the acoustic surface-reflection response by eliminating the free-surface and internal multiple reflections in one step. This scheme does not require model information and adaptive subtraction. It consists only of the reflection response as a correlation and convolution operator that acts on an intermediate wavefield from which we compute and capture the primary reflections. For each time instant, we keep one value for each source-receiver pair and store it in the new data set. The resulting data set contains only primary reflections, and from this data set, a better velocity model can be built than from the original data set. A conventional migration scheme can then be used to compute an artifact-free image of the medium. We evaluated the success of the method with a 2D numerical example. The method can have a wide range of applications in 3D strongly scattering media that are accessible from one side only.

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Reverse time migration of multiples: Eliminating migration artifacts in angle domain common image gathers

Cited by 29 publications

References 28 publications

VSP Imaging Using Free-Surface Multiples With Wavefield Decomposition: Synthetic and Field Data Examples

VSP Imaging Using Free-Surface Multiples With Wavefield Decomposition: Synthetic and Field Data Examples

A fast algorithm for multiple elimination and transmission compensation in primary reflections

Free-surface and internal multiple elimination in one step without adaptive subtraction

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