Compensating for source and receiver ghost effects in reverse time migration

Roberts, Gareth; Khalil, A.

doi:10.1190/segam2012-0626.1

Cited by 16 publications

(7 citation statements)

References 5 publications

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“…Zhang et al (2012) then demonstrate that compensating ghost effects leads to reliable recovery of the low frequency components in the image, which are important for seismic inversion. v(x), and density, (x), variations:…”

Section: Theorymentioning

confidence: 97%

“…These can be compensated during the wave propagation of RTM by modifying the boundary conditions in Equations 1 and 2 as follows (Zhang et al, 2012):…”

Section: Theorymentioning

confidence: 99%

“…RTM is conventionally used as a tool for imaging the reflectivity or the interfaces of the subsurface geology. Recently the concept of ghost compensation, as proposed by Zhang et al (2012), also brings the possibility of estimating the velocity perturbation of the geology so using RTM for seismic inversion. The method extends the low frequency bandwidth of the image by removing the source and receiver ghosts during conventional RTM.…”

Section: Introductionmentioning

confidence: 99%

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Velocity and impedance inversion based on true amplitude reverse time migration

Ratcliffe

Duan

Roberts

2013

SEG Technical Program Expanded Abstracts 2013

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Conventional methods of pre-stack depth imaging aim at producing a structural image that delineates the interfaces of the geological variations, or the reflectivity of the earth. With the help of broadband acquisition and processing techniques, the bandwidth gap between depth imaging and seismic inversion is reducing. We outline theory that shows how angle domain common image gathers produced by a true amplitude reverse time migration can estimate impedance and velocity perturbations. The near angle stacked image provides the impedance perturbation estimate, while the far angle image can be used to estimate the velocity perturbation. We show how this theory can be incorporated into a full waveform inversion framework and demonstrate it on synthetic and real data, showing that useful and reliable information is obtained for interpreting geological structures and rock properties.

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Section: Theorymentioning

confidence: 97%

“…These can be compensated during the wave propagation of RTM by modifying the boundary conditions in Equations 1 and 2 as follows (Zhang et al, 2012):…”

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Velocity and impedance inversion based on true amplitude reverse time migration

Ratcliffe

Duan

Roberts

2013

SEG Technical Program Expanded Abstracts 2013

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“…Simulation of the ghost with a free surface-boundary condition in forward and backward wave propagation, along with an adjusted imaging condition (Zhang et al, 2012), allows FWI and RTM to compensate for the ghost present in the acquired seismic data. Although RTM is now the preferred imaging algorithm because of its superior accuracy for complex salt geometry (compared with traditional ray-based Kirchhoff migration), subsalt imaging still remains a significant challenge.…”

Section: Introductionmentioning

confidence: 99%

A robust imaging workflow to take advantage of long-offset broadband data acquisition

et al. 2014

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In the past decade, marine seismic acquisition has evolved from narrow-azimuth (NAZ) to wide-azimuth (WAZ) geometries toward the latest offering of long-offset full-azimuth (FAZ) surveys with slanted cables. This broadband long-offset acquisition design is driven mainly by the demands of improved illumination in complex areas such as Gulf of Mexico (GOM) subsalt environments. Two-way wave-equation algorithms, such as reverse time migration (RTM) and fullwaveform inversion (FWI), are required to optimally use these improved data. Their high-fidelity nature enables them to honor complex velocity fields with the accuracy required, particularly for migrating long-offset data and, as a result, for producing satisfactory model refinements and images when other methods fail. To achieve image improvements, an efficient workflow has to be established to maximize the power of broadband long-offset acquisition by applying velocity model building with FWI, imaging with RTM compensation for ghost effects in both steps, and outputting partial images for further image optimization. With the best acquisition and imaging algorithms, RTM images can be improved further by postimaging enhancements using vector image partitions (VIP) in the GOM.

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“…Indeed, RTM is conventionally used as a tool for imaging the reflectivity or the interfaces of the subsurface geology. Recently, the concept of ghost compensation proposed by Zhang et al (2012) brings the possibility of estimating the velocity perturbation of the geology using RTM for seismic inversion. The method extends the low frequency bandwidth of the image by removing the source and receiver ghosts during the conventional RTM.…”

Section: Introductionmentioning

confidence: 99%

True Amplitude Reverse Time Migration - From Reflectivity to Velocity and Impedance Perturbations

Duan¹,

Zhang²,

Roberts³

2013

London 2013, 75th Eage Conference en Exhibition Incorporating SPE Europec

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SUMMARY____________________________________________________________Conventional prestack depth imaging methods aim at producing a structural image, which delineates the interfaces of the geological variations or the reflectivity of the earth. With the help of broadband acquisition and processing techniques, the bandwidth gap between depth imaging and seismic inversion is reducing. Here, we propose a theory to show how impedance and velocity perturbations can be estimated from the angle domain common image gathers produced by a true amplitude reverse time migration. The near angle stacked image provides the impedance perturbation estimate, while the far angle images can be used to estimate the velocity perturbation. Together with the ghost compensation technique, the method described here can be a useful tool of seismic inversion for marine exploration. Both synthetic and real data examples have demonstrated that the method is reliable and provides additional information for interpreting geological structures and rock properties.

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Compensating for source and receiver ghost effects in reverse time migration

Cited by 16 publications

References 5 publications

Velocity and impedance inversion based on true amplitude reverse time migration

Velocity and impedance inversion based on true amplitude reverse time migration

A robust imaging workflow to take advantage of long-offset broadband data acquisition

True Amplitude Reverse Time Migration - From Reflectivity to Velocity and Impedance Perturbations

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