3-D AVO migration/inversion of field data

Tura, Ali; Hanitzsch, C.; Calandra, Henri

doi:10.1190/1.1437898

Cited by 28 publications

(14 citation statements)

References 4 publications

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“…With such an approach, computation time for PAPsDM is slightly greater than the one needed for kinematic PsDM (which cannot handle any reliable amplitude information), but it introduces a practical method for 3-D migration-based AVO analysis (Tura et al, 1997) since it can be transformed easily into ray+Kirchhoff common-offset migration.…”

Section: Resultsmentioning

confidence: 99%

“…It provides extremely fast algorithms for kinematic migration (Reshef, 1991;Mufti et al, 1996;Noble et al, 1996). Yet, since no reliable amplitude information is incorporated in this kinematic approach, migration-based amplitude variation with offset (AVO) analysis cannot be performed (Beydoun et al, 1993;Tura et al, 1997). Moreover, complex structure imaging is often unsuccessful when based only on first-arrival traveltimes (Geoltrain and Brac, 1993).…”

Section: Introductionmentioning

confidence: 98%

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3-D preserved amplitude prestack depth migration on a workstation

et al. 1999

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

3-D preserved amplitude prestack depth migration on a workstation

et al. 1999

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“…We introduced a new hybrid method for a broadband imaging of the Q-factor contrast in depth. Our approach for estimating the Q factor is analogous to the idea of combining tomography and migration, proposed for seismic reflectivity by Mora (1989) and by Tura et al (1998) for AVO attributes. It resembles also a classic, popular approach for estimating the acoustic impedance from seismic traces (Lavergne 1975;Lindseth 1976;Lavergne and Willm 1977;Becquey et al 1979), where the low-frequency trend is provided by stacking velocities, while the high-frequency component comes from the deconvolved traces.…”

Section: Discussionmentioning

confidence: 99%

Broad-band viscoacoustic Q-factor imaging by seismic tomography and instantaneous frequency

Lin

Vesnaver

Böhm

et al. 2018

Geophysical Journal International

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Recent advances in seismic acquisition and processing allowed enhancing significantly the imaging resolution, mainly by broadening the signal bandwidth towards the lower frequencies. So far, however, frequencies lower than a few Hz cannot be obtained by standard surveys, and this gap is normally filled by estimating those components using velocity analysis. In this paper we propose a similar approach for imaging the anelastic absorption, i.e., by merging a low-frequency component given by reflection tomography with the high-frequency component derived from the instantaneous frequency. First, a macro-model in depth is built by traveltime and Q-factor tomography; then, this model is combined with the high-frequency component obtained from the depth migrated instantaneous frequency. We get so a broadband Earth model for the Q factor, using a consistent velocity field provided by the traveltime inversion of direct and reflected arrivals. This new hybrid method is applied to a 2D synthetic example.

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“…The wavefront construction method has already been used intensively for 2-D migration (Moser and Pajchel, 1995;Thierry and Lambaré, 1995;Ettrich and Gajewski, 1996) and such applications will certainly develop in the coming years especially in the 3-D case (Thierry et al, 1996;Operto et al, 1997;Tura et al, 1997). Interfaces can be incorporated into the wavefront construction method (Vinje et al, 1993a(Vinje et al, , 1995Moser and Pajchel, 1997), although this strategy yields a very significant increase in computational cost and algorithmic complexity.…”

Section: Ray Tracing For Imagingmentioning

confidence: 99%

Fast 2-D ray+Born migration/inversion in complex media

1999

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In this paper, we evaluate the capacity of a fast 2-D ray+Born migration/inversion algorithm to recover the true amplitude of the model parameters in 2-D complex media. The method is based on a quasi-Newtonian linearized inversion of the scattered wavefield. Asymptotic Green's functions are computed in a smooth reference model with a dynamic ray tracing based on the wavefront construction method. The model is described by velocity perturbations associated with diffractor points. Both the first traveltime and the strongest arrivals can be inverted. The algorithm is implemented with several numerical approximations such as interpolations and aperture limitation around common midpoints to speed the algorithm. Both theoritical and numerical aspects of the algorithm are assessed with three synthetic and real data examples including the 2-D Marmousi example. Comparison between logs extracted from the exact Marmousi perturbation model and the computed images shows that the amplitude of the velocity perturbations are recovered accurately in the regions of the model where the ray field is single valued. In the presence of caustics, neither the first traveltime nor the most energetic arrival inversion allow for a full recovery of the amplitudes although the latter improves the results. We conclude that all the arrivals associated with multipathing through transmission caustics must be taken into account if the true amplitude of the perturbations is to be found. Only 22 minutes of CPU time is required to migrate the full 2-D Marmousi data set on a Sun SPARC 20 workstation. The amplitude loss induced by the numerical approximations on the first traveltime and the most energetic migrated images are evaluated quantitatively and do not exceed 8% of the energy of the image computed without numerical approximation. Computational evaluation shows that extension to a 3-D ray+Born migration/inversion algorithm is realistic.

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3-D AVO migration/inversion of field data

Cited by 28 publications

References 4 publications

3-D preserved amplitude prestack depth migration on a workstation

3-D preserved amplitude prestack depth migration on a workstation

Broad-band viscoacoustic Q-factor imaging by seismic tomography and instantaneous frequency

Fast 2-D ray+Born migration/inversion in complex media

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