Kinematic Invariants Describinh Locally Coherent Events: An Efficient and Flexible Approach to Non-Linear Tomography

Montel, J.; Deladerrière, N.; Guillaume, P.; Lambaré, Gilles; Prescott, Tony J.; Touré, J. P.; Traonmilin, Yann; Zhang, X.

doi:10.3997/2214-4609.201404975

Cited by 7 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the data processing of seismic surveys prestack migrations (PSM) have been performed for decades either as prestack time (PSTM) or prestack depth (PSDM) migrations (Yilmaz, 2001, Bednar, 2005, Robein 2010). The task of migration and demigration and demigration of interpreted reflection responses has been considered for almost twenty years (Chauris et al, 2002, Lambare et al, 2007, Montel et al, 2009, Messud et al, 2017. The presented approach builds on this pioneering work; in the next section it will be attempted to indicate where differences exist to previous publications and where new aspects are considered.…”

Section: Introductionmentioning

confidence: 99%

Kinematic aspects of residual prestack migration

Schneider¹

2017

SEG Technical Program Expanded Abstracts 2017

View full text Add to dashboard Cite

In this contribution it is shown that various aspects of the concept of residual migration can be utilized for the case that a prestack time or depth migration has been performed for a seismic survey and a new depth is available for subsequent processing: The concept of residual migration is introduced by determining travel times of reflected events for individual traces from aplanatic curves. These events are migrated in suitable configurations for the new velocity model for which a raytracing set as required for a Kirchhoff prestack depth migration is available. The resulting transformations can be utilized in various ways to estimate important parameters such as the positional bias of migrated events with respect to the corresponding zero offset position and the residual moveout for the new depth model; finally a new approach is suggested to estimate the aperture width over the Fresnel zone for the first prestack migration. Various mapped prestack migrations can be estimated, including a prestack time migration with eliminated positional bias. The necessity of a new prestack depth migration can be assessed from the aperture width over the first order Fresnel zone and from the positional bias at a particular offset. Additional kinematic parameters can be acquired for a residual prestack migration, in particular the curves over which the residual summation has to be performed. The approach is applicable to isotropic and anisotropic PSTM and PSDM. First applications are demonstrated with good results for a simple isotropic depth model with a laterally varying inhomogeneous velocity distribution with both isotropic and anisotropic PSTM and isotropic PSDM applications and for a vintage seismic survey. Computational costs of the implementation are low when compared to a full PSDM. In the appendix of the contribution a formula is derived for the migration velocities for a prestack time migration for small to intermediate source receiver offsets. The velocities can be determined either from an inhomogeneous anisotropic depth model or from residual moveout analyses of a previous migration; the application is demonstrated for an isotropic depth model.

show abstract

Section: Introductionmentioning

confidence: 99%

Kinematic aspects of residual prestack migration

Schneider¹

2017

SEG Technical Program Expanded Abstracts 2017

View full text Add to dashboard Cite

show abstract

“…In this case, they are called kinematic invariants (Guillaume et al, 2001). In this paper, we develop the extension of non-linear slope tomography (Guillaume et al, 2008;Montel et al 2009) to general 3D acquisitions like Multi Azimuth (MAZ) and Wide Azimuth (WAZ). It involves aspects related both to the slope tomography itself and the picking and kinematic demigration process.…”

Section: Introductionmentioning

confidence: 99%

Non-linear Slope Tomography – Extension to MAZ and WAZ

Montel¹,

Guillaume²,

Lambaré³

et al. 2010

72nd EAGE Conference and Exhibition Incorporating SPE EUROPEC 2010

Self Cite

View full text Add to dashboard Cite

“…As they consider local events they can be easily associated with dense automated dip and RMO picking tools (Siliqi et al, 2007). Slope tomography nicely improves grid tomography (Guillaume et al, 2008, Montel et al, 2009, Tieman et al, 2009) but so far it has not been extended to a multi-layer version. Our goal in this paper is to present the extension of non-linear slope tomography to the update of a multi-layer model (Results have been already presented in , but with very limited details on the algorithm).…”

mentioning

confidence: 99%

Multi-layer Non-linear Slope Tomography

Lambaré¹,

Guillaume²,

Zhang³

et al. 2013

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

Self Cite

View full text Add to dashboard Cite

Tomography algorithms using gridded model description and ray tracing have made continuous progress in terms of resolution and efficiency. However one strong limitation is the difficulty to recover strong velocity contrasts encountered in presence of salt bodies, chalk, basalt, carbonates… The conventional solution for velocity model building in such a context is to proceed in a top-down manner from one velocity contrast to the next one. In such a layer stripping approach velocities and horizons are updated layer after layer recursively from top to bottom. Such a workflow is time consuming and prone to velocity errors being propagated into deeper layers as the model building progresses. We present here a solution to remedy these drawbacks. Our solution involves a non-linear tomographic approach combining dense dip and residual move-out picks with horizons describing the main velocity contrasts. While dip and RMO picks are used to update 3D velocity grids inside each layer by non-linear slope tomography, the picked horizons describing layer boundaries are kinematically de-migrated and re-migrated recursively from top to bottom to reposition the major velocity contrasts after each velocity update. We present applications of the method to a marine North Sea dataset and to a land dataset with salt structures and compare the results with the layer stripping approach.

show abstract

Kinematic Invariants Describinh Locally Coherent Events: An Efficient and Flexible Approach to Non-Linear Tomography

Cited by 7 publications

References 0 publications

Kinematic aspects of residual prestack migration

Kinematic aspects of residual prestack migration

Non-linear Slope Tomography – Extension to MAZ and WAZ

Multi-layer Non-linear Slope Tomography

Contact Info

Product

Resources

About