Can We Correct for Azimuthal Variations of Residual Moveout in Land WAZ Context Using Depth Non-linear Slope Tomography?

Zimine, S.; Lambaré, Gilles; Guillaume, P.; Montel, J.; Touré, J. P.; Deladerrière, N.; Zhang, X.; Prescott, A.; Lecerf, D.; Navion, Sylvain; Boëlle, Jean-Luc; Belmokhtar, Ahmed; Ladmek, Abdeljebbar

doi:10.3997/2214-4609.201400655

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“…In the frame of migration velocity analysis this firstly imposes to develop tools for picking azimuthal residual moveout (RMO) (Lecerf et al, 2009;Siliqi and Talaalout, 2009). The second need is to have adequate tools allowing tomographic update of the velocity suitable to handle WAZ acquisition (Montel et al, 2010;Zimine et al, 2010). Using such tools it becomes possible to investigate WAZ velocity model building addressing the problem of azimuthal anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Azimuthal anisotropy? The time and depth imaging points of view: an imaging case history

Lambaré¹,

Zimine²,

Guillaume³

et al. 2010

72nd EAGE Conference and Exhibition - Workshops and Fieldtrips

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The superior imaging capabilities of wide azimuth (WAZ) are now well established. Processing such acquisitions requires adaptation of the processing workflows and tools. For example the recorded azimuthal information must be kept and the tools should be able to deal with the increased amount of data. Concerning the velocity model building, a question remains on the need of introducing azimuthal anisotropy. In this paper we address this point with a time and depth imaging case study for a high density wide azimuth (WAZ) land surface acquisition. We show on this dataset that azimuthally varying residual move-out observed on time migrated common image gathers (CIG) definitely disappears on depth migrated CIGs (in both cases no azimuthal anisotropy is introduced in the velocity model). This illustration highlights the limits of the assumptions of time imaging, thus promoting the use of depth imaging when processing high-density WAZ data, even in the context of mild geological complexity.

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