S-ray Approximation Tomography for PP and PS Horizon Co-Depthing

D'Afonseca, Luis; Dumett, M.; Birkeland, O.J.; Guillaume, P.; Krishnasamy, Terence; Santiago, Tânia M.G.; Guerra, Claudio

doi:10.3997/2214-4609.20140648

Cited by 5 publications

(2 citation statements)

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“…Defocusing is caused by a residual sloping up (Figure 7b, left) and down (Figure 7b, right) of energy in the CIGs, resulting in amplitude cancellation after stack. These slopes, supplied to a joint PP-PS inversion with codepthing constraints (D'Afonseca et al, 2014), can produce an anisotropy update that will result in better PP and PS images. Moreover, because of the asymmetric nature of PS propagation, stacks from opposite azimuthal directions can show image misalignments that can be used as additional constraints in a tomographic inversion.…”

Section: Ps Model Buildingmentioning

confidence: 99%

“…V S then is obtained by imposing a 1D vertical codepthing constraint and inversion. In complex geology, a ray-based solution (D'Afonseca et al, 2014) can obtain a more plausible V S field by imposing codepthing in a 3D sense. In addition, a 3D displacement field that describes the relative shifts between events on the PP and PS CIGs can be incorporated as an additional constraint into a tomographic inversion (Mathewson et al, 2013).…”

Section: Ps Model Buildingmentioning

confidence: 99%

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PS imaging of ocean-bottom data

Casasanta

Gray

2015

The Leading Edge

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Opportunities and challenges exist for imaging seismic data acquired using conventional marine sources and receivers on the seafloor. Compared with conventional imaging of sea-surface streamer data, seabed acquisition and processing offer some opportunities to provide higher value of information. One of the opportunities is to use P-wave to S-wave converted reflection energy (PS imaging). Challenges include overcoming the effects of current seafloor receiver spacing, which can be large enough to negate the promised resolution gains and complicate the velocity model-building workflow. A synthetic data set illustrates possible imaging improvements that can result from seafloor acquisition as well as image degradation that can result when seafloor receivers are separated by typical current distances.

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Section: Ps Model Buildingmentioning

confidence: 99%

Section: Ps Model Buildingmentioning

confidence: 99%