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Velocity-independent $ tau$-$p$ moveout in a horizontally-layered VTI medium [pdf 748K]
Lorenzo Casasanta and Sergey Fomel
Local slopes of seismic events carry complete information about the structure of the subsurface. This information is sufficient for accomplishing all time-domain imaging tasks, without the need to estimate or know the seismic velocity model. We develop a velocity-independent $ $ -$ p$ imaging approach to perform moveout correction in horizontally-layered VTI media. The effective and interval anisotropic parameters turn into data attributes through the use of slopes and become directly mappable to the zero-slope traveltime. The $ $ -$ p$ transform is the natural domain for anisotropy parameter estimation in layered media, because the phase velocity is given explicitly in terms of $ p$ . Therefore, the $ $ -$ p$ transform allows for reflection-traveltime modeling and inversion that are simpler than traditional methods based on Taylor-series expansions of traveltime in $ t$ -$ X$ domain. Synthetic and field data tests demonstrate the practical effectiveness of our method.




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2011-06-25