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|Type:||Artigo de periódico|
|Title:||On The Application Of True-amplitude Dmo|
|Abstract:||Constant-velocity, true-amplitude migration to zero offset (MZO) is broken into two cascaded operations: (a) standard normal moveout (NMO) and (b) true-amplitude dip moveout (DMO) corrections. The output of the sequence NMO and true amplitude DMO applied to a constant-offset (CO) section is a simulated zero-offset (ZO) section, in which the geometrical spreading of primary reflections is the same as would be observed in a real experiment. For constant velocity, 3-D true-amplitude DMO can be carried out by two-dimensional, in-line Kirchhoff-type stacking. Moreover, both the stacking curve and weights are given analytically by means of simple formulas. For inhomogeneous media, we extend the algorithm by replacing both in the previous stacking curve and in the weight formulas the original constant velocity by the NMO velocity at the output point. At least for mild lateral velocity variations, this approach offers an efficient approximation to full MZO as it avoids expensive dynamic ray-tracing computations. Synthetic and real seismic data examples are presented.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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