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|Type:||Artigo de periódico|
|Title:||Obtaining AVO and AVA curves from CRS attributes|
|Abstract:||We present a method to obtain amplitude-versus-offset (AVO) and amplitude-versus-angle (AVA) curves at selected depth points using the three attributes generated by the Common Reflection Surface (CRS) stack: the emergence angle and the two hypothetical wavefront curvatures associated to each zero-offset ray simulated. Our approach combines the CRS stack/inversion process applied to multicoverage data and the use of a kinematic Kirchhoff migration to achieve true-amplitudes (TA) at assigned depth points in the migrated images. The proposed method consists of the following steps: (i) apply the CRS process to the given multicoverage data; the obtained CRS attributes are then used to produce a simple macro-velocity depth model; (ii) perform an unweighted Kirchhoff migration for imaging purposes only; for selected points on target reflectors in the migrated image, we use ray tracing within the macro-velocity model to determine, by ray tracing, common-reflection-point (CRP) gathers that belong to the input data; for these rays, we compute the incident angles and the geometrical spreadings, (iii) go back to CRP gathers and compensate the amplitudes for geometrical spreading. The whole process permits to construct AVA curves on the assigned CRP's, In summary, our method is designed to aggregate amplitude information on selected points of a reflector, after a purely kinematic image (migration) has been obtained. The method is tested on a synthetic inhomogeneous layered model with encouraging results.|
Common Reflection Surface
|Citation:||Journal Of Seismic Exploration. Geophysical Press, v. 10, n. 41699, n. 19, n. 29, 2001.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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