1887

Abstract

Tomographic methods for the determination of velocity models using kinematic wavefield attributes strongly depend on the accuracy of the attributes. The Common-Reflection-Surface method applied to prestack data provides the attributes already with high quality. However, one difficulty of the CRS method is the treatment of diffractions and triplications, especially when located close to reflections. In such areas the quality of the attributes is not sufficient and, therefore, velocity model building with Normal Incident Point wave tomography does not provide an optimum result. Thus, it is reasonable to extract the kinematic wavefield attributes in the time-migrated domain. The Common-Reflection-Surface method applied to the time-migrated data approximates the zero-offset traveltime as a second-order Taylor expansion in the vicinity of the image ray. The data vector for the inversion contains the wavefront curvatures of the image rays. The model vector is calculated by dynamic ray-tracing along central image rays. The inversion problem is solved iteratively by computing the least-squares solution to the locally linearized problem during each iteration step. The required Frechet derivatives for the tomographic matrix are calculated with ray perturbation theory.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.20149476
2011-05-23
2024-03-28
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20149476
Loading
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error