EAGE E-Lecture: Epsilon and Delta in Anisotropic Velocity Model Building by Etienne Robein

The objective of seismic imaging is to get a sharp and accurate image of the elastic reflectivity in the subsurface, especially in complex geological settings. By ‘accurate’, we mean that reflectors should be at the right depth, but also correct lateral position.
The accuracy of a Pre-Stack Depth Migration image goes together with our ability to estimate the velocity at which waves propagate in the subsurface. To build such a Velocity Model remains a challenge because the earth is not only heterogeneous (waves propagate at different velocities at different locations), but also anisotropic (propagation velocity is a function of propagation direction).
The presentation discusses the physical meaning of Thomsen’s parameters epsilon and delta included in the Model to describe anisotropy. It illustrates a popular method to estimate them in a Pre-Stack Depth Migration project to conclude that borehole calibration is a necessary step to achieve the best accuracy possible.

This video is part of EAGE Online Education Programme.

The following courses by Etienne Robein are available via EAGE:

- Seismic Imaging: A Review of the Techniques, their Principles, Merits and Limitations (EET 4)
- Seismic Depth Imaging and Anisotropic Velocity Model Building

Consult our Calendar or Events for the next deliveries or request an in-house training proposal!

[Vandemataram-]

This is a very nice lecture and vividly explained...Thanks for this.

[rickdelpino]

Excellent explanation! Greetings from Bolivia.

[enzodaniellunacarabajal]

Thanks, for your presentation. Very good explanation.

[zanetaszymanska-maysa]

Thank you for the presentation which is easy to understand!

[bvbabu]

very nice for understanding for epsilon and delta