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


Pubblicato il 19 feb 2016


More About ….

SEG 2020 – Evolve Student Program Updates

As in the 2019, when a group of UNIPG students won the participation to the SEG meeting in San Antonio (Texas), also this year another team of UNIPG students successfully accomplished the collaborative project SEG EVOLVE edition 2020, working remotely in collaboration with Engineering Students from the University of Leoben, Austria.

Thanks to an excellent performance during the final EVOLVE presentation in June, they got selected to join the International Society of Exploration Geophysicists (SEG) Annual Meeting to present their work.

read more

SEG Geophysics Field Camp in Southern Italy 2020

FIELD CAMP OUTLINE: the camp will be held in the so called Verteglia Plain (Montella, AV). This site represents a small sedimentary basin located at 1230 m a.s.l. on the Terminio Mount, an important carbonate structure of the Southern Apennines.

In this area, the highly karstified bedrock and the filling pyroclastic sediments characterize a complex and particular hydrogeological scenario. The aim of the field camp is therefore double: training activities on geophysical data acquisitions; detection of geological features of the site through different geophysical measurements.

read more

2019 Sclocchi Award: Awards Ceremony

We announce the winners for the 27th edition of the Sclocchi Award. A collaboration among SPE, EAGE and Assomineraria to reward excellent university graduates in Energy related disciplines.

read more

Epsilon and Delta in Anisotropic Velocity Model Building

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 European Association of Geoscientists and Engineers (EAGE) is a global professional, non-profit association for geoscientists and engineers. EAGE strives to promote innovation and technical progress and aims to foster communication and cooperation between those working in, studying or interested in these fields. To learn more about EAGE Education visit www.LearningGeoscience.org

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