Education Days Buenos Aires

3 - 4 April
Buenos Aires, Argentina
Call for papers
 Date Title  Instructor(s) Duration
 3 - 4 April 2019 An Introduction to Velocity Model Building  Dr Ian Jones
 2 Days
 3 - 4 April 2019 Understanding Seismic Anisotropy in Exploration and Exploitation: Hands On  Dr Leon Thomsen  2 Days



Courses Descriptions

An Introduction to Velocity Model Building

Dr Ian Jones

Course description

The course will begin with a review of migration theory, emphasizing those aspects that affect our ability to build a velocity model of the subsurface and indicating when time migration should be replaced with depth migration (and what specific type of depth migration should be used). Ray theory and wave theory will be mentioned, in terms of how the scale length of a velocity anomaly versus the wavelength of the sound illuminating interacts. We will then cover the motivations for building detailed velocity models and briefly discuss the inherent limitations on our ability to build a detailed model. A review of anisotropy and of the principles of tomographic inversion will be given and current-day practice will be covered, exemplified via several case-studies. The approach will not be mathematical but rather will try to concentrate on an intuitive understanding of the principles and demonstrate them via case histories. This course will try to provide a complete overview but some topics such as VSP and multi-component data will not be covered.

Participants' profile

Geophysicists with an interest in migration and velocity model building and geologists (with a basic knowledge of data processing) who wish to understand a bit more about how the images they look at are created.


Participants should have some knowledge of basic data processing.

About the Instructor  

Ian F. Jones received a joint honours BSc in Physics with Geology from the University of Manchester, UK, in 1977, an MSc in Seismology from the University of Western Ontario, Canada, and a PhD in Geophysical Signal Processing from the University of British Columbia, Canada. After working for ‘Inverse Theory & Applications Inc.’ in Canada for two years, he joined CGG, where for 15 years he was involved in R&D in the London and Paris offices, latterly as manager of the depth imaging research group. Since 2000 he has been with ION GX Technology, as a Senior Geophysical Advisor in their London office.

His interests include velocity model building and migration, and his most recent activity includes writing the text books: ‘Velocities, Imaging, and Waveform Inversion: the evolution of characterising the Earth’s subsurface’ published by the EAGE in 2018; ‘An Introduction to Velocity Model Building’ published by the EAGE in 2010; and co-editing the SEG Geophysics Reprints series volumes ‘Classics of Elastic Wave Theory’ and also ‘Pre-Stack Depth Migration and Velocity Model Building’, as well as contributing the chapter on model building to the new SEG online encyclopaedia.

He is an associate editor for the journals ‘Geophysics’ and ‘Geophysical Prospecting’, and teaches the EAGE/PESGB/SEG continuing education course on ‘Velocity Model Building’ and is an external lecturer at the University of Leeds and Imperial College London. Ian was awarded the EAGE’s Anstey Medal in 2003 for contributions to the depth imaging literature, made the SEG European Honorary Lecturer in 2012, conducted the 2018-2019 EAGE international Education Tour, and was made an Honorary Life Member by the EAGE in 2018.


 Understanding Seismic Anisotropy in Exploration and Exploitation: Hands On 

 Dr Leon Thomsen (Houston, TX, United States) 

 Course description

 This course covers all areas of applied seismic anisotropy, with class exercises and ample time for full discussion. Because anisotropy is such a        undamental concept, it covers topics in seismic acquisition, processing, imaging and interpretation, all based on seismic rock physics. 


Participants' profile

 Geophysicists should attend who have a working knowledge of conventional exploration geophysics and wonder how it can be that we use isotropic concepts to acquire and analyze data that come from rocks that, after only brief thoughtful consideration, must clearly be anisotropic. 

Course objectives 

This is not a “methods course” but rather a “concept course”, familiarizing the students with essential concepts, enabling them to ask the right questions in future conversations, rather than to operate particular software packages. 

About the instructor

Leon Thomsen holds titles of Chief Scientist at Delta Geophysics, Research Professor at the University of Houston, and Visiting Scientist at Lawrence Berkeley National Laboratory. He holds a B.S. in geophysics from California Institute of Technology (Pasadena), and a Ph.D. in geophysics from Columbia University (New York). He held postdoctoral positions at Centre Nationale de la Recherche Scientifique (Paris), International Business Machines (Palo Alto), and Caltech. He was Assistant, then Associate Professor at the State University of New York (Binghamton), with sabbatical positions at Goddard Institute for Space Studies (New York) and the Australian National University (Canberra).
Leon"s industrial career began in 1980, at Amoco"s famous research center in Tulsa, where he was the Amoco inventor of what we now call seismic AVO. He led significant revisions to the exploration seismic paradigm, helping to establish the basic ideas of polar anisotropy and azimuthal anisotropy. His 1986 paper, establishing the modern field of seismic anisotropy, is the single-most-cited paper in the history of Geophysics; a Google search of the term ˆThomsen parameter" returns over 300,000 hits. In 1995, he moved to Amoco"s Worldwide Exploration Group in Houston, where his 1997 paper established the modern field of converted-wave exploration, defining such concepts as fC-wavesf, fregistrationf, fgamma effectivef, fdiodic velocityf, etc. In 2008, Leon retired from BP, and established the consultancy Delta Geophysics (
Leon has served the Society of Exploration Geophysics as Distinguished Lecturer, Vice-President, President (2006-07), and Chairman of the Board of SEAM. He served as SEG/EAGE DISC Instructor in 2002. He holds the SEG"s Fessenden Award, and the Russian Academy of Natural Sciences" Kapitsa Medal. He is an Honorary Member of the Geophysical Society of Houston, and of the EAGE, and is a Foreign Member of the Russian Academy of Natural Sciences.

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