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Velocity Model Estimation Using Time-reversal FocusingNormal access

Authors: E. Landa and A. Lellouch
Event name: 79th EAGE Conference and Exhibition 2017
Session: Velocity Model Estimation - Theory I
Publication date: 12 June 2017
DOI: 10.3997/2214-4609.201700602
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1003.39Kb )
Price: € 20

Summary:
Time reversal (TR) is a fundamental concept, consisting of time-reversing and re-propagating the registered wave-field in order to focus it at its true physical source. We propose a way to estimate the velocity model in a cross-hole survey by focusing the full registered wave-field to its source location after time reversal and back propagation. This approach allows for picking-free velocity analysis as well as the usage of global optimization techniques that are insensitive to the initial velocity model. Using a plane wave approximation of the time-reversed data, we significantly reduce computation time and therefore propose a fully automatic and fast procedure for cross-hole velocity model building. We demonstrate the application of the method and its effectiveness on synthetic and field data examples.


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