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Wave Equation Migration Using Isochron Rays
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 70th EAGE Conference and Exhibition incorporating SPE EUROPEC 2008, Jun 2008, cp-40-00479
- ISBN: 978-90-73781-53-5
Abstract
The migration of a single seismic trace produces an image where the amplitudes are distributed along isochron surfaces. This image can be interpreted as a superposition of snapshots taken from a propagating isochron in an equivalent velocity media, i.e. an isochron-field. We present an isochron-field migration method which is comprised of three steps: equivalent velocity computation, data conditioning, and application of a standard zero-offset wave-field extrapolation migration algorithm. We suggest the term equivalent exploding reflector model for the hypothetical model that theoretically supports our imaging approach. The presented methodology extends the use of zero-offset wave-equation imaging algorithms to finite-offset gathers. We successfully applied the approach for depth migrate a common-offset gather. The methodology presents some features that can facilitate the implementation of parallelized migration velocity analysis algorithms.