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Type: Artigo de evento
Title: Time-to-depth Mapping And Imaging Of Time-migrated Seismic Data With Inherent Velocity Estimation
Author: Iversen E.
Tygel M.
Abstract: We introduce a procedure for mapping and imaging, respectively, selected events and complete time-migrated data to the depth domain. A basic assumption is the existence of an appropriate field of time-migration velocities. We utilize the image-ray concept for transformation of events or seismograms from the time-migrated domain to the depth domain. The calculation of image rays relies on the knowledge of ray velocities while the available input in this context is given in the form of a time-migration velocity field. The required ray velocities are obtained from the given migration velocity field by means of the classical Dix algorithm and elements of the ray propagator matrix, i.e., paraxial ray-tracing matrices corresponding to a plane wavefront and a point source in the starting point of the image ray. The numerical integration is formulated as an independent process for each image ray and makes use of ordinary differential equations for the position/slowness vectors and the ray propagator matrix expressed in ray-centered coordinates. Integration of the ray differential equations provides a field of image-ray points and corresponding ray velocities belonging to the depth domain.
Editor: Society of Petroleum Engineers
Rights: fechado
Identifier DOI: 
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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