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A strategy for computing seismic attributes on depth-migrated data using time-shift gathers

Mark Roberts
A strategy for computing seismic attributes on depth-migrated data using time-shift gathers
Geophysics (May 2017) 82 (3): O37-O46

Abstract

Assumptions made during postprocessing can be as important as those made during migration. Prestack depth migration (PSDM) is often used due to its ability to handle lateral velocity variations and dipping events. However, most postprocessing flows still use a simple 1D "depth-to-time" vertical stretch, violating the very assumptions that led us to use PSDM. Postprocessing workflows based on time-shift depth image gathers allow for postprocessing flows that make no further approximations other than those made in migration. For cases in which time-shift gathers are not computed during migration, they can be approximated by use of the "exploding-reflector" model or through an orthogonal shift and interpolation method.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 82
Serial Issue: 3
Title: A strategy for computing seismic attributes on depth-migrated data using time-shift gathers
Author(s): Roberts, Mark
Affiliation: Waveseis, Houston, TX, United States
Pages: O37-O46
Published: 201705
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 18
Accession Number: 2017-056419
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201730
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