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Three-dimensional depth imaging with generalized screens; a salt body case study

Jerome H. Le Rousseau, Henry Calandra and Maarten V. de Hoop
Three-dimensional depth imaging with generalized screens; a salt body case study
Geophysics (August 2003) 68 (4): 1132-1139

Abstract

We illustrate the performance of the generalized screen propagator on real seismic data for 3D zero-offset and prestack depth imaging. We use TotalFinaElf's L7D data set from the North Sea, a 3D marine seismic survey that contained limited azimuthal coverage. The subsurface shows significant tectonic deformation, including an intrusive salt body in sedimentary sequences. A transformation to common azimuth is applied prior to the 3D prestack depth imaging procedure. We compare the performance of the generalized screen propagator with that of a hybrid phase shift plus interpolation (PSPI)/split-step Fourier method. Three-dimensional prestack results confirm the generalized screen method handles multipathing more accurately. Comparisons are also made with Kirchhoff migration results. The results differ mainly in the fine-scale irregularities of the image and not in the wavefront set of the image. Using synthetic models of similar structure (the SEG/EAGE salt model), we further illustrate the importance of multipathing and multiple scattering. Overall, our results show that our wave-equation approach produces better images than the Kirchhoff approach to prestack depth migration; we attribute this mainly to a more complete handling of wave diffraction in the generalized screen expansion, which becomes important in strongly heterogeneous and irregular velocity models such as the ones containing salt bodies.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 68
Serial Issue: 4
Title: Three-dimensional depth imaging with generalized screens; a salt body case study
Affiliation: Colorado School of Mines, Center for Wave Phenomena, Golden, CO, United States
Pages: 1132-1139
Published: 200308
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 16
Accession Number: 2004-024791
Categories: Structural geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N51°00'00" - N61°10'00", W04°00'00" - E11°00'00"
Secondary Affiliation: TotalFinaElf, FRA, France
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200408
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