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Reverse time migration using phase crosscorrelation
- Source :
- Digital.CSIC. Repositorio Institucional del CSIC, instname
- Publication Year :
- 2018
- Publisher :
- Society of Exploration Geophysicists, 2018.
-
Abstract
- Additional information regarding the continuity and resolution of selected seismic reflectors in reverse time migration (RTM) images can be beneficial for seismic interpretation. We have developed and evaluated new imaging conditions for RTM based on the phase coherence between the forward- and backward-propagated wavefields. These imaging conditions make use of the instantaneous phase and envelope of the analytical signals of the source and receiver wavefields, in addition to their real parts. Once the analytical wavefields are available, these imaging conditions can be calculated simultaneously with conventional conditions at little or no extra cost. The availability of these fields at each image point enables several alternative ways to define imaging conditions. We explore, in addition to pure phase crosscorrelation (PC), two approaches of amplitude-weighted PC. Our numerical experiments, imaging synthetic and field data sets, indicate that these new imaging conditions provide additional images that can highlight some weak reflectors by locally improving the resolution of RTM images. In our examples, this happens particularly in the deep portions of the seismic images. In addition, reflection events produced at discontinuities are enhanced as sharp signals, suggesting that the proposed imaging conditions can help to delineate stratigraphic and structural features that are harder to see in conventional images. These properties of the PC imaging conditions make them an interesting tool to provide additional information that can aid seismic interpretation in complex structural settings. © 2018 Society of Exploration Geophysicists.<br />We thank CNPq for the financial support through the Instituto Nacional de Ciências e Tecnologia em Geofísica do Petróleo (INCT-GP). J. C. Costa, W. E. Medeiros, and J. Schleicher also thank CNPq for the research fellowships and associated grants. M. Schimmel thanks the Science without Borders Program for his PVE grant and Misterios project (CGL2013-48601-C2-1-R).
- Subjects :
- Seismic processing
Phase crosscorrelation
010504 meteorology & atmospheric sciences
Geophysical imaging
Resolution (electron density)
Phase (waves)
Seismic migration
Seismic imaging
010502 geochemistry & geophysics
01 natural sciences
Geophysics
Geochemistry and Petrology
Reverse time migration
Seismic interpretation
Seismology
Geology
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 19422156 and 00168033
- Volume :
- 83
- Database :
- OpenAIRE
- Journal :
- GEOPHYSICS
- Accession number :
- edsair.doi.dedup.....2da3c116f25f1ef3a1d79be5229fdac1
- Full Text :
- https://doi.org/10.1190/geo2017-0791.1