1887
Volume 49, Issue 2
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

[

The artefacts caused by random fluctuations in the background velocity model will contaminate the final image, which makes the work of interpretation difficult to implement in reverse-time migration. The imaging condition proposed in this paper, which exploits the pseudo-Wigner distribution function, can reduce this noise, and also help improve the continuity of complex layers.

,

For reverse-time migration, high-resolution imaging mainly depends on the accuracy of the velocity model and the imaging condition. In practice, however, the small-scale components of the velocity model cannot be estimated by tomographical methods; therefore, the wavefields are not accurately reconstructed from the background velocity, and the imaging process will generate artefacts. Some of the noise is due to cross-correlation of unrelated seismic events. Interferometric imaging condition suppresses imaging noise very effectively, especially the unknown random disturbance of the small-scale part. The conventional interferometric imaging condition is extended in this study to obtain a new imaging condition based on the pseudo-Wigner distribution function (WDF). Numerical examples show that the modified interferometric imaging condition improves imaging precision.

]
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2018-04-01
2026-01-13

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/content/journals/10.1071/EG16116
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Modified interferometric imaging condition for reverse-time migration
Exploration Geophysics 49, 202 (2018); https://doi.org/10.1071/EG16116
/content/journals/10.1071/EG16116
/content/journals/10.1071/EG16116
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  • Article Type: Research Article
Keyword(s): artefacts; interferometric imaging condition; reverse-time migration; small-scale components

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