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Volume 63, Issue 5
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

Interferometric redatuming is a data‐driven method to transform seismic responses with sources at one level and receivers at a deeper level into virtual reflection data with both sources and receivers at the deeper level. Although this method has traditionally been applied by cross‐correlation, accurate redatuming through a heterogeneous overburden requires solving a multidimensional deconvolution problem. Input data can be obtained either by direct observation (for instance in a horizontal borehole), by modelling or by a novel iterative scheme that is currently being developed. The output of interferometric redatuming can be used for imaging below the redatuming level, resulting in a so‐called interferometric image. Internal multiples from above the redatuming level are eliminated during this process. In the past, we introduced point‐spread functions for interferometric redatuming by cross‐correlation. These point‐spread functions quantify distortions in the redatumed data, caused by internal multiple reflections in the overburden. In this paper, we define point‐spread functions for interferometric imaging to quantify these distortions in the image domain. These point‐spread functions are similar to conventional resolution functions for seismic migration but they contain additional information on the internal multiples in the overburden and they are partly data‐driven. We show how these point‐spread functions can be visualized to diagnose image defocusing and artefacts. Finally, we illustrate how point‐spread functions can also be defined for interferometric imaging with passive noise sources in the subsurface or with simultaneous‐source acquisition at the surface.

Copyright © 2015 European Association of Geoscientists & Engineers © 2015 European Association of Geoscientists & Engineers
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2015-01-12
2024-04-18

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Point‐spread functions for interferometric imaging
Geophysical Prospecting 63, 1033 (2015); https://doi.org/10.1111/1365-2478.12221
/content/journals/10.1111/1365-2478.12221
/content/journals/10.1111/1365-2478.12221
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  • Article Type: Research Article
Keyword(s): Seismic imaging; Seismic interferometry; Virtual source

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