1887

Abstract

Summary

The geophysical investigation of ancient harbour sites often includes the shallow water area close to the shore. In this environment, hydroacoustic methods are the methods of choice as they provide high resolution in the decimetre range with corresponding penetration depths of several meters. However, in shallow water areas multiple reflections are known to interfere with primary signals reflected by structures of interest. To overcome the problem of water layer multiples, we implemented and tested two model-driven approaches to remove water bottom multiple reflections, which are based on the forward modelling of seismic wave field including multiples. In the first approach, water column multiples are simply modeled and subtracted from the field data, the second approach takes advantage of reverse time migration and a deconvolution imaging condition. The methods are applied to synthetic and real multi-offset data in very shallow water. Both tested methods are able to reduce the signal amplitude of the water bottom multiple by up to ~85 %, if the reflection coefficient at the seafloor is determined with errors of less than 20 %.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201902460
2019-09-08
2024-03-29
Loading full text...

Full text loading...

References

  1. Berkhout, A. J., and Verschuur, D. J.
    [1994] Multiple technology: Part 2, migration of multiple reflections. SEG Technical Program Expanded Abstracts 1994, 1497–1500.
    [Google Scholar]
  2. Claerbout, J. F.
    [1971] Toward a unified theory of reflector mapping. Geophysics, 36(3), 467–481.
    [Google Scholar]
  3. Poole, T. L., Curtis, A., Robertsson, J. O., and Van Manen, D. J.
    [2010] Deconvolution imaging conditions and cross-talk suppression. Geophysics, 75(6), W1–W12.
    [Google Scholar]
  4. RabbelW., WilkenD., WunderlichT., BödeckerS., BrücknerH., ByockJ., von Carnap-BornheimC., KalmringS., KarleM., KenneckeH., MessalS., SchmidtsT., SeeligerM., SegschneiderM., and ZoriD.
    [2015] Geophysikalische Prospektion von Hafensituationen - Möglichkeiten, Anwendungen und Forschungsbedarf. In: T.Schmidts and M.Vucetic (Eds) Häfen im 1. Millennium A.D. - Bauliche Konzepte, herrschaftliche und religiöse Einflüsse. Romano-Germanic Central Museum Press (RGZM), Mainz.
    [Google Scholar]
  5. Wapenaar, K., van der Neut, J. R., and Slob, E. C.
    [2017] Why multiples do not contribute to deconvolution imaging. 79th EAGE Conference and Exhibition.
    [Google Scholar]
  6. Weglein, A. B.
    [1999] Multiple attenuation: an overview of recent advances and the road ahead (1999). The Leading Edge, 18(1), 40–44.
    [Google Scholar]
  7. Wilken, D., Wunderlich, T., Hollmann, H., Schwardt, M., Rabbel, W., Mohr, C., Schulte-Kortnack, D., Nakoinz, O. Enzmann, J., Jürgens, F., and Wilkes, F.
    [2019] Imaging a medieval shipwreck with the new PingPong 3D marine reflection seismic system. Archaeological Prospection. Accepted. DOI:10.1002/arp.1735
    https://doi.org/10.1002/arp.1735 [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201902460
Loading
/content/papers/10.3997/2214-4609.201902460
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error