1887

Abstract

Summary

To obtain an image of the earth’s subsurface, time domain methods can be applied as a first step. The implicit common reflection surface (CRS) approach provides a powerful tool for time imaging. We can perform a series of processes, e.g., stacking, time migration and demigration. Demigration describes the process of an inverse migration or a back transformation, respectively. The advantage of this data domain transformations are data enhancement and an intrinsic handling of conflicting dips. Furthermore, the stacking attributes serve as input for a data-driven time migration velocity model building. We suggest a velocity analysis method using the coherence of the migration combined with a threshold, following masking of velocities and subsequent interpolation and smoothing. Diffractions are enhanced in an automated fashion during this procedure. Therefore, no user interaction is required to carry out the migration and the following demigration. Applications to field data show good results for the prestack time migration and a suitably smooth velocity model. The demigration is able to reconstruct major events. The suggested data-driven approach to migration and demigration bears the potential to prestack data enhancement and regularisation without the need for expensive conflicting dip treatment.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201601323
2016-05-30
2024-03-28
Loading full text...

Full text loading...

References

  1. Bobsin, M., Schwarz, B., Vanelle, C. and Gajewski, D.
    [2015] Data-driven time migration using amultiparameter approach. 85th Ann. Internat. Mtg. Soc. Expl. Geophys. Expanded Abstracts.
    [Google Scholar]
  2. Claerbout, J., Green, C. and Green, I.
    [1996] Imaging the Earth’s Interior. Free Software Foundation.
  3. Hubral, P.
    [1983] Computing true amplitude reflections in a laterally inhomogeneous earth. Geophysics, 48, 1051–1062.
    [Google Scholar]
  4. Hubral, P., Schleicher, J. and Tygel, M.
    [1996] A unified approach to 3-D seismic reflection imaging, Part I: Basic concepts. Geophysics, 61(3), 742–758.
    [Google Scholar]
  5. Hübscher, C. and Netzeband, G.L.
    [2007] Evolution of a young salt giant: The example of the Messinian evaporites in the Levantine Basin. Taylor & Francis Group, 175–184. In: The Mechanical Behaviour of Salt - Understanding of THMC Processes in Salt.
  6. Iversen, E., Tygel, M., Ursin, B. and de Hoop, M.
    [2012] Kinematic time migration and demigration of reflections in pre-stack seismic data. Geophysical Journal International, 189, 1635–1666.
    [Google Scholar]
  7. Mann, J., Jäger, R., Müller, T., Höcht, G. and Hubral, P.
    [1999] Common-reflection-surface stack - a real data example. Journal of Applied Geophysics, 42, 301–318.
    [Google Scholar]
  8. Schwarz, B., Vanelle, C., Gajewski, D. and Kashtan, B.
    [2014] Curvatures and inhomogeneities: An improved common-reflection-surface approach. Geophysics, 79(5), S231–S240.
    [Google Scholar]
  9. Yilmaz, O.
    [2001] Seismic Data Analysis. SEG, Tulsa.
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201601323
Loading
/content/papers/10.3997/2214-4609.201601323
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