1887
Volume 31 Number 4
  • E-ISSN: 1365-2478

Abstract

A

In the western coal‐mining area of Ruhrkohle AG, reflection seismic prospecting for the Carboniferous coal measures is severely impaired by structures with halokinetic features. These structures make the interface between Mesozoic and Paleozoic layers, i.e., the top of Zechstein in general, very rugged. Unfortunately the velocity contrast at this interface is very high in that area, the ratio of velocities being 1.5 to 2.0. Therefore, migration and stacking become a problem.

Three types of migration are presented:

  • ()‐time‐migration with vertical time‐to‐depth conversion as a second step.
  • Kirchhoff migration down to a level determined approximately by the highest points of the top of Paleozoics, i.e., 0.35 s, and Kirchhoff‐downward continuation for all times exceeding 0.35 s. Intermediate static corrections for these latter times with subsequent ()‐time‐migration and final vertical time‐to‐depth conversion.
  • Direct depth migration in the ()‐domain using three interval velocities.

In all cases an intermediate picking of the velocity interfaces is necessary. In case 2 this occurs at an earlier stage of the process than in case 1, and in case 3 at a still earlier stage.

The results of the second and third migration procedures are superior to those of the first. Possibilities for misinterpretation of faults are reduced considerably when the second or third migration procedure is applied.

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2006-04-27
2020-04-02
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References

  1. Bading, R. and Krey, T. C.1965, Optimum attenuation of multiples by appropriate CRPfield techniques and migration. Paper presented at the SEG Annual Meeting. Preprints available from Prakla‐Seismos GmbH, Hannover/Germany .
    [Google Scholar]
  2. Berkhout, A. J.1980, Seismic Migration, Imaging of Acoustic Energy by Wave Field Extrapolation. Elsevier, Amsterdam .
    [Google Scholar]
  3. Hubral, P. and KreyT. C.1980, Interval Velocities from Seismic Reflection Time Measurements (ed. K. L.Larner ), SEG Monograph, Tulsa .
    [Google Scholar]
  4. Raubold, H. and Rist, H.1982, Tiefenmigration—ein Anwendungsbeispiel unter Benutzung aufbereiteter Stapelgeschwindigkeiten. Paper presented at the DGG Meeting on 30 March 1982 in Hannover. Preprints available from Prakla‐Seismos GmbH, Hannover .
    [Google Scholar]
  5. Ristow, D.1980, 3D‐downward extrapolation of seismic data in particular by finite difference methods. PhD Thesis, Rijksuniversiteit, Utrecht .
  6. Schneider, W. A.1978, Integral formulation for migration in two and three dimensions. Geophysics43, 49–76.
    [Google Scholar]
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