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Abstract

Summary

PSDM is increasingly becoming rule rather than exception in near surface seismic imaging when the goal is to get detailed sub-surface images and accurate velocity field. PSDM produces the seismic image of an earth model in depth converting the seismic reflection data into a depth section by means of a velocity field. Although different implementations of velocity model building tools exist, they usually start with an estimation of an initial velocity model using moveouts in the time domain and proceed with an iterative model refinement using residual moveouts in the depth domain and seismic reflection tomography. In addition, if available, a priori velocity/depth information, is also considered to improve the accuracy of the velocity model. In shallow seismic reflection imaging, instead, refraction tomography has been used not only to improve the velocity model built with PSDM but also as the exclusive tool to build the velocity model. In our tests, building a velocity model by means of a priori information unrelated with the recorded data or by means of the exclusive use of refraction tomography, PSDM produces depth images that have an imprint of the velocity models and not a result coming only from seismic reflection data.

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/content/papers/10.3997/2214-4609.201413707
2015-09-06
2024-03-29
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References

  1. Bruno, P.P., Castiello, A. and Improta, L.
    [2010] Ultrashallow seismic imaging of the causative fault of the 1980, M6.9, southern Italy earthquake by pre-stack depth migration of dense wide-aperture data. Geophysical Research Letters, 37, L19302.
    [Google Scholar]
  2. Deidda, G.P. and Balia, R.
    [2001] An ultrashallow SH-wave seismic reflection experiment on a subsurface ground model. Geophysics, 66, 1097–1104.
    [Google Scholar]
  3. Jones, I.F.
    [2012] Tutorial: Incorporating near-surface velocity anomalies in pre-stack depth migration models. First Break, 30, 47–58.
    [Google Scholar]
  4. Pasasa, L., Wenzel, F. and Zhao, P.
    [1998] Prestack Kirchhoff depth migration of shallow seismic data. Geophysics, 63, 1241–1247.
    [Google Scholar]
  5. Sambuelli, L., Deidda, G.P., Albis, G., Giorcelli, E. and TristanoG.
    [2001] Comparison of standard horizontal geophones and newly designed horizontal detectors. Geophysics, 66, 1827–1837.
    [Google Scholar]
  6. Versteeg, R.J.
    [1993] Sensitivity of prestack depth migration to the velocity model. Geophysics, 58, 873–882.
    [Google Scholar]
  7. Woldearegay, A.F., Jaiswal, P., Simms, A.R., Alexander, H., Bernent, L.C. and Carter, B.J.
    [2012] Ultrashallow depth imaging of a channel stratigraphy with first-arrival traveltime inversion and prestack depth migration: A case history from Bull Creek, Oklahoma. Geophysics, 77, B87–B96.
    [Google Scholar]
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