1887

Abstract

Summary

It is generally understood that imaging within the vicinity of the volcanic structures, such as the seaward dipping reflector (SDR) has been a difficult task. This is mainly due to the highly heterogeneous, systematic layering and stacking of basalts that has led to an effective transverse isotropic anisotropy within the SDR structure. Hence, wide-angle and wide-azimuth reflection seismic survey is one of the best techniques to use as it can record a lot more information compared to conventional reflection seismic surveys (e.g., greater offset and azimuthal measurements for travel-time differences and reflection amplitude variations). This is especially important for the identification of anisotropic features. In this paper, conceptual seismic models of the SDR geometry are created in order to analyse the variation of reflection coefficients with respect to different magnitudes and symmetries of fabric-induced anisotropy. Specifically, we seek to analyse whether the seismic amplitude response and critical reflections at dipping reflector show significant variations with azimuth with respect to the different top SDR horizon geometry. Based on our results, we conclude that azimuthal analysis of seismic amplitudes is influenced by the degree and type of anisotropy as well as by the geometry of the top and bottom horizon of reflector.

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/content/papers/10.3997/2214-4609.201600712
2016-05-31
2020-02-18
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References

  1. Christie, P., I.Gollifer and D.Cowper
    . 2002. Borehole seismic results from the Lopra deepening project. In: Journal of Conference Abstracts, 138–139.
    [Google Scholar]
  2. Guest, W. and J.Kendall
    . 1993. Modelling seismic waveforms in anisotropic inhomogeneous media using ray and Maslov asymptotic theory: applications to exploration seismology. J. Expl. Geophys, 29, 78–92.
    [Google Scholar]
  3. Landrø, M. and I.Tsvankin
    . 2007. Seismic critical-angle reflectometry: A method to characterize azimuthal anisotropy?Geophysics, 72(3), D41–D50.
    [Google Scholar]
  4. Planke, S. and H.Cambray
    . 1998. 38. Seismic properties Of flood basalts from Hole 917a downhole data, Southeast Greenland Volcanic Margin1.
    [Google Scholar]
  5. Planke, S. and O.Eldholm
    . 1994. Seismic response and construction of seaward dipping wedges of flood basalts: Vøring volcanic margin. Journal of Geophysical Research: Solid Earth (1978–2012), 99(B5), 9263–9278.
    [Google Scholar]
  6. Rüger, A.
    1997. P-wave reflection coefficients for transversely isotropic models with vertical and horizontal axis of symmetry. Geophysics, 62(3), 713–722.
    [Google Scholar]
  7. Shuey, R.
    1985. A simplification of the Zoeppritz equations. Geophysics, 50(4), 609–614.
    [Google Scholar]
  8. Thomsen, L.
    1986. Weak elastic anisotropy. Geophysics, 51(10), 1954–1966.
    [Google Scholar]
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