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pure and applied geophysics

, Volume 159, Issue 6, pp 1305–1320 | Cite as

Decomposition of Structural Amplitude Effect and AVO Attributes: Application to a Gas-water Contact

  • Y. Wang
  • M. H. Worthington
  • R. G. Pratt

Abstract

 — The structural amplitude effect, associated with focusing and defocusing due to the reflector curvature, importantly contributes to reflection seismic amplitudes. This paper develops a conciliatory approach for estimating the structural amplitude effect and the attributes of amplitude variation versus offset (AVO). The AVO attributes are extracted from raw amplitudes, in which the structural effect is taken into account explicitly based on a structural model reconstructed from travel-time inversion. One of the goals is to conduct the AVO analysis not just locally (per CDP) but also horizontally to see the global variation along the reflection. The lateral variations of AVO attributes are decomposed by the Chebyshev expansion. The method is demonstrated with an example of weak shallow gas-water contact appearing on a 2-D seismic profile of a site survey in the North Sea.

Key words: AVO attributes, amplitude inversion, Chebyshev decomposition, gas-water contact, seismic inversion. 

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Copyright information

© Birkhäuser Verlag Basel, 2002

Authors and Affiliations

  • Y. Wang
    • 1
  • M. H. Worthington
    • 2
  • R. G. Pratt
    • 3
  1. 1.Robertson Research International Ltd., Horizon House, Azalea Drive, Swanley, Kent BR8 8JR, England. E-mail: yanghua@geo.robresint.co.ukGB
  2. 2.Department of Earth Sciences and Engineering, Imperial College of Science, Technology and Medicine, London SW7 2BP, England.GB
  3. 3.Department of Geological Sciences, Queen's University, Kingston, Ontario, Canada K7L 3N6.CA

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