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AVO INVERSION OF LONG-OFFSET SYNTHETIC PP DATA BASED ON EFFECTIVE REFLECTION COEFFICIENTS

AVO INVERSION OF LONG-OFFSET SYNTHETIC PP DATA BASED ON EFFECTIVE REFLECTION COEFFICIENTS. Lyubov Skopintseva Milana Ayzenberg, Martin Landrø Tatyana Nefedkina, Arkady Aizenberg. 10 April 2008. AVO- analysis . What is that ?. Conventional AVO analysis:

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AVO INVERSION OF LONG-OFFSET SYNTHETIC PP DATA BASED ON EFFECTIVE REFLECTION COEFFICIENTS

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  1. AVO INVERSION OF LONG-OFFSET SYNTHETIC PP DATA BASED ON EFFECTIVE REFLECTION COEFFICIENTS Lyubov Skopintseva Milana Ayzenberg, Martin Landrø Tatyana Nefedkina, Arkady Aizenberg 10 April 2008

  2. AVO-analysis. What is that? • Conventional AVO analysis: • Range of incidence angles: 0-400 • Weak contrasts at reflector

  3. Plane-wave reflection coefficient Post-critical region Critical angle Pre-critical region

  4. Effective reflection coefficient (ERC) Incident wave Plane-wave decomposition Multiplying by plane-wave reflection coefficient (PWRC) Summation Division by incident wave

  5. ERC versus PWRC • PWRC valid for plane waves • ERC generalize PWRC for point sources - incidence angle - frequency - wavefront curvature - wave velocity

  6. ERC versus PWRC

  7. Model parameters

  8. Z-component from reflectivity modeling

  9. AVO response

  10. Spectrogram

  11. AVO response comparison with ERC and PWRC

  12. Cost functions comparison (pre-critical offsets) Effective reflection coefficient Plane-wave reflection coefficient

  13. Cost functions comparison (all offsets) Effective reflection coefficient Plane-wave reflection coefficient

  14. AVO inversion results ERC solution PWRC solution

  15. Conclusion • ERC give better estimates than PWRC • Rapid variations in reflection amplitude for post-critical offsets improve inversion results • Long-offset data allow accurate estimation of Vp and Vs

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