1. Synthetic Study of Azimuthal AVO Analysis with Anisotropic Spreading Correction Ellen (Xiaoxia) & Ilya

2. Acknowlegment Andreas Rueger

3. Model Geometry

4. Spreading: Moveout Parameters

5. Moveout-based Anisotropic Spreading Correction (MASC)  input parameters  pick the raw amplitude  remove the source and receiver directivity  correct for geometrical spreading  calibrate the corrected amplitude

6. Moveout-based Anisotropic Spreading Correction (MASC)  input parameters,  pick the raw amplitude  remove the source and receiver directivity  correct for geometrical spreading  calibrate the corrected amplitude

7. Parameters for Orthorhombic Media

8. Model 1 x1x1 x2x2 x3x3

9. Synthetics for Model 1 Time (s) 3 2 1 Offset (km) 01 2 0 1 2 0 1 2 azimuth 0 o azimuth 45 o azimuth 90 o

10. Reconstructed Reflection Coefficients Horizontal slowness (s/km) 00.15 0.3 0.0 0.05 0.1 azimuth 0 o azimuth 90 o azimuth 45 o

11. Comparison of Spreading Offset (km) 012 3 8 7 6 5 4 azimuth 0 o azimuth 90 o azimuth 45 o Spreading (km)

12. Reconstructed RCs using t 2 gain Horizontal slowness (s/km) 0 0.15 0.3 0.0 0.05 0.1 azimuth 0 o azimuth 45 o azimuth 90 o

13. Model 2 x1x1 x2x2 x3x3

14. Synthetics for Model 2 Offset (km) 01 2 0 1 2 0 1 2 Time (s) 3 2 1 azimuth 0 o azimuth 45 o azimuth 90 o

15. Reconstructed Reflection Coefficients 0.06 -0.02 Horizontal slowness (s/km) 00.15 0.3 0.00 0.04 0.02 azimuth 0 o azimuth 45 o azimuth 90 o

16. Reconstructed RCs using t 2 gain 00.15 0.3 0.06 0.04 0.02 0.00 -0.02 Horizontal slowness (s/km) azimuth 0 o azimuth 45 o azimuth 90 o

17. Model 3 x1x1 x2x2 x3x3

18. Synthetics for Model 3 Time (s) 3 2 1 Offset (km) 01 2 01 2 012 azimuth 90 o azimuth 45 o azimuth 0 o

19. Reconstructed Reflection Coefficients Horizontal slowness (s/km) 00.150.3 -0.06 -0.10 -0.14 -0.18 azimuth 0 o azimuth 90 o azimuth 45 o

20. Reconstructed RCs using t 2 gain Horizontal slowness (s/km) 00.150.3 -0.06 -0.10 -0.14 -0.18 azimuth 0 o azimuth 90 o azimuth 45 o

21. Influence of Transmission Loss Horizontal slowness (s/km) 0 0.15 0.3 Model 3 0.0 -0.1 0.1 0.2 azimuth 0 o azimuth 90 o azimuth 45 o

22. Conclusions RCs accurately reconstructed fits into processing sequence critical for quantitative AVO important for qualitative AVO transmission loss negligible

23. Acknowledgment Andreas Rueger Debashish Sarkar Dave Ken