2. Velocity Analysis Using Surface-Seismic Primaries-Only Data Obtained Without Removing Multiples
E. Dokter, G.A. Meles, A. Curtis, K. Wapenaar
MSCA-ITN-2014-ETN – GA N°

3. Overview extraction of primaries-only data
Convolutional interferometry
Marchenko redatuming
velocity analysis and migration

4. Extracting primaries-only data
convolutional interferometry & Marchenko redatuming

5. Extracting primaries-only data
convolutional interferometry & Marchenko redatuming

6. Extracting primaries-only data
convolutional interferometry & Marchenko redatuming

7. Extracting primaries-only data
convolutional interferometry & Marchenko redatuming

8. Extracting primaries-only data
convolutional interferometry & Marchenko redatuming

9. Extracting primaries-only data
convolutional interferometry & Marchenko redatuming !
Meles et al. (2016)

10. Extracting primaries-only data
convolutional interferometry & Marchenko redatuming !
Meles et al. (2016)

11. Extracting primaries-only data
convolutional interferometry & Marchenko redatuming ?

12. Extracting primaries-only data
convolutional interferometry & Marchenko redatuming

13. Extracting primaries-only data
convolutional interferometry & Marchenko redatuming

14. Extracting primaries-only data
convolutional interferometry & Marchenko redatuming

15. Extracting primaries-only data
convolutional interferometry & Marchenko redatuming
𝐺 𝑃1 𝑥 2 , 𝑥 1 ≈ 𝑆 𝑖ω 𝑐(𝑥)ρ(𝑥) 𝐺 𝐹 − 𝑥, 𝑥 2 𝐺 𝐷 + 𝑥, 𝑥 1 + 𝐺 𝐷 + 𝑥, 𝑥 2 𝐺 𝐹 − 𝑥, 𝑥 1 𝑑 𝑆 1

16. Extracting primaries-only data
convolutional interferometry & Marchenko redatuming
𝐺 𝑃2 𝑥 2 , 𝑥 1 ≈ 𝑆 𝑖ω 𝑐(𝑥)ρ(𝑥) 𝐺 𝐹 − 𝑥, 𝑥 2 𝐺 𝐷 + 𝑥, 𝑥 1 + 𝐺 𝐷 + 𝑥, 𝑥 2 𝐺 𝐹 − 𝑥, 𝑥 1 𝑑 𝑆 2
𝐺 𝑃 𝑥 2 , 𝑥 1 ≈ 𝑘 𝑆 𝑘 2𝑖ω 𝑐(𝑥)ρ(𝑥) 𝐺 𝐹 − 𝑥, 𝑥 2 𝐺 𝐷 + 𝑥, 𝑥 1 + 𝐺 𝐷 + 𝑥, 𝑥 2 𝐺 𝐹 − 𝑥, 𝑥 1 𝑑 𝑆 𝑘

17. Extracting primaries-only data
1000 m/s

18. Velocity analysis and migration
offset
offset t
offset t

19. Velocity analysis and migration
1000 m/s

20. Velocity analysis and migration
1000 m/s

21. Velocity analysis and migration
1000 m/s

22. Velocity analysis and migration
1000 m/s

23. Velocity analysis and migration
1000 m/s

24. Velocity analysis and migration
1000 m/s

25. Velocity analysis and migration
1000 m/s

26. Conclusion Synthetic example for generating primaries-only data
→ works even with wrong velocity model
No artefacts (multiples), but long offset information may be missing
Used data for semblance velocity analysis to build velocity model
Reverse Time Migration of primaries-only data recovers all reflectors well and without artefacts