1. Reverse-Time Migration For 3D SEG/EAGE Salt Model
Yue Wang
University of Utah

2. Outline Method & Previous 2D results Result for 3D SEG/EAGE Salt Model
Conclusions & Discussions

3. 2-D Salt Model
Source *
Geophone Line
Depth (km)
2.7
4.5
Distance (km)

4. Shot Gather Reversed Phase Horizontal Vertical Pressure PS PP
Reversed Phase PS PP
Receiver-Side
Surface Ghost
Time (s) 2
0.9
Distance (km)
3.6
0.9
Distance (km)
3.6
0.9
Distance (km)
3.6

5. How to use P & V? Key Idea: Migrate pressure and particle
velocity simultaneously by using
wave-equation;
Water bottom
Down-going
Wave
Up-going
Up-going
Wave
Down-going

6. Kirchhoff Migration
Depth (km)
2.5
0.45
4.05
Distance (km)

7. Kirchhoff Migration
Depth (km)
2.5
0.45
4.05
Distance (km)

8. Particle-Velocity RT Scheme
Depth (km)
2.5
0.45
4.05
Distance (km)

9. P & V RT Scheme
Depth (km)
2.5
0.45
4.05
Distance (km)

10. Outline Method & Previous 2D results Result for 3D SEG/EAGE Salt Model
Conclusions & Discussions

11. 3-D SEG/EAGE Salt Model Crossline Ocean-Bottom Geophone Line
Ocean-Bottom
Geophone Line
Depth (km)
Exploding Reflector Source 2
4.5
Distance (km)

12. 3-D SEG/EAGE Salt Model Direct Arrival From Ghost Reflectins
Ghost Reflectins
Direct Arrival From
Reflection Layer
Ocean-Bottom
Geophone Line
Depth (km)
Exploding Source 2
4.5
Distance (km)

13. 3-D SEG/EAGE Salt Model Depth (km) Ocean-Bottom Geophone Line 2
Ocean-Bottom
Geophone Line
Depth (km)
Exploding Source 2
4.5
Distance (km)

14. 3-D SEG/EAGE Salt Model Ghost Reflectins Depth (km) Ocean-Bottom
Ghost Reflectins
Ocean-Bottom
Geophone Line
Depth (km)
Exploding Source 2
4.5
Distance (km)

15. Particle-Velocity RT Scheme
Depth (km) 2
4.5
Distance (km)

16. Particle-Velocity RT Scheme
Depth (km) 2
4.5
Distance (km)

17. P & V RT Scheme
Depth (km) 2
4.5
Distance (km)

18. Particle-Velocity RT Scheme
Depth (km) 2
4.5
Distance (km)

19. Conclusions & Discussions
Image using both primary and ghost reflections.
FD + kirchhoff hybrid scheme?

20. Acknowledgement
We are grateful to the 2000 sponsors of the UTAM consortium for the financial support

21. P & V Scheme
Depth (km) 2
4.5
Distance (km)

22. P & V RT Scheme
Depth (km) 2
4.5
Distance (km)

23. How to use P & V? 2. Reverse-time migration using P & V:
Migrate pressure and particle
velocity simultaneously by using
wave-equation;
Ghost is used for imaging;
Non-flat water bottom;
Worked on 2D Model.