Reverse-Time Migration For 3D SEG/EAGE Salt Model

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Presentation transcript:

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

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

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

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

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

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

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

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

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

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

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)

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)

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)

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)

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

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

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

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

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

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

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

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

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.