reverse-time migration for 3d seg/eage salt model yue wang university of utah
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Reverse-Time MigrationReverse-Time MigrationFor 3D SEG/EAGE For 3D SEG/EAGE
Salt ModelSalt Model
Yue WangYue Wang
University of UtahUniversity of Utah
OutlineOutline
• Method & Previous 2D resultsMethod & Previous 2D results
• Result for 3D SEG/EAGE Salt Result for 3D SEG/EAGE Salt ModelModel
• Conclusions & DiscussionsConclusions & Discussions
2-D Salt Model2-D Salt Model
Distance (km)Distance (km)
Dep
th (
km
)D
epth
(k
m)
2.72.7
00
00 4.54.5
** Geophone LineGeophone LineSourceSource
Shot GatherShot GatherPressurePressureVerticalVerticalHorizontalHorizontal
Tim
e (s
) T
ime
(s)
Distance (km)Distance (km)22
00
0.90.9 3.63.6 Distance (km)Distance (km)0.90.9 3.63.6 Distance (km)Distance (km)0.90.9 3.63.6
PSPS
PPPPReceiver-Side Receiver-Side Surface GhostSurface Ghost
Reversed PhaseReversed Phase
Water bottomWater bottom
How to use P & V?How to use P & V?Key Idea:Key Idea:
• Migrate pressure and particle Migrate pressure and particle velocity velocity simultaneouslysimultaneously by using by using wave-equation;wave-equation;
Up-goingUp-goingWaveWave Down-goingDown-going
Down-goingDown-goingWaveWave
Up-goingUp-going
Kirchhoff MigrationKirchhoff Migration
Distance (km)Distance (km)
Dep
th (
km
)D
epth
(k
m)
2.52.5
00
0.450.45 4.054.05
Kirchhoff MigrationKirchhoff Migration
Distance (km)Distance (km)
Dep
th (
km
)D
epth
(k
m)
2.52.5
00
0.450.45 4.054.05
Distance (km)Distance (km)
Dep
th (
km
)D
epth
(k
m)
2.52.5
00
0.450.45 4.054.05
Particle-Velocity RT SchemeParticle-Velocity RT Scheme
Distance (km)Distance (km)
Dep
th (
km
)D
epth
(k
m)
2.52.5
00
0.450.45 4.054.05
P & V RT SchemeP & V RT Scheme
OutlineOutline
• Method & Previous 2D resultsMethod & Previous 2D results
• Result for 3D SEG/EAGE Salt Result for 3D SEG/EAGE Salt ModelModel
• Conclusions & DiscussionsConclusions & Discussions
3-D SEG/EAGE Salt Model3-D SEG/EAGE Salt Model
Distance (km)Distance (km)
Dep
th (
km
)D
epth
(k
m)
22
00
00 4.54.5
Ocean-BottomOcean-BottomGeophone LineGeophone Line
Exploding Exploding Reflector SourceReflector Source
CrosslineCrossline
3-D SEG/EAGE Salt Model3-D SEG/EAGE Salt Model
Distance (km)Distance (km)
Dep
th (
km
)D
epth
(k
m)
22
00
00 4.54.5
Ocean-BottomOcean-BottomGeophone LineGeophone Line
Exploding SourceExploding Source
Direct Arrival FromDirect Arrival FromReflection LayerReflection Layer
Ghost ReflectinsGhost Reflectins
3-D SEG/EAGE Salt Model3-D SEG/EAGE Salt Model
Distance (km)Distance (km)
Dep
th (
km
)D
epth
(k
m)
22
00
00 4.54.5
Ocean-BottomOcean-BottomGeophone LineGeophone Line
Exploding SourceExploding Source
3-D SEG/EAGE Salt Model3-D SEG/EAGE Salt Model
Distance (km)Distance (km)
Dep
th (
km
)D
epth
(k
m)
22
00
00 4.54.5
Ocean-BottomOcean-BottomGeophone LineGeophone Line
Exploding SourceExploding Source
Ghost ReflectinsGhost Reflectins
Particle-Velocity RT SchemeParticle-Velocity RT Scheme
Distance (km)Distance (km)
Dep
th (
km
)D
epth
(k
m)
22
00
00 4.54.5
Particle-Velocity RT SchemeParticle-Velocity RT Scheme
Distance (km)Distance (km)
Dep
th (
km
)D
epth
(k
m)
22
00
00 4.54.5
Distance (km)Distance (km)
Dep
th (
km
)D
epth
(k
m)
22
00
00 4.54.5
P & V RT SchemeP & V RT Scheme
Particle-Velocity RT SchemeParticle-Velocity RT Scheme
Distance (km)Distance (km)
Dep
th (
km
)D
epth
(k
m)
22
00
00 4.54.5
Conclusions & DiscussionsConclusions & Discussions
• Image using both primary and ghost Image using both primary and ghost reflections.reflections.
• FD + kirchhoff hybrid scheme?FD + kirchhoff hybrid scheme?
AcknowledgementAcknowledgement
We are grateful to the 2000 sponsors We are grateful to the 2000 sponsors of the UTAM consortium for the of the UTAM consortium for the financial supportfinancial support
Distance (km)Distance (km)
Dep
th (
km
)D
epth
(k
m)
22
00
00 4.54.5
P & V SchemeP & V Scheme
Distance (km)Distance (km)
Dep
th (
km
)D
epth
(k
m)
22
00
00 4.54.5
P & V RT SchemeP & V RT Scheme
How to use P & V?How to use P & V?2. Reverse-time migration using P & V:2. Reverse-time migration using P & V:
• Migrate pressure and particle Migrate pressure and particle velocity velocity simultaneouslysimultaneously by using by using wave-equation;wave-equation;
• Ghost is used for imaging;Ghost is used for imaging;• Non-flat water bottom;Non-flat water bottom;• Worked on 2D Model.Worked on 2D Model.
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