migration deconvolution for vsp and surface data
DESCRIPTION
Migration Deconvolution for VSP and Surface Data. Jianhua Yu. Feb 3, 2005. Outline. Migration Deconvolution. Motivation. Examples. Summary. Outline. Migration Deconvolution. Examples. Motivation. Summary. Surface Seismic Migration and MD images. 5. WE Mig. Depth (km). MD. 10. - PowerPoint PPT PresentationTRANSCRIPT
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Migration Deconvolution Migration Deconvolution for VSP and Surface Datafor VSP and Surface Data
Jianhua YuJianhua Yu
Feb 3, 2005Feb 3, 2005
![Page 2: Migration Deconvolution for VSP and Surface Data](https://reader035.vdocuments.net/reader035/viewer/2022062500/5681584c550346895dc5a5d8/html5/thumbnails/2.jpg)
OutlineOutlineMotivation
Migration Deconvolution
Examples
Summary
![Page 3: Migration Deconvolution for VSP and Surface Data](https://reader035.vdocuments.net/reader035/viewer/2022062500/5681584c550346895dc5a5d8/html5/thumbnails/3.jpg)
OutlineOutlineMotivation
Migration Deconvolution
Examples
Summary
![Page 4: Migration Deconvolution for VSP and Surface Data](https://reader035.vdocuments.net/reader035/viewer/2022062500/5681584c550346895dc5a5d8/html5/thumbnails/4.jpg)
5
10
Dep
th (
km
)
WE Mig.
MD
Surface Seismic Migration and MD images
![Page 5: Migration Deconvolution for VSP and Surface Data](https://reader035.vdocuments.net/reader035/viewer/2022062500/5681584c550346895dc5a5d8/html5/thumbnails/5.jpg)
3D
VSP Data: VSP Data:
Irregular acquisition geometry
well
2D
![Page 6: Migration Deconvolution for VSP and Surface Data](https://reader035.vdocuments.net/reader035/viewer/2022062500/5681584c550346895dc5a5d8/html5/thumbnails/6.jpg)
Objectives : Objectives :
Improve spatial resolution
Enhance illumination
Suppress migration noise and artifacts
Develop migration deconvolution for VSP data
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OutlineOutlineMotivation
Migration Deconvolution
Examples
Summary
![Page 8: Migration Deconvolution for VSP and Surface Data](https://reader035.vdocuments.net/reader035/viewer/2022062500/5681584c550346895dc5a5d8/html5/thumbnails/8.jpg)
mMigration Modeling
Migration image
RG GT
Reflectivity
Migration:
G GT -1
][ G GT -1
][RG GT m
Migration deconvolution:
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mR G GT -1
][
Migration Green’s Function
sgsoogsgomig rdrdrrGrrGrrGrrGrr
)()()()()( **
MD image
Migration Deconvolution
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)(~
),,~,(~
...,),,,~,(~
),,,~,(~
)(~21 inppippippii zkRzyxzkzyxzkzyxzkzkm
FFT of ),,,,( ippj zyxzyx
MigratedMigrated
datadata
m
True True ReflectivityReflectivity
R
Discrete Migration deconvolution
![Page 11: Migration Deconvolution for VSP and Surface Data](https://reader035.vdocuments.net/reader035/viewer/2022062500/5681584c550346895dc5a5d8/html5/thumbnails/11.jpg)
OutlineOutlineMotivationMigration deconvolution
Examples
Summary
VSP data
Surface seismic data
![Page 12: Migration Deconvolution for VSP and Surface Data](https://reader035.vdocuments.net/reader035/viewer/2022062500/5681584c550346895dc5a5d8/html5/thumbnails/12.jpg)
3 km
3 km
1.75 km
Nsx=Nsy=21, dsx=dsy=150 m
12 g
eoph
one
Ng=12, dgz=50 m
(750 m – 1300m)
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VSP Geometry: source 21 x 21; geophone: 12
Depth=1.75 kmMigration MD
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3 km
3 km
1.75 km
Nsx=Nsy=21, dsx=dsy=150 m
30 g
eoph
one
Ng=30, dgz=50 m
(100 m – 1500m)
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Depth=1.75 km
Migration MD
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OutlineOutlineMotivationMigration deconvolution
Examples
Summary
VSP data from salt model
Surface seismic data
![Page 17: Migration Deconvolution for VSP and Surface Data](https://reader035.vdocuments.net/reader035/viewer/2022062500/5681584c550346895dc5a5d8/html5/thumbnails/17.jpg)
750 m
21 g
eop
hon
es
7 km
16 km
320 shots
2D
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Velocity
X (km)
Dep
th (
km)
Well
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X (km)
Tim
e (s
)
10
0
0 15
CRG 21 (z=7.75 km)
(Courtesy of BP)
X (km)0 15
CRG 1 (z=7.0 km)
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Primary Migration Image
X (km)
Dep
th (
km)
12
5
0 15
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X (km)0 10
MDX (km)
Dep
th (
km
)
10
8
0 10
MIG
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X (km)4 10
MDX (km)
Dep
th (
km
)
10
8
4 10
MIG
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OutlineOutlineMotivationMigration deconvolution
Examples
Summary
vsp data
Surface seismic data
![Page 24: Migration Deconvolution for VSP and Surface Data](https://reader035.vdocuments.net/reader035/viewer/2022062500/5681584c550346895dc5a5d8/html5/thumbnails/24.jpg)
L500
Mig (Unocal) MD
X XT
ime
(s)
0.0
4.5
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L500
Mig (Unocal) MD
X XT
ime
(s)
1.0
4.0
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X10
Mig (Unocal) MD
Y YT
ime
(s)
1.0
5.0
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X10
Mig (Unocal) MD
Y YT
ime
(s)
2.5
4.0
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Inline 171
1 500Xline 1 500Xline
Tim
e (s
)
2.4
4
MIG (Unocal) MD
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Mig MDYcross x=50T
ime
0.5
4.50 41Y (kft) 0 41Y (kft)
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Mig MDYcross x=50T
ime
0.5
2.00 41Y (kft) 0 41Y (kft)
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Mig MDXcross Y=125T
ime
0.5
4.50 12X (kft) 0 12X (kft)
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Mig MDT
ime
2.5
4.5
Xcross Y=125
4 12X (kft) 4 12X (kft)
![Page 33: Migration Deconvolution for VSP and Surface Data](https://reader035.vdocuments.net/reader035/viewer/2022062500/5681584c550346895dc5a5d8/html5/thumbnails/33.jpg)
Xline 181
1 170Inline 1 170Inline
Tim
e (s
)
2.4
4
MDMIG (Unocal)
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Xline 281
1 170Inline 1 170Inline
Tim
e (s
)
2.4
4
MDMIG (Unocal)
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Mig MD
0
Z=3.0s
12.75X(kft) 0 12.75X(kft)
Y (
kft)
41
0
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1 170Inline 1 170Inline
Xli
ne
1
550
MDMIG (Unocal)
3.4 s
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1 170Inline 1 170Inline
Xli
ne
1
550
MDMIG (Unocal)
3.6 s
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OutlineOutlineMotivationMigration deconvolution
Examples
Summary
VSP data from salt model
Surface seismic data
![Page 39: Migration Deconvolution for VSP and Surface Data](https://reader035.vdocuments.net/reader035/viewer/2022062500/5681584c550346895dc5a5d8/html5/thumbnails/39.jpg)
MD improves the resolution of VSP and surface migrated image partly
The cost depends acquisition geometry and filter length used
Summary
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Time MD and poststack MD is more stable.
Summary
To reduce computational cost:
Analytic MD operator
Decimated acquisition geometry
![Page 41: Migration Deconvolution for VSP and Surface Data](https://reader035.vdocuments.net/reader035/viewer/2022062500/5681584c550346895dc5a5d8/html5/thumbnails/41.jpg)
Mig MD
Fre
q
0
120
Spectrum for Meandering Model
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Mig MD
Fre
q
0
120
Spectrum for Unocal Data
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AcknowledgementsAcknowledgements
UTAM Sponsors
BP, Unocal
Brian Hornby, Hans Sugianto
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X10
Mig (Unocal) MD
Y YT
ime
(s)
1.0
5.0