3-d migration deconvolution: real examples jianhua yu university of utah bob estill unocal
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![Page 1: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/1.jpg)
3-D Migration Deconvolution: 3-D Migration Deconvolution: Real ExamplesReal Examples
Jianhua Yu University of UtahJianhua Yu University of UtahBob Estill Unocal Bob Estill Unocal
![Page 2: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/2.jpg)
Motivation
OutlineOutline
3-D Migration Deconvolution (MD)
Examples
Conclusions
![Page 3: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/3.jpg)
Motivation
OutlineOutline
3-D Migration Deconvolution (MD)
Examples
Conclusions
![Page 4: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/4.jpg)
3-D prestack time migration data
Unocal 3-D data from Alaska Unocal 3-D data from Alaska
2002 Winter:
![Page 5: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/5.jpg)
3.0
Mig in Inline (Courtesy of Unocal) MDT
imes
(s)
1.2
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3-D prestack time migration data
3-D prestack depth migration data
2003 Summer: 2003 Summer:
Unocal 3-D data from Alaska Unocal 3-D data from Alaska
2002 Winter:
Does MD work equally well for both time and depth migration?
3-D prestack depth migration data
2003 Summer: 2003 Summer:
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Objectives : Objectives :
Improve spatial resolution
Enhance illumination
Suppress migration noise and artifacts
Apply 3-D migration deconvolution in depth domain
![Page 8: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/8.jpg)
Motivation
OutlineOutline
3-D Migration Deconvolution (MD)
Examples
Conclusions
![Page 9: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/9.jpg)
TT RR = ( = (L LL L ) m ) m
-1-1
Migration Deconvolution TheoryMigration Deconvolution Theory
Migration Green’s function Migration Green’s function (Schuster and Hu, 2000)(Schuster and Hu, 2000)
)|( 0rrmig
MD efficiently eliminates the blurring influence in the migration image
![Page 10: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/10.jpg)
ooomig rdrRrrrm
)()()(
Migration Green’s functionMigration Green’s function(Schuster and Hu, 2000)(Schuster and Hu, 2000)
sgsoogsgomig rdrdrrGrrGrrGrrGrr
)()()()()( **
Migration Deconvolution TheoryMigration Deconvolution Theory
![Page 11: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/11.jpg)
MD Implementation Steps:MD Implementation Steps:
Step 1: Prepare traveltime table
Acquisition geometry information
Velocity
Step 2: Calculate the migration Green’s function at the depth Zi ),,,,( ippj zyxzyx
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)(~.
)(~
)(~
),,~,(~
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n zkR
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zyxzkzyxzkzyxzk
zyxzkzyxzkzyxzk
zyxzkzyxzkzyxzk
zkm
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zkm
For the discrete MD equation:
FFT of ),,,,( ippj zyxzyx
MigratedMigrated
datadata
m
True True ReflectivityReflectivity
R
![Page 13: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/13.jpg)
Step 4: Obtain MD image at the depth Zi by solving following equation
Rm
Step 5: Repeat Steps 2-4 until the maximum depth is finished
Step 6: IFFT of MD image from wavenumber domain to space domain
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Motivation
OutlineOutline
3-D Migration Deconvolution (MD)
Examples
Conclusions
![Page 15: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/15.jpg)
3-D Land Field Data
: Rec
eiver
: Rec
eiver
: sourc
e
: sourc
e
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Mig (Courtesy of Unocal) MDInline Number1 90 1 90
1
300
Cro
sslin
e N
um
ber
Inline Number
(2 kft)
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1.1
Dep
th (
kft
)
8
1 310Crossline Number (Inline =50)
Fault
Fault
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(3.08 kft)
Inline Number1 90 1 901
265
Cro
sslin
e N
um
ber
Inline Number
Mig MD
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(3.6 kft)
Inline Number1 90 1 901
265
Cro
sslin
e N
um
ber
Inline Number
Mig MD
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Inline Number1 901.1
7.0
Dep
th (
kft
)
90 Inline Number1
Mig (courtesy of Unocal) MD
(Crossline=50)
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Inline Number1 901.1
7.0
Dep
th (
kft
)
90 Inline Number1
(Crossline=50)
Mig (courtesy of Unocal) MD
![Page 22: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/22.jpg)
2.5
1.8
Mig in Inline (Courtesy of Unocal) MDT
imes
(s)
![Page 23: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/23.jpg)
(crossline 200)
1 90 1 901.1
8.0
Dep
th (
kft
)Mig (courtesy of Unocal) MD
Inline Number Inline Number
![Page 24: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/24.jpg)
(crossline 200)
1 90 1 901.1
8.0
Dep
th (
kft
)Mig (courtesy of Unocal) MD
Inline Number Inline Number
![Page 25: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/25.jpg)
1 15.51.1
8.0
Dep
th (
kft
)Y (kft) (X=11.2 kft)
Mig
MD
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Motivation
OutlineOutline
Migration Deconvolution (MD)
Examples
Conclusions
Implementation of MD
![Page 27: 3-D Migration Deconvolution: Real Examples Jianhua Yu University of Utah Bob Estill Unocal](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649d775503460f94a59387/html5/thumbnails/27.jpg)
ConclusionsConclusionsImprove resolution and suppress migration artifacts
MD cost is related to acquisition geometry
Little improvement in the deeper part of migration image
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Thanks ToThanks To• Aramco, Unocal, and Chevron-Texaco Aramco, Unocal, and Chevron-Texaco
for providing the field datafor providing the field data
• 2003 UTAM sponsors2003 UTAM sponsors
• Alan Leeds (ChevronTexaco), and Alan Leeds (ChevronTexaco), and George Yao (Unocal)George Yao (Unocal)
• CHPCCHPC