Post on 14-Jan-2016
Migration Deconvolution Migration Deconvolution of 3-D Seismic Dataof 3-D Seismic Data
Jianxing HuJianxing Hu
(University of Utah) (University of Utah)
Paul ValasekPaul Valasek
(Phillips Petroleum Company)(Phillips Petroleum Company)
OutlineOutline• ProblemProblem
• SolutionSolution
• Numerical testsNumerical tests
• ConclusionsConclusions
ProblemsProblems• Migration noiseMigration noise
• Recording footprintRecording footprint 15km15km10km10km5km5km0km0km
0km0km
4km4km
• Poor ResolutionPoor Resolution
• Amplitude DistortionAmplitude Distortion
Kirchhoff Migration ImageKirchhoff Migration Image
Modeling and MigrationModeling and Migration
oosoogsg rdSrRrrGrrGrrd
)()(),(),(),(
drdrdrrdrrGrrGSrm sgsgsg
),(),(),()()( ***
Seismic dataSeismic data ReflectivityReflectivityGreen’s FunctionGreen’s Function
Model SpaceModel Space
Migrated ImageMigrated Image
Data SpaceData Space
Seismic DataSeismic Data
Forward Modeling:Forward Modeling:
Migration:Migration:
WaveletWavelet
ooomig rdrRrrrm
)()()( Model SpaceModel Space
),(),()()()( *** sgomig rrGrrGSSrrWhere:Where:
)( omig rr
Denote Denote as the migration Green’s Functionas the migration Green’s Function
drdrdrrGrrG sgsoog
),(),(
Relation of Migrated Image and Relation of Migrated Image and Reflectivity DistributionReflectivity Distribution
Data SpaceData Space
Reflectivity Modulated Reflectivity Modulated by Migration Green’s Functionby Migration Green’s Function
ooomig rdrRrrrm
)()()(
)(rm
)( omig rr
)( orR
Model SpaceModel Space
OutlineOutline• ProblemProblem
• SolutionSolution
• Numerical testsNumerical tests
• ConclusionsConclusions
SolutionSolution Get rid of the influence of migration Get rid of the influence of migration
green’s function from the migrated green’s function from the migrated imageimage
Method:Method:
Migration DeconvolutionMigration Deconvolution
Migration DeconvolutionMigration Deconvolution
),,,,( oppoomig zyxzyyxx
oooooo dzdydxzyxR ),,(Model Space
ooomig rdrRrrrm
)()()(Model SpaceModel Space
Migration Green’s function lateral shift invariantMigration Green’s function lateral shift invariant
• Assumption:
),( pp yx --- --- reference position of migration Green’s functionreference position of migration Green’s function
OutlineOutline• ProblemProblem
• SolutionSolution
• Numerical testsNumerical tests
• ConclusionsConclusions
Numerical TestsNumerical Tests• 2-D SEG/EAGE overthrust model2-D SEG/EAGE overthrust model
• 3-D poststack Kirchhoff migration 3-D poststack Kirchhoff migration
of French model data set of French model data set
• 3-D poststack reverse time migration 3-D poststack reverse time migration
of a gulf of Mexico data setof a gulf of Mexico data set
• 3-D prestack Kirchhoff migration of 3-D prestack Kirchhoff migration of
a North Sea data seta North Sea data set
Velocity ModelVelocity Model 0km0km 15km15km10km10km5km5km
00
15015000
45004500
30003000Dep
th (
m)
Dep
th (
m)
60006000
25025000
Velocity (m
/sec)V
elocity (m/sec)
Comparison of KM and MDComparison of KM and MD
15 km15 km
0 km0 km 15 km15 km
Poststack Migration ImagePoststack Migration Image
Deconvolved Migration ImageDeconvolved Migration Image
0 km0 km
0 km0 km
4 km4 km
0 km0 km
4 km4 km
15 km15 km0 km0 km0 km0 km
4 km4 km
0 km0 km 15 km15 km
Poststack Migration Image of Half Sampled DataPoststack Migration Image of Half Sampled Data
Deconvolved Migration ImageDeconvolved Migration Image
0 km0 km
4 km4 km
Comparison of KM and MDComparison of KM and MD
Comparison of KM and MDComparison of KM and MD
Prestack Migration ImagePrestack Migration Image
Deconvolved Migration ImageDeconvolved Migration Image
0 km0 km 20 km20 km0 km0 km
4 km4 km
20 km20 km 0 km0 km0 km0 km
4 km4 km
Numerical TestsNumerical Tests• 2-D SEG/EAGE overthrust model2-D SEG/EAGE overthrust model
• 3-D poststack Kirchhoff migration 3-D poststack Kirchhoff migration
of French model data set of French model data set
• 3-D poststack reverse time migration 3-D poststack reverse time migration
of a gulf of Mexico data setof a gulf of Mexico data set
• 3-D prestack Kirchhoff migration of 3-D prestack Kirchhoff migration of
a North Sea data seta North Sea data set
French ModelFrench Model
10,000 ft/sec10,000 ft/sec
000
11
44
55
13,000 ft/sec13,000 ft/sec
19,000 ft/sec19,000 ft/sec
10,000 ft/sec
19,000 ft/sec
Dep
th (
km
)D
epth
(k
m)
84X (km)
22
Tested AreaTested Area
Comparison of KM and MD ResultsComparison of KM and MD Results
Y (km)Y (km)
KM KM
33 55 33 55
Dep
th (
km
)D
epth
(k
m)
44
22
44
22
MD MD
D
epth
(k
m)
Dep
th (
km
)
44
22
44
22
X (km)X (km)
11 33 11 33
Crossline Crossline
SectionSection
Inline Inline
SectionSection
Comparison of KM and MD ResultsComparison of KM and MD Results
2.3
3.3
1.3
0.3
SharperSharper
X (km)
SharperSharper
0.353 4
X (km)
2.3
3.3
1.3
Y (
km
)53 4
KM KM MD MD
10,000 ft/sec
13,000 ft/sec
19,000 ft/sec
Test AreaTest Area
X (km) 00 880
5
Dep
th (
km
)
1
2570 m
Numerical TestsNumerical Tests• 2-D SEG/EAGE overthrust model2-D SEG/EAGE overthrust model
• 3-D poststack Kirchhoff migration 3-D poststack Kirchhoff migration
of French model data set of French model data set
• 3-D poststack reverse time migration 3-D poststack reverse time migration
of a gulf of Mexico data setof a gulf of Mexico data set
• 3-D prestack Kirchhoff migration of 3-D prestack Kirchhoff migration of
a North Sea data seta North Sea data set
Poststack RTM Image Poststack RTM Image
of a Gulf of Mexico Data Setof a Gulf of Mexico Data Set 00 33 66 99 1212
X(km)X(km)
11
22
33
44
D
epth
(km
)D
epth
(km
)
Velocity ModelVelocity Model120
0
1
2
3
4
5
6
Dep
th (
km
)
X (km)6
1.6km/s
4.45km/s
3km/s
Comparison of RTM and MD ImagesComparison of RTM and MD Images 66
X(km)X(km)
55 11
22
33
D
epth
(k
m)
Dep
t h (
km
)
11 66
X(km)X(km)
55
22
33
D
epth
(k
m)
Dep
t h (
km
)
RTMRTM MDMD
Comparison of RTM and MD ImagesComparison of RTM and MD Images
33
D
epth
(k
m)
Dep
th (
km
)
7.47.4
Y(km)Y(km)
7.07.0 11
22 22
33
Dep
th (
km
)D
epth
(k
m)
7.47.4
Y(km)Y(km)
7.07.0 11
RTMRTM MDMD
Comparison of Depth SlicesComparison of Depth Slices 7.07.0
7.57.5
Y
(k
m)
Y (
km
)
X (km)X (km)5.05.0 6.06.0
7.07.0
7.57.5
Y
(k
m)
Y (
km
)
X (km)X (km)5.05.0 6.06.0
RTM ImageRTM Image
RTM ImageRTM Image
MD ImageMD Image
MD ImageMD Image
7.07.0
7.57.5
Y
(k
m)
Y (
km
)
X (km)X (km)5.05.0 6.06.0
7.07.0
7.57.5
Y
(k
m)
Y (
km
)
X (km)X (km)5.05.0 6.06.0
Comparison of Depth SlicesComparison of Depth Slices
RTM ImageRTM Image
RTM ImageRTM Image
MD ImageMD Image
MD ImageMD Image
7.07.0
7.57.5
Y
(k
m)
Y (
km
)
X (km)X (km)5.05.0 6.06.0
7.07.0
7.57.5
Y
(k
m)
Y (
km
)
X (km)X (km)5.05.0 6.06.0
7.07.0
7.57.5
Y
(k
m)
Y (
km
)
X (km)X (km)5.05.0 6.06.0
7.07.0
7.57.5
Y
(k
m)
Y (
km
)
X (km)X (km)5.05.0 6.06.0
Numerical TestsNumerical Tests• 2-D SEG/EAGE overthrust model2-D SEG/EAGE overthrust model
• 3-D poststack Kirchhoff migration 3-D poststack Kirchhoff migration
of French model data set of French model data set
• 3-D poststack reverse time migration 3-D poststack reverse time migration
of a gulf of Mexico data setof a gulf of Mexico data set
• 3-D prestack Kirchhoff migration of 3-D prestack Kirchhoff migration of
a North Sea data seta North Sea data set
Comparison of PSKM and MD ImagesComparison of PSKM and MD Images X (km)X (km) 44 66 88 1010
11
44
D
e pth
(km
)D
epth
(km
)
X (km)X (km) 44 66 88 1010
11
44
D
e pth
(km
)D
epth
(km
)
Prestack Kirchhoff Prestack Kirchhoff Migration Image of Migration Image of
a North Sea Data Seta North Sea Data Set
MD Image
KMKM
Y(km)Y(km)
88 66 11
44
D
epth
(k
m)
Dep
th (
km
)
Y (km)Y (km)
D
epth
(k
m)
Dep
th (
km
)
66 11
44
88MDMD
Comparison of PSKM and MD ImagesComparison of PSKM and MD Images
Comparison of Depth SlicesComparison of Depth Slices 66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
Kirchhoff ImageKirchhoff Image MD ImageMD Image
66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
Comparison of Depth SlicesComparison of Depth Slices 66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
Kirchhoff ImageKirchhoff Image MD ImageMD Image
Comparison of Decon and MD ImagesComparison of Decon and MD Images
44 66 88 1010 11
44
D
e pth
(km
)D
epth
(km
)
44 66 88 1010 11
44
D
e pth
(km
)D
epth
(km
)
X (km)X (km)
X (km)X (km)
MD ImageMD Image
AGC + Harmonize + FXY decon image of the raw migration data
Comparison of Decon and MD ImagesComparison of Decon and MD Images
88
Y(km)Y(km)
66
11
44
D
epth
(k
m)
Dep
th (
km
)
Y (km)Y (km)
66 11
44
D
epth
(k
m)
Dep
th (
km
)
88MDMDAGC + Harmonize + FXY decon
Comparison of Depth SlicesComparison of Depth Slices 66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
Harmon + FXY Decon ImageHarmon + FXY Decon Image MD ImageMD Image
66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
Comparison of Depth SlicesComparison of Depth Slices
66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
66
88
Y
(k
m)
Y (
km
)
X (km)X (km)44 88 66 1010
Harmon + FXY Decon ImageHarmon + FXY Decon Image MD ImageMD Image
Results ComparisonResults Comparison
ModelModel
Deconvolved Deconvolved Migration ImageMigration Image
ConventionalConventional
DeconvolutionDeconvolution
MigrationMigrationMDMD
DeconDecon
00
11 11
11
Kirchhoff Migration ImageKirchhoff Migration Image MD ImageMD Image
00 X(km)X(km)
Y
(km
)Y
(km
) 00 00
X(km)X(km)
Y
(km
)Y
(km
)
11
11
MigrationMigration
ImageImage
OutlineOutline• MotivationMotivation
• SolutionSolution
• Numerical testsNumerical tests
• ConclusionsConclusions
ConclusionsConclusions• Works on 2D and 3D migrated Works on 2D and 3D migrated
data, improves resolution, data, improves resolution, mitigates migration artifactsmitigates migration artifacts
• Suitable for Kirchhoff and RTM Suitable for Kirchhoff and RTM migration imagesmigration images
• Post-migration processingPost-migration processing
AcknowledgementAcknowledgement• Thank Phillips petroleum company and other Thank Phillips petroleum company and other
UTAM sponsorsUTAM sponsors
• Thank Phillips petroleum company, Veritas Thank Phillips petroleum company, Veritas marine surveys, Agip (UK) ltd., BG EP ltd., marine surveys, Agip (UK) ltd., BG EP ltd., Centrica plc., Conoco UK ltd., Fina exploration Centrica plc., Conoco UK ltd., Fina exploration ltd., and Phillips (UK) ltd., for granting ltd., and Phillips (UK) ltd., for granting permission to present the application of MD to permission to present the application of MD to gulf of Mexico and North Sea data setgulf of Mexico and North Sea data set