reverse -time datuming
DESCRIPTION
REVERSE -TIME DATUMING. M. Zhou Y. Luo (Saudi Aramco). Geology and Geophysics Department University of Utah. Outline. Objective How to Implement Examples Conclusions. Accurate. RTM. Expensive. +. Approx. Phase-shift Kirchhoff. Efficient. Objective. Offset (km). - PowerPoint PPT PresentationTRANSCRIPT
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REVERSE -TIME DATUMINGREVERSE -TIME DATUMING
M. ZhouM. ZhouY. Luo Y. Luo (Saudi Aramco)(Saudi Aramco)
Geology and Geophysics Department Geology and Geophysics Department
University of UtahUniversity of Utah
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OutlineOutline• ObjectiveObjective• How to ImplementHow to Implement• ExamplesExamples• ConclusionsConclusions
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AccurateAccurateExpensiveExpensiveRTMRTM
ObjectiveObjectiveD
epth
(K
m)
Dep
th (
Km
)
Offset (km)Offset (km)
ComplexComplexRough topographyRough topography
Large velocity variationLarge velocity variation
Less ComplexLess Complex
RTDRTD
Phase-shift Phase-shift KirchhoffKirchhoff EfficientEfficient
Approx.Approx.
++
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OutlineOutline• ObjectiveObjective• How to ImplementHow to Implement• ExamplesExamples• ConclusionsConclusions
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d(s|r)d(s|r)
DistancDistancee
Dep
thD
epth
RRSS
x’x’ x’’x’’
d(s|x’’)=d(s|x’’)= g*(r|x’’)g*(r|x’’) d(s|r)d(s|r)
d(s|x’’)d(s|x’’)
d(x’|x’’)d(x’|x’’)=g*(s|x’) d(s|x”)=g*(s|x’) d(s|x”)
d(x’|x’’)d(x’|x’’)
d(s|x’’)d(s|x’’)
Implement RTDImplement RTD
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d(s|r)d(s|r)
DistancDistancee
Dep
thD
epth
RRSS
x’x’ x’’x’’
Target-oriented RTD Target-oriented RTD (Luo , 2002)(Luo , 2002)
g(s|x’)g(s|x’) g(r|x’’)g(r|x’’)** d(s|r)d(s|r)
= d(x’|x’’)= d(x’|x’’)
== d(x’|x’’)d(x’|x’’)
Implement RTDImplement RTD
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OutlineOutline• ObjectiveObjective• ImplementImplement• ExamplesExamples
• ConclusionsConclusions
2-D Salt Model2-D Salt Model Pluto 1.5 (Smarrt Jv.)Pluto 1.5 (Smarrt Jv.)
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2-D Salt Model2-D Salt ModelD
epth
(Km
)D
epth
(Km
)
00
33
15151515Offset (km)Offset (km) 00 Offset (km)Offset (km)
Velocity ModelVelocity Model
Zero-offset DataZero-offset Data
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After RedatumingAfter RedatumingD
epth
(K
m)
Dep
th (
Km
)
00
33
1515
1515Offset (km)Offset (km)
00 Offset (km)Offset (km)
Velocity ModelVelocity Model
Zero-offset Data Zero-offset Data at datumat datum
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2D Salt Model2D Salt ModelD
epth
(K
m)
Dep
th (
Km
)
00 55
22
33
1010 1515Offset (km)Offset (km)
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Dep
th (
Km
)D
epth
(K
m)
00 55
22
33
1010 1515Offset (km)Offset (km)
KM Image After RedatumingKM Image After Redatuming
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KM Images Before RedatumingKM Images Before RedatumingD
epth
(K
m)
Dep
th (
Km
)
00 55
22
33
1010 1515Offset (km)Offset (km)
KM Image After RedatumingKM Image After Redatuming
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Whole Volume RTMWhole Volume RTMD
epth
(K
m)
Dep
th (
Km
)
00 55
22
33
1010 1515Offset (km)Offset (km)
KM Image After RedatumingKM Image After Redatuming
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CPU Time ComparisonCPU Time Comparison
Whole volume RTM:Whole volume RTM:
RTD + KMRTD + KM
KM before datumingKM before datuming
13.4 (50832 sec)13.4 (50832 sec)
6.88 (26147 sec)6.88 (26147 sec)
1 (3801 sec)1 (3801 sec)
S1400, 2048MB memoryS1400, 2048MB memory
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After RedatumingAfter RedatumingD
epth
(K
m)
Dep
th (
Km
)
00
33
1515
1515Offset (km)Offset (km)
00 Offset (km)Offset (km)
Velocity ModelVelocity Model
Zero-offset Data Zero-offset Data at datumat datum
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KM Image After RedatumingKM Image After RedatumingD
epth
(K
m)
Dep
th (
Km
)
00 55
33
33
1010 1515Offset (km)Offset (km)
KMKM
ModelModel
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KM Before and After RedatumingKM Before and After RedatumingD
epth
(K
m)
Dep
th (
Km
)
00 55
33
33
1010 1515Offset (km)Offset (km)
KMKMBeforeBefore
KMKMAfterAfter
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KM After Redatuming vs. RTMKM After Redatuming vs. RTMD
epth
(K
m)
Dep
th (
Km
)
00 55
33
33
1010 1515Offset (km)Offset (km)
BeforeBefore
KMKMAfterAfter
DatumDatum
Whole Whole volumevolume
RTMRTM
Save Save 40%40% w.r.t whole volume RTM w.r.t whole volume RTM
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KM After RedatumingKM After RedatumingD
epth
(K
m)
Dep
th (
Km
)
00 55
33
33
1010 1515Offset (km)Offset (km)
ShallowShallowDatumDatum
DeepDeepDatumDatum
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OutlineOutline• ObjectiveObjective• ImplementImplement• ExamplesExamples
• ConclusionsConclusions
2-D Salt Model2-D Salt Model Pluto 1.5 (Smarrt Jv.)Pluto 1.5 (Smarrt Jv.)
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SMARRT JV. Pluto 1.5 Vp modelSMARRT JV. Pluto 1.5 Vp model D
epth
(K
m)
Dep
th (
Km
)
99
Distance (km)Distance (km)00 3030
00
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Zero-offset DataZero-offset Data
Tim
e (S
ec)
Tim
e (S
ec)
55
Distance (km)Distance (km)55 2525
11
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Reflectivity Model Below DatumReflectivity Model Below Datum
Dep
th (
Km
)D
epth
(K
m)
77
Distance (km)Distance (km)1010 2020
55
Tim
e (S
ec)
Tim
e (S
ec)
Zero-offset Data After DatumingZero-offset Data After Datuming
11
00
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OutlineOutline• ObjectiveObjective• How to ImplementHow to Implement• ExamplesExamples• ConclusionsConclusions
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ConclusionsConclusions• RTD is faster than RTM RTD is faster than RTM
• RTD helps reveal deeper RTD helps reveal deeper structurestructure
• RTD + KM is cost efficient and RTD + KM is cost efficient and provides good depth imageprovides good depth image
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ConclusionsConclusions
• RTD introduces artifacts due toRTD introduces artifacts due todata boundarydata boundary
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10 km10 km
2000 ms2000 ms
Courtesy of Yi Luo (Saudi Aramco)Courtesy of Yi Luo (Saudi Aramco)
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We thank Utah Tomography and We thank Utah Tomography and Modeling/Migration ConsortiumModeling/Migration Consortium
sponsors for their financial supportsponsors for their financial support
AcknowledgementsAcknowledgements