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Synthetic Study of Azimuthal AVO Analysis with Anisotropic
Spreading Correction
Ellen (Xiaoxia) & Ilya
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Acknowlegment
• Andreas Rueger
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Model Geometry
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Spreading: Moveout Parameters
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Moveout-based Anisotropic Spreading Correction (MASC)
input parameterspick the raw amplituderemove the source and receiver directivitycorrect for geometrical spreading calibrate the corrected amplitude
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Moveout-based Anisotropic Spreading Correction (MASC)
input parameters, pick the raw amplituderemove the source and receiver directivitycorrect for geometrical spreading calibrate the corrected amplitude
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Parameters for Orthorhombic Media
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Model 1
x1
x2
x3
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Synthetics for Model 1T
ime
(s)
3
2
1
Offset (km) Offset (km) Offset (km)0 1 2 0 1 2 0 1 2
azimuth 0o azimuth 45o azimuth 90o
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Reconstructed Reflection Coefficients
Horizontal slowness (s/km)0 0.15 0.3
0.0
0.05
0.1
azimuth 0o
azimuth 90o
azimuth 45o
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Comparison of Spreading
Offset (km)0 1 2 3
8
7
6
5
4azimuth 0o
azimuth 90o
azimuth 45o
Sp
read
ing
(km
)
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Reconstructed RCs using t2 gain
Horizontal slowness (s/km)0 0.15 0.3
0.0
0.05
0.1
azimuth 0o
azimuth 45o
azimuth 90o
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Model 2
x1
x2
x3
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Synthetics for Model 2Offset (km) Offset (km) Offset (km)
0 1 2 0 1 2 0 1 2
Tim
e (s
)
3
2
1
azimuth 0o azimuth 45o azimuth 90o
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Reconstructed Reflection Coefficients
0.06
-0.02
Horizontal slowness (s/km)0 0.15 0.3
0.00
0.04
0.02azimuth 0o
azimuth 45o
azimuth 90o
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Reconstructed RCs using t2 gain
0 0.15 0.3
0.06
0.04
0.02
0.00
-0.02
Horizontal slowness (s/km)
azimuth 0o
azimuth 45o
azimuth 90o
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Model 3
x1
x2
x3
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Synthetics for Model 3T
ime
(s)
3
2
1
Offset (km) Offset (km) Offset (km)0 1 2 0 1 2 0 1 2
azimuth 90oazimuth 45oazimuth 0o
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Reconstructed Reflection Coefficients
Horizontal slowness (s/km)0 0.15 0.3
-0.06
-0.10
-0.14
-0.18
azimuth 0o
azimuth 90o
azimuth 45o
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Reconstructed RCs using t2 gain
Horizontal slowness (s/km)0 0.15 0.3
-0.06
-0.10
-0.14
-0.18
azimuth 0o
azimuth 90o
azimuth 45o
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Influence of Transmission Loss
Horizontal slowness (s/km)0 0.15 0.3
Model 3
0.0
-0.1
0.1
0.2
azimuth 0o
azimuth 90o
azimuth 45o
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Conclusions
• RCs accurately reconstructed
• fits into processing sequence
• critical for quantitative AVO
• important for qualitative AVO
• transmission loss negligible
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Acknowledgment
• Andreas Rueger
• Debashish Sarkar
• Dave
• Ken