Synthetic Study of Azimuthal AVO Analysis with Anisotropic Spreading Correction

1
Synthetic Study of Azimuthal AVO Analysis with
Anisotropic Spreading Correction

• Ellen (Xiaoxia) Ilya

2
Acknowlegment

• Andreas Rueger

3
Model Geometry
4
Spreading Moveout Parameters
5
Moveout-based Anisotropic Spreading Correction
(MASC)

• input parameters
• pick the raw amplitude
• remove the source and receiver directivity
• correct for geometrical spreading
• calibrate the corrected amplitude

6
Moveout-based Anisotropic Spreading Correction
(MASC)

• input parameters,
• pick the raw amplitude
• remove the source and receiver directivity
• correct for geometrical spreading
• calibrate the corrected amplitude

7
Parameters for Orthorhombic Media
8
Model 1
9
Synthetics for Model 1
Offset (km)
Offset (km)
Offset (km)
2
1
1
2
0
0
1
2
0
1
Time (s)
2
azimuth 0o
azimuth 90o
azimuth 45o
3
10
Reconstructed Reflection Coefficients
0.1
azimuth 90o
azimuth 45o
0.05
azimuth 0o
0.0
0.3
0
0.15
Horizontal slowness (s/km)
11
Comparison of Spreading
8
azimuth 90o
7
azimuth 45o
6
Spreading (km)
5
azimuth 0o
4
3
0
1
2
Offset (km)
12
Reconstructed RCs using t2 gain
0.1
azimuth 90o
0.05
azimuth 45o
azimuth 0o
0.0
0
0.15
0.3
Horizontal slowness (s/km)
13
Model 2
x3
x2
x1
14
Synthetics for Model 2
Offset (km)
Offset (km)
Offset (km)
0
1
2
1
1
0
2
0
2
1
Time (s)
2
azimuth 0o
azimuth 45o
azimuth 90o
3
15
Reconstructed Reflection Coefficients
0.06
azimuth 90o
azimuth 45o
0.04
0.02
azimuth 0o
0.00
-0.02
0.3
0
0.15
Horizontal slowness (s/km)
16
Reconstructed RCs using t2 gain
0.06
azimuth 90o
azimuth 45o
0.04
0.02
azimuth 0o
0.00
-0.02
0
0.15
0.3
Horizontal slowness (s/km)
17
Model 3
x3
x2
x1
18
Synthetics for Model 3
azimuth 45o
azimuth 90o
azimuth 0o
19
Reconstructed Reflection Coefficients
-0.06
azimuth 0o
-0.10
azimuth 45o
-0.14
azimuth 90o
-0.18
0
0.15
0.3
Horizontal slowness (s/km)
20
Reconstructed RCs using t2 gain
-0.06
azimuth 0o
-0.10
azimuth 45o
-0.14
azimuth 90o
-0.18
0
0.15
0.3
Horizontal slowness (s/km)
21
Influence of Transmission Loss
0.2
Model 3
azimuth 90o
0.1
azimuth 45o
azimuth 0o
0.0
-0.1
0.3
0
0.15
Horizontal slowness (s/km)
22
Conclusions

• RCs accurately reconstructed
• fits into processing sequence
• critical for quantitative AVO
• important for qualitative AVO
• transmission loss negligible

23
Acknowledgment

• Andreas Rueger
• Debashish Sarkar
• Dave
• Ken