avo responses as modelled with a finite- difference program peter manning and gary margrave...
TRANSCRIPT
![Page 1: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/1.jpg)
AVO responses as modelled with a finite-difference program
Peter Manning and Gary Margrave
• Introduction: classic AVO cases
• Surface seismic records
• F-D / Zoeppritz amplitude comparisons
• Wavefront / interface movies
• Acknowledgements
• Conclusions
![Page 2: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/2.jpg)
Classic AVO parameters table
Class AVO 1 AVO 2 AVO 3 AVO 4
1a 2000 2000 2000 2000
b1 879.9 879.9 879.9 1000
r1 2.4 2.4 2.4 2.4
a2 2933 2400 1964 1599
b2 1882 1540 1260 654.3
r2 2 2 2 2.456
![Page 3: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/3.jpg)
Vertical displacement seismic record
Arrow indicates reflected pressure wave
![Page 4: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/4.jpg)
Horizontal displacement seismic record
Arrow indicates converted shear wave
![Page 5: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/5.jpg)
Model amplitudes along reflected event
Blue – peak, red – trough, black - Zoeppritz
![Page 6: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/6.jpg)
Model amplitudes along converted reflection
Blue/red – peak/trough, black - Zoeppritz
![Page 7: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/7.jpg)
AVO type 1 movie
![Page 8: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/8.jpg)
Quintuple point at 1000 m.
AVO type 1 movie
![Page 9: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/9.jpg)
AVO type 2 movie
![Page 10: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/10.jpg)
AVO type 2 movie
Quintuple point at 1000 m.
![Page 11: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/11.jpg)
AVO type 3 movie
![Page 12: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/12.jpg)
AVO type 3 movie
Quintuple point at 1000 m.
![Page 13: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/13.jpg)
AVO type 4 movie
![Page 14: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/14.jpg)
AVO type 4 movie
Quintuple point at 1000 m.
![Page 15: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/15.jpg)
• The Zoeppritz equations and finite-difference models have many common features.
• Finite-difference models might prove useful for some quantitative predictions.
Conclusions
• Finite-difference models might show realistic effects beyond the critical angles.
![Page 16: AVO responses as modelled with a finite- difference program Peter Manning and Gary Margrave Introduction: classic AVO cases Surface seismic records F-D](https://reader035.vdocument.in/reader035/viewer/2022062713/56649cec5503460f949b8b65/html5/thumbnails/16.jpg)
• The reflection amplitudes at the finite-difference ‘quintuple’ point will be checked to see if the physics might be better understood.
Future work
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We would like to thank the CREWES sponsors for their generous support.
Acknowledgements