Shallow P and S velocity structure Red Deer, Alberta · Cygnet field, Red Deer, Alberta....
Transcript of Shallow P and S velocity structure Red Deer, Alberta · Cygnet field, Red Deer, Alberta....
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Shallow P and S velocity structureRed Deer, Alberta
Don Lawton, Meredith McArthurRachel Newrick & Sarah Trend
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Cygnet field, Red Deer, Alberta
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Stratigraphy of the Ardley coals
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Cased hole logs, Cygnet
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Vertical Vp/Vs
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Vertical component, walkway VSP
100 m 150 m
244 m191 m
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P-wave first arrival traveltime analysis
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P-wave velocity model and turning rays
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Vertical component
( )
100 m 150 m 191 m 241 m
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Radial component
100 m 150 m 191 m 241 m
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Transverse component
100 m 150 m 191 m 241 m
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SV-wave first arrival traveltime analysis
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Time (ms)R
ecei
ver D
epth
(m)
Observed Modeled
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SV-wave velocity model and turning raysVo(m/s) k(s-1)
425 7
600 8
850 6
1180
1200 10
1450 18
1000 12
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Dep
th (
m)
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P-wave incident angle at well
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Incident Angle
Dep
th (m
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Calculated Observed
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-60 -40 -20 0 20 40 60 80
Incident Angle
Dep
th (m
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Calculated Observed
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-60 -40 -20 0 20 40 60 80
Incident Angle
Dep
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Calculated Observed
θ
P-wave
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SV-wave incident angle at well
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-60 -40 -20 0 20 40 60 80
Incident Angle
Dep
th (m
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Observed Calculated
0
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-60 -40 -20 0 20 40 60 80
Incident Angle
Dep
th (m
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Calculated Observed
0
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-60 -40 -20 0 20 40 60 80
Incident Angle
Dep
th (m
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Calculated Observed
θ
SV-wave
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Conclusions
• Turning rays are present at Cygnet
• Velocity gradients up to 10 s-1 for P-waves
• Velocity gradients up to 8 s-1 for SV waves
• Weak P-wave anisotropy observed
• Incident angle analysis generally supports raytracing results
• Study provides insights into P-S statics
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Acknowledgements
• CREWES sponsors• NSERC• Alberta Energy Research Institute• Cygnet project sponsors• GX-Technology• Landmark Graphics• Alberta Ingenuity Fund