seismic workshop presentation: jacques jenny phd w_geosoft / geo2 x switzerland
TRANSCRIPT
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Seismic workshop
Presentation: Jacques Jenny PhDW_GeoSoft / Geo2X Switzerland
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Type of seismic waves
Average P and S velocities- P waves velocity: 1000 to 5000 m/s- S wave velocity: 300 to 1000 m/s
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Seismic waves propagation
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Seismic method overviewMethod Equipment Depth Use Processing
Refraction 12 -24 channels
1-50 m EngineeringLandslide
Easy to complex
Reflection 48 – 96 channels
50 – x00 m EngineeringOil water prospect.
Difficult to very complex
Surface waves
24 – 48 channels
10 – 50 m Engineering Complex
DownholeCrosshole
Triaxial geophone
1-100 m Engineering Complex
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Refraction versus reflection
refraction.swf reflexion.swf
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Processing result
Refraction seismic
Reflection seismic
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Surface waves
Downhole seismic
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Equipment• Recording equipment• Seismic source• Processing software
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Recording equipment
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Seismic source
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SN388
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Seismic source
Buffalo gun
Drop weight 300 kg
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Processing softwareRefraction: WinSism,Plotrefa,RayfractReflection: Visual SUNT, ReflexSurface wave: WinMASW, SurfSEIS, SeisImagerDownhole: WinDownHole