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AttributesAttributesUH Energy
Numerical ModelingNumerical Modeling
Prestack Data AnalysisPrestack Data Analysis
Data ProcessingData Processing
Seismic InterpretationSeismic Interpretation
Quantitative InterpretationQuantitative Interpretation
Prospect GenerationProspect Generation
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CCS Team
CCS = Carbon Capture and Sequestration
UH Energy
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Direct Imaging of group velocity dispersion curves in shallow water
Christopher Liner (Univ. of Houston, AGL)Lee Bell and Richard Verm (Geokinetics)
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Introduction Shallow water wave guide
Pekeris (1948) Normal mode theory
• EJP (1957), Officer (1958), Budden (1962)• Beware notation and mode numbering scheme
Imaging of phase vel dispersion curves McMechan and Yedlin (1981)
• Fourier method• 2D, regular offset sampling
Park et al.(1998)• Direct integration method
• 2D or 3D, irregular offsets
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Phase and Group Velocity
X1 X2
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Theory of Guided Wave Modes
c = phase velocity
U = c + f (dc/df) = group velocity
Period equation
m = mode = 0, 1, 2, …
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Example
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Field Data 3D Shot record
4C Ocean bottom cable• (p,x,y,z)
Offshore Australia Three parallel receiver lines
• Total 880 groups
Processing Component extraction 5 Hz low-cut filter
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Shot Record
P Component
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CWT of Selected Traces
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Offset 4194 m
v(f)=x/t
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Phase Velocity Fit
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Phase & Group Velocity Fit
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Phase & Group Velocity Fit
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Conclusions
Direct dispersion curve imaging tools Phase velocity since 1981 Group velocity…now
• Tuned continuous wavelet transform• Requires one prestack trace
Demonstrated on field data Estmation of waveguide parameters
• Phase + Group = more information
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Any Questions?