Imaging Multiple Reflections with Reverse- Time Migration Yue Wang University of Utah.

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Presentation transcript:

Imaging Multiple Reflections with Reverse- Time Migration Yue Wang University of Utah

Outline BackgroundBackground Motivation & ObjectiveMotivation & Objective MethodologyMethodology Numerical ExamplesNumerical Examples ConclusionsConclusions

Forward Process Distance (km) Depth (km) * Source Geophone Line

Forward Process Distance (km) Depth (km) *  obs

Reverse Time Migration Distance (km) Depth (km)  obs Extrapolated Wavefield  obs Reversed traces

Reverse-Time Migration Extrapolated Wavefield Imaging Condition Migration Section

Outline BackgroundBackground Motivation & ObjectiveMotivation & Objective MethodologyMethodology Numerical ExamplesNumerical Examples ConclusionsConclusions

Ocean-Bottom Survey Distance (km) Depth (km) * Source Geophone Line

Problem Distance (km) Depth (km) * Receiver-side Multiples

Synthetic Shot Gather Time (s) Distance (km) Receiver side multiples

Field Data Time (s) Distance (m) Receiver side multiples

Time Migration Time (s) Distance (m) Receiver side multiples

Objective Using both primary and multiple reflections for imaging by reverse- time migration.Using both primary and multiple reflections for imaging by reverse- time migration.

Outline BackgroundBackground Motivation & ObjectiveMotivation & Objective MethodologyMethodology Numerical ExamplesNumerical Examples ConclusionsConclusions

Ocean-Bottom Survey Distance (km) Depth (km) * Source Geophone Line

Ocean-Bottom Survey Distance (km) Depth (km) *PV Up-going

Multi-Component Data pressure + particle velocity ( P & V ) ocean-bottom survey

Reverse Time Migration Distance (km) Depth (km) 1 0 0PV Down-going PV ( P & V Scheme )

Reverse Time Migration Distance (km) Depth (km) 1 0 0VV ( Particle Velocity Only )

Key Idea Primary + Multiple Correct Positions P & V Scheme

Key Idea Primary + Multiple Incorrect Positions V-Only Scheme

Ocean-Bottom Survey Distance (km) Depth (km) *PV Up-going Waves

P & V Scheme Distance (km) Depth (km) 1 0 0PVPV Correct Position Down-going waves

Particle Velocity Only Scheme Distance (km) Depth (km) 1 0 0VV Incorrect

Ocean-Bottom Survey Distance (km) Depth (km) *PV Down-going waves ( Multiples )

P & V Scheme Distance (km) Depth (km) 1 0 0PVPV Correct Position Up-going waves

Particle Velocity Only Scheme Distance (km) Depth (km) 1 0 0VV Incorrect

Outline BackgroundBackground Motivation & ObjectiveMotivation & Objective MethodologyMethodology Numerical ExamplesNumerical Examples Salt Dome Model Salt Dome Model ConclusionsConclusions

Salt Model Distance (km) Depth (km)

Shot Gather Normal Stress VerticalHorizontal Time (s) Distance (km) Multiples

Kirchhoff Migration Distance (km) Depth (km)

Kirchhoff Migration Distance (km) Depth (km)

Particle Velocity Only Scheme Distance (km) Depth (km)

Particle Velocity Only Scheme Distance (km) Depth (km)

P & V Scheme Distance (km) Depth (km)

Distance (km) Depth (km) P & V Scheme

Primary + Multiple Correct Positions Conclusion P + V RTM

Future Work: Field Data Test Time (s) Distance (m) Receiver side multiples

Acknowledgement We are grateful to the 1999 sponsors of the UTAM consortium for the financial support

Outline BackgroundBackground Motivation & ObjectiveMotivation & Objective MethodologyMethodology Numerical ExamplesNumerical Examples Plane-wave example Plane-wave example ConclusionsConclusions

Forward Process Distance Depth Up-going waves

P & V Scheme Distance Depth Down-going waves

P & V Scheme Time (s) Depth (km) Down-going waves

Particle Velocity Only Scheme Distance Depth Down-going waves Up-going waves

Particle Velocity Only Scheme Time (s) Depth (km) Down-going waves Up-going waves

P + V RTM Distance (km) Depth (km) 100 P+V Up-going waves Correct Position Distance (km) Depth (km) P Down-going waves Up-going waves