Utah Tomography and Modeling/Migration Development Project





1998 Annual Report

J. Chen, J. Hu, G. Schuster,
D. Sheley, J. Sheng, H. Sun, Y. Wang, J. Yu and H. Zhang

February 9, 1999

 

• Contents
  • Preface
• Migration Analysis
  • Application of Poststack Migration Deconvolution to 3D Data
    
    • ABSTRACT
    • INTRODUCTION
    • NUMERICAL EXPERIMENTS
      • French Model
      • 3D Field Poststack Reverse Time Migration Data Set
      • 3D Prestack Kirchhoff Migration Data Set
      • Comparison of MD image with conventional deconvolution method
      • Practical Implementation
    • CONCLUSIONS
    • ACKNOWLEDGEMENT
    • REFERENCES
  • Poststack Migration Deconvolution
    
    • ABSTRACT
    • INTRODUCTION
    • PRINCIPLE OF MIGRATION DECONVOLUTION
      • Practical Implementation
    • SYNTHETIC AND FIELD DATA EXAMPLES
      • Point Scatterer Test
      • Meandering Stream Model
      • Overthrust Model
      • North Sea Field Data
    • CONCLUSIONS AND DISCUSSION
    • REFERENCES
  • Correction of Cable Feathering and Velocity Errors by Migration Deconvolution
    
    • ABSTRACT
    • INTRODUCTION
    • NUMERICAL EXPERIMENTS
      • Velocity Tolerance
      • Elevation Variation Tolerance
      • Geometry Variation for 2D Prestack Data Set
      • 3D migration model A: Post-Stack Migration
      • 3D Migration Model B: Pre-stack Migration
    • CONCLUSIONS
    • ACKNOWLEDGEMENT
    • REFERENCES
  • Wavepath Migration versus Kirchhoff Migration: Theory and Poststack Examples
    
    • ABSTRACT
    • INTRODUCTION
    • STATIONARY PHASE GREENS FUNCTION FOR ZERO-OFFSET MIGRATION
      • Case of a Reflector in a Homogeneous Medium
      • Reflection Tomography without Interface Parameterization
    • IMPLEMENTATION OF WAVEPATH MIGRATION ALGORITHM
      • Traveltime Picking
      • Incidence Angle
      • Partial Trace Summation
      • Shooting Ray Tracing
      • Fresnel Zone
      • Weighted Migration
    • NUMERICAL RESULTS
      • 2-D Point Scatterer Model
      • SEG Overthrust Model
      • Mobil North Sea Data
    • DISCUSSION
    • ACKNOWLEDGEMENTS
    • REFERENCES
  • Wavepath Migration versus Kirchhoff Migration: Prestack Examples
    
    • ABSTRACT
    • INTRODUCTION
    • PRESTACK WAVEPATH MIGRATION WITH SLANT STACKING
    • NUMERICAL RESULTS
      • 2-D Point Scatterer Model
      • SEG Overthrust Model
      • Mobil North Sea Data
      • 3-D Point Scatterer Model
    • DISCUSSION
    • ACKNOWLEDGEMENTS
    • REFERENCES
  • Stationary Phase Approach To True Amplitude Migration
    • ABSTRACT
    • INTRODUCTION
    • BLEISTEIN'S DERIVATION
    • PROBLEMS WITH THE INTEGRATION OVER THE FULL DATA APERTURE
      • Multiple reflectors and multiple shot gathers
      • Migration artifacts amplification with true amplitude weight function
    • NUMERICAL EXAMPLE
    • SCHLEICHER'S MINIMUM APERTURE MIGRATION
    • REFLECTOR-BASED REMIGRATION
    • CONCLUSION
    • ACKNOWLEDGEMENTS
    • REFERENCES
  • True-amplitude Imaging By Reflector-based Remigration
    • ABSTRACT
    • INTRODUCTION
    • REFLECTOR-BASED REMIGRATION
    • NUMERICAL TESTS: TWO LAYER MODEL
      • Ray-theoretical seismic data
      • Finite-difference seismic data
      • Reflector positions and dips obtained from Kirchhoff image
    • NUMERICAL TESTS: EXXON VSP MODEL
    • CONCLUSION
    • FUTURE WORK
    • ACKNOWLEDGEMENTS
    • REFERENCES
  • Migration of Transmitted PS Arrivals from Ore Bodies and Salt Flanks
    
    • ABSTRACT
    • INTRODUCTION
    • THEORY OF PS MIGRATION
    • NUMERICAL RESULTS
      • Forward Modeling Results
      • VSP Data over a Salt Diapir
      • Salt Model with Layered Background
      • Ore Body Model
      • Migration Results
      • VSP over Salt Diapir
      • Ore Body Model
      • Kidd Crosswell Data
    • CONCLUSION
    • ACKNOWLEDGEMENTS
  • Maximum Entropy Migration
    
    • ABSTRACT
    • INTRODUCTION
    • METHODOLOGY
      • LSM with a Regularization Method
      • Theory of Entropy Regularization
      • Implementation of LSM with Entropy Regularization
    • NUMERICAL RESULTS AND DISCUSSIONS
      • Synthetic Data Tests
      • Case I: True velocity model
      • Case II: velocity with an error
      • Case: III: Overthrust model
      • Case: IV: Marine field data
    • SUMMARY
    • ACKNOWLEDGEMENTS
    • REFERENCES
• Migration Velocity Analysis
  • Generalization of Velocity Continuation to Arbitrary Migration Velocity
    • ABSTRACT
    • INTRODUCTION
    • PDE's OF MIGRATION IMAGES
      • Application to Velocity Analysis
    • CONCLUSIONS AND DISCUSSION
    • REFERENCES
  • Migration Velocity Analysis
    • ABSTRACT
    • INTRODUCTION
    • SEG OVERTHRUST MODEL
      • 2-D prestack migration with accurate velocity
      • 2-D prestack migration with inaccurate velocity
    • OBTAINING INFORMATION FROM THE MIGRATED IMAGES
      • Automatic picking of residual depth moveouts
      • Automatic picking of reflector positions
      • Determination of source and receiver coordinates by stationary phase method
      • Ray tracing
    • FUTURE WORK
    • ACKNOWLEDGEMENTS
    • REFERENCES
• Tomography
  • Reflection Traveltime Tomography Using Dynamic Smoothing
    
    • ABSTRACT
    • INTRODUCTION
    • METHODOLOGY
    • SUMMARY
    • REFERENCES
  • Extended Diffraction-Slice Theorem for Wavepath Traveltime Tomography
    
    • ABSTRACT
    • INTRODUCTION
    • METHODOLOGY
      • Rytov approximation
      • Asymptotic solution
      • Crosswell constant background example
    • SUMMARY
    • REFERENCES
    • APPENDIX A: Asymptotic solution
    • APPENDIX B: Crosswell constant background example
  • Processing the Noranda Kidd Creek Crosswell Data
    
    • ABSTRACT
    • INTRODUCTION
    • METHODOLOGY
    • DISCUSSION OF RESULTS
    • CONCLUSIONS
• Modeling Methods
  • 3D Traveltime Calculation for Anisotropic Media
    
    • ABSTRACT
    • INTRODUCTION
    • WAVE EQUATION TRAVELTIME SOLVERS
      • Acoustic VTI Wave Equation Traveltime Solver
      • General VTI Wave Equation Traveltime Solver
    • FD EIKONAL EQUATION TRAVELTIME SOLVER
      • Solving the Eikonal Equation for General Anisotropic Media
      • Expanding Wavefront (EW) Method
      • Fast Matching (FM) Method
      • Tests on EW and FM Methods
      • Hamilton-Jacobi Solver
    • DISCUSSION AND FUTURE WORK
    • ACKNOWLEDGEMENT
    • REFERENCE
• Multiple Elimination Methods
  • Comparison of Multiple Attenuation Methods with Least-Squares Migration Filtering
    
    • ABSTRACT
    • INTRODUCTION
    • METHODOLOGY
      • LSMF for Multiple Attenuation
      • 2D Predictive Deconvolution
      • Wavefield-extrapolation Method
      • Wave-equation Method
    • SYNTHETIC TESTS
      • LSMF Method
      • 2D Predictive Deconvolution
      • Wavefield-extrapolation Method
      • Wave-equation Method
    • UNOCAL FIELD DATA SET
    • CONCLUSION AND DISCUSSION
    • ACKNOWLEDGEMENTS
    • REFERENCE
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