1 / 29

Outline

3D illumination analysis using wave equation based propagator Xiao-Bi Xie University of California, Santa Cruz Shengwen Jin Screen Imaging Technology Inc. Ru-Shan Wu University of California, Santa Cruz October, 2003, Dallas, Texas. Outline. O Introduction O Illumination analysis

corin
Télécharger la présentation

Outline

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 3D illumination analysis using wave equation based propagatorXiao-Bi XieUniversity of California, Santa CruzShengwen JinScreen Imaging Technology Inc.Ru-Shan WuUniversity of California, Santa CruzOctober, 2003, Dallas, Texas

  2. Outline OIntroduction O Illumination analysis O Directional illumination O Acquisition dip-response O 3D numerical examples using SEG/EAGE salt model O Summary

  3. Outline OIntroduction O Illumination analysis O Directional illumination O Acquisition dip-response O 3D numerical examples using SEG/EAGE salt model O Summary

  4. The seismic illumination analysis is a useful estimate that gives potential detecting power of a specific acquisition system for a given structure. Ray tracing based technique Provides both the intensity and direction information High efficient Limited by the high frequency asymptotic approximation Full-wave finite-difference method Usually provides only the total illumination Expensive One-way wave-equation based method Wave-equation based Local plane wave analysis to provide direction information 3D full-volume capability Consistent with the wave equation based migration/imaging

  5. Different methods for extracting localized angle information from migrated wavefields Ray tracing/Gaussian beam based technique give the wave propagation direction from the ray diagram Shot domain common image gather average direction between the source and the target Plane source directional source from the surface Offset-domain one-way wave equation method Offset plane wave Wavelet transform based method use wavelet transform to give information localized in both space and angle Local plane wave analysis Local plane wave analysis to provide directional information

  6. Angle domain analysis for extrapolated wavefields

  7. Outline OIntroduction OIllumination analysis O Directional illumination O Acquisition dip-response O 3D numerical examples using SEG/EAGE salt model O Summary

  8. Illumination analysis using ray based method (Muerdter 2001)

  9. Illumination analysis using wave equation based method

  10. A sketch showing (a) the directional illumination (DI) and (b) the acquisition dip-response (ADR).

  11. Acquisition system ADR DI Favorite target dip unfavorite target dip

  12. Outline OIntroduction O Illumination analysis ODirectional illumination O Acquisition dip-response O 3D numerical examples using SEG/EAGE salt model O Summary

  13. 3D SEG/EAGE Salt Model Locations of surface sources used for DI calculation, 3600 shots are usedto simulate marine type acquisition

  14. DI maps for 3D SEG/EAGE Salt Model V-model cross sections at y = 6100 m 45º left Vertical 45º right

  15. 3D SEG/EAGE Salt Model Locations of surface sources. 45 shots are used to simulate land type acquisition

  16. 3D SEG/EAGE Salt Model, 45 shot data set, comparisons between the model, total illumination, and Prestack depth image. Velocity model Total illumination cross sections at x = 6000 m Migration Image (Luo & Wu 2003)

  17. 3D SEG/EAGE Salt Model, 45 shot data set, comparisons between the model, vertical DI, and Prestack depth image. Velocity model vertical illumination cross sections at x = 8600 m Migration Image (Luo & Wu 2003)

  18. Outline OIntroduction O Illumination analysis O Directional illumination OAcquisition dip-response O 3D numerical examples using SEG/EAGE salt model O Summary

  19. 30 degree ADR for a single source-cable system (one shot plus three 3.2 km long cables) Cross section along the sail direction Depth slice at 1000 m

  20. Velocity model Vertical ADR Migration Image (Jin et al. 2002)

  21. Vertical ADR overlay on the prestack image

  22. Total ADR Velocity model Migration Image (Jin et al. 2002)

  23. Depth = f(x,y) Calculate the illumination on a target zone

  24. Outline OIntroduction O Illumination analysis O Directional illumination O Acquisition dip-response O 3D numerical examples using SEG/EAGE salt model OSummary

  25. Summary OA wave equation based method is developed for the illumination analysis. The GSP propagator and local plane wave analysis are used to extrapolate the wavefield and provide the directional information. OThe method provides a practical tool to conduct the 3D full-volume illumination analysis in complex structures. Both directional illumination (DI) and acquisition dip-response (ADR) can be generated. The method can be naturally teamed with the wave equation based migration method to provide illumination analysis. OAngle domain information is very useful. It adds a new dimension for us to look at the illumination. To demonstrate the potential applications of this method, preliminary numerical examples are calculated using the 3D SEG/EAGE salt model. For more information, please visit the Modeling and Imaging Lab booth at #2745.

  26. EOF

More Related