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The Earth’s Near Surface as a Vibroseis Signal Generator

The Earth’s Near Surface as a Vibroseis Signal Generator. Zhiyong Jiang. University of Utah. Outline. Introduction Methodology Synthetic Data Test Conclusions. Motivation: in Indonesia gas hydrates blur the reflections. g. s. s’. x. Outline. Introduction Methodology

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The Earth’s Near Surface as a Vibroseis Signal Generator

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  1. The Earth’s Near Surface as a Vibroseis Signal Generator Zhiyong Jiang University of Utah

  2. Outline • Introduction • Methodology • Synthetic Data Test • Conclusions

  3. Motivation: in Indonesia gas hydrates blur the reflections g s s’ x

  4. Outline • Introduction • Methodology • Synthetic Data Test • Conclusions

  5. Review: 1st-order Multiple Imaging with Crosscorrelation Migration g s’ s X

  6. Review: 1st-order Multiple Imaging with Crosscorrelation Migration g s’ s X

  7. Review: Near Surface Scattering Decon. s g s’ X

  8. Review: Near Surface Scattering Decon. s g s’ X

  9. EAV g s’ s x

  10. EAV g s’ s x

  11. Why name it “EAV” (Earth as a vibroseis signal generator) Vibroseis trace Pilot signal g s’ s x

  12. Outline • Introduction • Methodology • Synthetic Data Test • Conclusions

  13. Velocity Model X (m) 6750 0 0 Depth (m) 2000 Shots: 676; Receivers: 50 (1100m -1600m)

  14. Downgoing component Upgoing component S S G G X X 1500m 1500m 1180m 1180m CSG 333 0 Time (s) 6 1500m 1180m

  15. Early part (pilot signal) Late part (vibroseis trace) CRG 33 0 Time (s) 6 0 6750 X (m)

  16. EAV to Upgoing Component g’ s 0 Depth (m) g x 2000 0 6750 X (m)

  17. EAV to Downgoing Component g’ s 0 Depth (m) x g 2000 0 6750 X (m)

  18. Primary Migration Image s 0 Depth (m) g x 2000 0 6750 X (m)

  19. 1st-order Multiple with Crosscorrelation Migration g’ s 0 Depth (m) x g 2000 0 6750 X (m)

  20. EAV to Downgoing Component g’ s 0 Depth (m) x g 2000 0 6750 X (m)

  21. Outline • Introduction • Methodology • Synthetic Data Test • Conclusions

  22. Conclusion • Free surface points can be regarded as vibroseis signal generator, and direct waves, primary reflections, multiple reflections can be regarded as the pilot signal, the response can be thought of as vibroseis trace • With EAV, a ringy trace can be compressed into an impulsive primary reflection

  23. Future work: use EAV to deblur the scattering due to gas hydrates near the sea floor vibroseis trace Pilot signal g s s’ x

  24. Acknowledgments We thank UTAM sponsors for their financial support

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