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Interferometric Extraction of SSP from Passive Seismic Data

Interferometric Extraction of SSP from Passive Seismic Data. Yanwei Xue Feb. 7, 2008. OUTLINE. Motivation Theory Field data test Conclusions and the way ahead. Motivation. Why?. No individual experiment required. Can get Green’s function between two randomly selected receivers.

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Interferometric Extraction of SSP from Passive Seismic Data

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  1. Interferometric Extraction of SSP from Passive Seismic Data Yanwei Xue Feb. 7, 2008

  2. OUTLINE • Motivation • Theory • Field data test • Conclusions and the way ahead

  3. Motivation Why? • No individual experiment required • Can get Green’s function between two randomly selected receivers How? • Interferometric Transform

  4. OUTLINE • Motivation • Theory • Field data test • Conclusions and the way ahead

  5. S 0 . . A B P(B) =∫ G(B|x)N(x)d x 2 S src Im[G(A|B)] = k<p(A)*p(B)> = k∫ G(B|x)G(A|x)*d x x 2 S src z x’ S src Random Sources <N(x)*N(x’)> =δ(x-x’)S(ω)

  6. Random Scatterers

  7. Input data d Truncate d in time into several data panels Crosscorrelate each trace with a given trace at x Output Sum and average the crosscorrelation panels Workflow

  8. OUTLINE • Motivation • Theory • Field data test • Conclusion and the way ahead

  9. Data Introduction Receiver position 8 receiver lines 779 receivers Receiver interval: 27 - 30 m 6100 3 4 2 Y (m) 5 1 6 8 7 0 0 6100 X (m)

  10. Trace Example Amplitude 0 Time (s) 960

  11. 0.0 Time (s) 2.4 X (m) 2500 0 Virtual Shot Gather Receiver line 6 90 receivers Frequency used to do the interferometry is 1 - 11.5 Hz Event velocity 1450 m/s

  12. 0.0 Time (s) 2.4 X (m) 2500 0 Virtual Shot Gather Receiver line 6 90 receivers Frequency used: 1 – 9 Hz Event velocity 1450 m/s

  13. 0.0 Time (s) 2.4 X (m) 2500 0 Virtual Shot Gather Receiver line 8 95 receivers Frequency used: 1 - 9 Hz Event velocity 1455 m/s

  14. 0.0 Time (s) 2.4 X (m) 2500 0 Virtual Shot Gather Receiver line 2 90 receivers Frequency used: 1 - 5 Hz

  15. 0.0 Time (s) 2.4 X (m) 2500 0 Virtual Shot Gather Receiver line 2 90 receivers Frequency used: 1 - 44 Hz Left-going events removed

  16. OUTLINE • Introduction • Theory • Field data test • Conclusions and the way ahead

  17. Conclusions • Field data test gives continuous events • Low frequency results have a velocity of 1450 m/s • High frequency (1 - 44 Hz) results look like reflections • We need records with longer time to get better results

  18. Road Ahead • Test the data with longer time records • Velocity analysis of the virtual gathers • Migrate the virtual data

  19. Thanks!

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