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passive seismic imaging

passive seismic imaging. Brad Artman. passive imaging importance of 3D migration teleseisms breaking waves north sea reservoir. passive imaging. not event location structural imaging

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passive seismic imaging

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  1. passive seismic imaging Brad Artman

  2. passive imaging • importance of 3D • migration • teleseisms • breaking waves • north sea reservoir

  3. passive imaging • not event location • structural imaging • reflection seismology: subsurface investigation from the time-delayed reflections of sound off of geologic variations. • passive imaging: with no application of controlled experimental sources, a relationship between a recorded transmission wavefield and reflection wavefields is required. • requires: stationary seismometers, lots of disk space

  4. capitalizing on ambient noise • earthquake arrivals • ocean waves • wind vibrations coupled with foundations • cultural activity • vehicle and boat traffic • drilling noise • nearby seismic acquisition

  5. transmission wavefield position(m) position(m) time (s) depth (m)

  6. ambient noise r1 r2 r1 r2 t

  7. ambient noise r1 r2 r1 r2 t

  8. ambient noise r1 r2 r1 r2 t

  9. ambient noise r1 r2 r1 r2 r1 r1 r1 r2 t lag

  10. ambient noise r1 r2 r1 r2 r1 r1 r1 r2 t twt

  11. ambient noise r1 r2 r1 r2 r1 r1 r1 r2 t twt

  12. backscattered PP r1 r2 r1 r2 r1 r1 r1 r2 t twt

  13. position(m) offset(m) 0 200 300 400 600 1200 100 0 0 0.1 5 10 lag(s) time(s) 0.3 20 25 30

  14. position(m) offset(m) 0 200 300 600 1200 -100 100 0 0 0.1 5 10 lag(s) time(s) 0.3 20 25 30

  15. offset(m) position(m) 0 200 -200 -100 100 600 1200 0 0 0.1 5 10 lag(s) time(s) 0.3 20 25 30

  16. offset(m) position(m) 0 -300 -200 -100 100 600 1200 0 0 0.1 5 10 lag(s) time(s) 0.3 20 25 30 2 n long traces n short traces

  17. passive imaging • importance of 3D • migration • teleseisms • breaking waves • north sea reservoir

  18. The Sun as a Laboratory Rickett SEP-100 Acoustic Daylight Imaging via spectral factorization,

  19. 2D Experiment 1 Receiver line

  20. Break Point?

  21. Whole Data Volume

  22. 8 Consecutive Lines

  23. 8 Spaced Lines

  24. passive imaging • importance of 3D • migration • teleseisms • breaking waves • north sea reservoir

  25. active synthetic active migration reflection gather

  26. passive synthetic passive migration correlated passive gather

  27. passive synthetic passive migration correlated passive gather

  28. passive imaging • importance of 3D • migration • teleseisms • breaking waves • north sea reservoir

  29. 2.5 D Vapp = V/cos(f)

  30. earthquake energy

  31. passive imaging • importance of 3D • migration • teleseisms • breaking waves • north sea reservoir

  32. Artman GeoServices

  33. Enlarged data set

  34. 5min Night

  35. 5min Night

  36. 10min Day

  37. passive imaging • importance of 3D • migration • teleseisms • breaking waves • north sea reservoir

  38. Valhall • one of the North sea giant fields • partners Amerada Hess, Shell and Total • reservoir highly porous chalk • first production 1982 • field life 2028

  39. Valhall Life of Field Seismic • Permanent field wide seismic array installed at Valhall during 2003 • 120 km seismic cables • 2414 groups of 4C sensors • Covers 45sq km

  40. Oyo-Geospace cable

  41. Valhall data

  42. Valhall data 3 days, 2300 4C recievers 1.2 Tbytes

  43. Depth slice near 88m Valhall data trace # energy localized around rig moveout across traces suggests surface noise

  44. Valhall data rig activity mono-freq. boat noise Reflector?

  45. Valhall pipe cut image 12km 4km

  46. Valhall active seismic 12km 4km

  47. thank you

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