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Passive Seismic Imaging in North Sea Reservoir: Importance of 3D Migration

Explore the significance of 3D migration in passive seismic imaging for structural subsurface investigations. Learn about the utilization of ambient noise and its impact on reflection seismology, without controlled sources. Discover the seismic data acquisition process involving stationary seismometers and a large disk space. Dive into the analysis of earthquake arrivals, ocean waves, and other ambient noise sources influencing imaging results.

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Passive Seismic Imaging in North Sea Reservoir: Importance of 3D Migration

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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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