1. Passive Seismic ImagingStanford Exploration Project passive seismic imaging Brad Artman

2. Passive Seismic ImagingStanford Exploration Project passive imaging importance of 3D migration teleseisms breaking waves north sea reservoir

3. Passive Seismic ImagingStanford Exploration Project 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. Passive Seismic ImagingStanford Exploration Project 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. Passive Seismic ImagingStanford Exploration Project transmission wavefield time (s) depth (m) position(m)

6. Passive Seismic ImagingStanford Exploration Project ambient noise r1r2 t r1r2

7. Passive Seismic ImagingStanford Exploration Project ambient noise r1r2 t r1r2

8. Passive Seismic ImagingStanford Exploration Project ambient noise r1r2 t r1r2

9. Passive Seismic ImagingStanford Exploration Project ambient noise r1r2 t r1 r1 r1 r2 lag r1r2

10. Passive Seismic ImagingStanford Exploration Project r1r2 t r1 r1 r1 r2 twt r1r2 ambient noise

11. Passive Seismic ImagingStanford Exploration Project r1r2 t r1 r1 r1 r2 twt r1r2 ambient noise

12. Passive Seismic ImagingStanford Exploration Project backscattered PP r1r2 t r1 r1 r1 r2 twt r1r2

13. Passive Seismic ImagingStanford Exploration Project ambient noise r1r2 t r1 r1 r1 r2 lag twt r1r2

14. Passive Seismic ImagingStanford Exploration Project 0 1200600 position(m) 20 25 30 time(s) 5 10 0200 100 lag(s) 0 0.1 0.3 400300 offset(m)

15. Passive Seismic ImagingStanford Exploration Project 0 1200600 position(m) 20 25 30 time(s) 5 10 0 -100 200 100 lag(s) 0 0.1 0.3 offset(m) 300

16. Passive Seismic ImagingStanford Exploration Project 0 1200600 position(m) 20 25 30 time(s) 5 10 0 -100-200 200 100 lag(s) 0 0.1 0.3 offset(m)

17. Passive Seismic ImagingStanford Exploration Project 0 1200600 position(m) 20 25 30 time(s) 5 10 0 -100-200100 lag(s) 0 0.1 0.3 offset(m) -300 n long traces n short traces 2

18. Passive Seismic ImagingStanford Exploration Project passive imaging importance of 3D migration teleseisms breaking waves north sea reservoir

19. Passive Seismic ImagingStanford Exploration Project The Sun as a Laboratory Acoustic Daylight Imaging via spectral factorization, Rickett SEP-100

20. Passive Seismic ImagingStanford Exploration Project 2D Experiment 1 Receiver line

21. Passive Seismic ImagingStanford Exploration Project Break Point?

22. Passive Seismic ImagingStanford Exploration Project Whole Data Volume

23. Passive Seismic ImagingStanford Exploration Project 8 Consecutive Lines

24. Passive Seismic ImagingStanford Exploration Project 8 Spaced Lines

25. Passive Seismic ImagingStanford Exploration Project passive imaging importance of 3D migration teleseisms breaking waves north sea reservoir

26. Passive Seismic ImagingStanford Exploration Project active synthetic reflection gather active migration

27. Passive Seismic ImagingStanford Exploration Project passive synthetic correlated passive gather passive migration

28. Passive Seismic ImagingStanford Exploration Project correlated passive gather passive migration passive synthetic

29. Passive Seismic ImagingStanford Exploration Project passive imaging importance of 3D migration teleseisms breaking waves north sea reservoir

30. Passive Seismic ImagingStanford Exploration Project 2.5 D V app = V/cos (  )

31. Passive Seismic ImagingStanford Exploration Project earthquake energy

32. Passive Seismic ImagingStanford Exploration Project passive imaging importance of 3D migration teleseisms breaking waves north sea reservoir

33. Passive Seismic ImagingStanford Exploration Project Artman GeoServices

34. Passive Seismic ImagingStanford Exploration Project Enlarged data set

35. Passive Seismic ImagingStanford Exploration Project 5min Night

36. Passive Seismic ImagingStanford Exploration Project 5min Night

37. Passive Seismic ImagingStanford Exploration Project 10min Day

38. Passive Seismic ImagingStanford Exploration Project passive imaging importance of 3D migration teleseisms breaking waves north sea reservoir

39. Passive Seismic ImagingStanford Exploration Project Valhall one of the North sea giant fields partners Amerada Hess, Shell and Total reservoir highly porous chalk first production1982 field life2028

40. Passive Seismic ImagingStanford Exploration Project 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

41. Passive Seismic ImagingStanford Exploration Project Oyo-Geospace cable

42. Passive Seismic ImagingStanford Exploration Project operations

43. Passive Seismic ImagingStanford Exploration Project Valhall data

44. Passive Seismic ImagingStanford Exploration Project Valhall data 3 days, 2300 4C recievers 1.2 Tbytes

45. Passive Seismic ImagingStanford Exploration Project Valhall data trace # Depth slice near 88m energy localized around rig moveout across traces suggests surface noise

46. Passive Seismic ImagingStanford Exploration Project Valhall data Reflector? mono-freq. boat noise rig activity

47. Passive Seismic ImagingStanford Exploration Project Valhall pipe cut normalization 4km 12km

48. Passive Seismic ImagingStanford Exploration Project Valhall pipe cut image 4km 12km

49. Passive Seismic ImagingStanford Exploration Project Valhall active seismic 4km 12km

50. Passive Seismic ImagingStanford Exploration Project thank you

51. Passive Seismic ImagingStanford Exploration Project Valhall pipe cut image 4km 12km