Green function retrieval

1
Green function retrieval versus Interferometric
imaging Kees Wapenaar Deyan Draganov Delft
University of Technology 2005 Joint Assembly May
25, 2005 New Orleans
2
Contents
Greens function retrieval Interferometric
imaging Comparison
3
(No Transcript)
4
Contents
Greens function retrieval Interferometric
imaging Comparison
5
Phys. Rev. Lett., 2004, 93 (25), 254301-1 -
254301-4
6
Phys. Rev. Lett., 2004, 93 (25), 254301-1 -
254301-4
7
Phys. Rev. Lett., 2004, 93 (25), 254301-1 -
254301-4
8
Phys. Rev. Lett., 2004, 93 (25), 254301-1 -
254301-4
9
1500 m/s
2000 m/s
Retrieval of reflection response acoustic
approximation
10
(No Transcript)
11
(No Transcript)
12
1500 m/s
2000 m/s
Uncorrelated noise sources
13
(variable )
14
Contents
Greens function retrieval Interferometric
imaging Comparison
15
(No Transcript)
16

• Forward extrapolation of source
• Inverse extrapolation of receiver
• Cross-correlation
• Integrate along receivers

17

• Forward extrapolation of source
• Inverse extrapolation of receiver
• Cross-correlation
• Integrate along receivers
• Repeat for all subsurface points

18
Schuster, EAGE 2001, GJI 2004 Artman et al., EAGE
2004 Draganov et al., SEG 2004
19
Contents
Greens function retrieval Interferometric
imaging Comparison
20
Greens function retrieval Integration along
sources
21
Greens function retrieval Integration along
sources
Interferometric imaging
22
Greens function retrieval Integration along
sources
Interferometric imaging Integration along
receivers
23
Greens function retrieval Integration along
sources
Interferometric imaging Integration along
receivers
24
Passive Seismic Imaging in Complex Media
Numerical comparison with varying number of
underground sources
Reconstructed depth image
Directly modelled reflection response
Reconstructed reflection response
33 minutes of white noise recording with 225
subsurface sources
25
Passive Seismic Imaging in Complex Media
Numerical comparison with varying number of
underground sources
Reconstructed depth image
Directly modelled reflection response
Reconstructed reflection response
6 minutes of white noise recording with 113
subsurface sources
26
Passive Seismic Imaging in Complex Media
Numerical comparison with varying number of
underground sources
Reconstructed depth image
Directly modelled reflection response
Reconstructed reflection response
6 minutes of white noise recording with 57
subsurface sources
27
Passive Seismic Imaging in Complex Media
Numerical comparison with varying number of
underground sources
Reconstructed depth image
Directly modelled reflection response
Reconstructed reflection response
6 minutes of white noise recording with 11
subsurface sources
28
Passive Seismic Imaging in Complex Media
Numerical comparison with varying number of
underground sources
Reconstructed depth image
Directly modelled reflection response
Reconstructed reflection response
6 minutes of white noise recording with 6
subsurface sources
29
Conclusions

• Greens function retrieval
• diffuse wave fields
• non-diffuse wave fields representation theory
• many sources required
• primaries and multiples (coda)
• no medium information required
• Interferometric imaging
• diffuse or non-diffuse wave fields
• few sources required
• primaries only (multiples imaged as ghosts)
• background medium required

30
(No Transcript)