1. Seismic Interferometry and 3x3 Classification Matrix..

2. Predicting Multiples & Primaries
1. Turn Primaries into Multiples, then Subtract *
2. Turn Multiples into Primaries, then Migrate
Key Point: Every Bounce Pt on Surface Acts a New Virtual Source

3. Predicting Multiples from Primaries2
Predicting Multiples from Primaries
Turn Multiples into Primaries, then Migrate B x A x A A B
G(B|x)
G(A|x) S x *
= G(A|B)
Key Point #1: Common Raypath Cancels
Key Point #2: Every Bounce Pt on Surface Acts a New Virtual Source
Key Point #3: Summation over Sources Picks out Specular Contribution

4. Correlation Redatuming
2D Reflection Data ! k x
= G(A|B)
G(A|x)*
G(B|x) B A x B A x B A x
Key Point #5: Kills Source Statics and no need to know src location or excitation time
Key Point #6: Huge increase in Illumination Area

5. Correlation Redatuming
VSP ->SSP ! k x
= G(A|B)
G(A|x)*
G(B|x)
Standard VSP Primary
VSP -> SSP

6. VSP Multiple (12 receivers 13 kft @ 30 ft spacing; 500 shots)
5000
Depth (ft)
13000
X (ft)
56000
TLE, Jiang et al., 2005

7. TLE, Jiang et al., 2005 Surface Seismic Depth (ft) X (ft) 5000 13000
X (ft)
56000
TLE, Jiang et al., 2005

8. VSP Multiple (12 receivers 13 kft @ 30 ft spacing; 500 shots)
5000
Depth (ft)
13000
X (ft)
56000
TLE, Jiang et al., 2005

9. 3D SEG Salt Model Test
(He, 2006)

10. VSP Multiples Migration
Stack of 6 receiver gathers
( Courtesy of P/GSI: ~¼ million traces, ~3 GB memory, ~4 hours on a PC )
(He, 2006)

11. Interferometry Summary! k x
= G(A|B)
G(A|x)*
G(B|x) B A x B A x B A x
Key Point #1: Common Raypath Cancels
Key Point #2: Every Bounce Pt on Surface Acts a New Virtual Source
Key Point #3: Summation over Sources Picks out Specular Contribution
Key Point #4: Kills Source Statics and no need to know src location or excitation time
Key Point #5: Huge increase in Illumination Area

12. Outline SSP VSP SWP SSP SSP SSP SSP VSP SSP SWP VSP VSP SSP VSP VSP
Output
Data
SSP
VSP
SWP
SSP
SSP
SSP
SSP
VSP
SSP
SWP
VSP
VSP
SSP
VSP
VSP
VSP
SWP
SSP
SWP
SWP
SWP
VSP
SWP
SWP
Input Data