subwavelength imaging using seismic scanning tunneling macroscope field data example g. dutta, a....
TRANSCRIPT
Subwavelength Imaging using Seismic Scanning Tunneling Macroscope
Field Data Example
G. Dutta, A. AlTheyab, S. Hanafy, G. Schuster
King Abdullah University of Science and Technology, Saudi Arabia
September 19, 2012
Outline
• Motivation
• Background
• Theory
• Kaust Field Experiment
• Qademah Field Experiment
• Conclusions
Outline
• Motivation
• Background
• Theory
• Kaust Field Experiment
• Qademah Field Experiment
• Conclusions
0 km 7 km
0 km
3 km
Why is Resolution Important ?
?
KM image0 km 7 km
Least Squares KM image
Outline
• Motivation
• Background
• Theory
• KAUST Field Experiment
• Qademah Field Experiment
• Conclusions
Background
Dep
th
Δx
Z
• Rayleigh Resolution
• Abbe Resolution
Can we achieve ??? • De Fornel (2001) and Jia et al. (2010) got super-resolution in
optical imaging.with evanescent waves.
• Schuster et al. (2012) used SSTM to get super-resolution with numerical experiments.
Outline
• Motivation
• Background
• Theory
• Kaust Field Experiment
• Qademah Field Experiment
• Conclusions
Seismic Scanning Tunneling MacroscopeSources
Receivers
Scatterer
r
Post-stack migration image (Schuster et al. 2012):
𝑚 (𝑠′ ,𝑠0 )=𝛼 sin ¿¿
𝑠 ′
𝑠0
𝑔
Seismic Scanning Tunneling Macroscope
r
𝑠 ′
𝑠0
𝑔
Post-stack migration image:
0.2 0.7`
0.2 0.7
𝑐
|𝑠−𝑠0|∨𝑠 ′ −𝑠0∨¿∫−𝐿
+𝐿1
¿𝑔−𝑠0❑∨¿2 ¿¿
0.2 0.7S’
Near field resolution Far field resolution
Outline
• Motivation
• Background
• Theory
• KAUST Field Experiment
• Qademah Field Experiment
• Conclusions
Sources
Line 1
Line 5
Line 4
Line 3
Line 2
Layout of the Field Experiment
Scatterer near shot 12
Layout of the Field Experiment
Common Shot Gathers
a) CSGs before putting any scatterer b) CSGs after burying a scatterer
Migration Images
R R
Without Scatterers With Scatterers
Resolution at full bandwidth of the data
1.2 m
0.6 m
Resolution at half bandwidth of the data
0.6 m
Outline
• Motivation
• Background
• Theory
• KAUST Field Experiment
• Qademah Field Experiment
• Conclusions
Qademah Field Experiment with no scatterer
Qademah Field Experiment with one scatterer
Qademah Field Experiment with two scatterers
Migration Images
Trial Source Location
Act
ual S
ourc
e L
ocat
ion
R
15 m
𝝀𝟐
𝝀𝟖
R With scatterersWithout scatterers
Migration Images
Trial Source Location
Act
ual S
ourc
e L
ocat
ion
R
𝝀𝟐
𝝀𝟏𝟎
R With scatterersWithout scatterers
Migration Image for the weaker scatterer
R
𝝀𝟐
𝝀𝟏𝟎
Trial Source Location
Act
ual S
ourc
e L
ocat
ion
R With scatterers
Without scatterers
Outline
• Motivation
• Background
• Theory
• KAUST Field Experiment
• Qademah Field Experiment
• Conclusions
Conclusions
• Scatterers can be imaged with subwavelength resolution with SSTM.
• Field data results show a super-resolution signature of .
• Direct arrivals, surface waves and ground roll need to removed during preprocessing.
Acknowledgements
We would like to thank
• King Abdullah University of Science and Technology
• Society of Exploration Geophysicists
• Chamber of Geophysical Engineers of Turkey
THANK YOU !!!