Subwavelength Imaging using Seismic Scanning Tunneling Macroscope Field Data Example

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

Depth

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

Scattererr

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

+𝐿 1¿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 Lo

catio

n

R

15 m

𝝀𝟐

𝝀𝟖

R With scatterersWithout scatterers

Migration Images

Trial Source Location

Act

ual S

ourc

e Lo

catio

n

R

𝝀𝟐𝝀𝟏𝟎

R With scatterersWithout scatterers

Migration Image for the weaker scatterer

R

𝝀𝟐

𝝀𝟏𝟎

Trial Source Location

Act

ual S

ourc

e Lo

catio

n

R With scatterersWithout 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 !!!