1. Wavelet Extraction using Seismic Interferometry C. Boonyasiriwat and S. Dong November 15, 2007

2. Outline Theory Theory Numerical Results Numerical Results Synthetic Data Test Synthetic Data Test 10-Layer Model 10-Layer Model Model with Mapleton Topography Model with Mapleton Topography Field Data Test Field Data Test Mapleton Data Mapleton Data Conclusion Conclusion Future Work Future Work Field Data Test on North Sea Data Field Data Test on North Sea Data VSP -> VSP Case VSP -> VSP Case Statics Estimation for SSP -> SSP Case Statics Estimation for SSP -> SSP Case

3. Theory SSP-to-SSP Transform SSP-to-SSP Transform XAB

4. Theory XAB

5. Theory XAB

6. Theory XAB

7. Theory XAB

8. Theory Virtual CSG Virtual CSG Real CSG Real CSG Extracted Wavelet Extracted Wavelet

9. Numerical Results Synthetic Data Test Synthetic Data Test 10-Layer Model 10-Layer Model Model with Mapleton Topography Model with Mapleton Topography Field Data Test Field Data Test Mapleton Data Mapleton Data

10. 10-Layer Model

11. Original CSG vs. Virtual CSG

12. True Source vs. Extracted Source

13. Model with Mapleton Topography

14. Original CSG vs. Virtual CSG

15. True Source vs. Extracted Source

16. Mapleton Data Surface wave has relatively lower frequency than the P-wave signal. Surface wave has relatively lower frequency than the P-wave signal. The extracted wavelet has low peak frequency and narrower bandwidth compared to those of the data. The extracted wavelet has low peak frequency and narrower bandwidth compared to those of the data. The strong surface wave affected the extracted wavelet. The strong surface wave affected the extracted wavelet.

17. Conclusion Seismic interferometry (SSP -> SSP case) can be utilized to extract a source signature from a data set itself without velocity information. Seismic interferometry (SSP -> SSP case) can be utilized to extract a source signature from a data set itself without velocity information. Further test will be done on the North Sea data. Further test will be done on the North Sea data.

18. Future Work Wavelet extraction in VSP -> VSP case. Wavelet extraction in VSP -> VSP case. Statics estimation using SSP -> SSP transform. Statics estimation using SSP -> SSP transform.