1 / 43

Testing survey resolution using Spectral Analysis Authors: Markham, S.L., Kivior, I., Vaughan, F.V., Yates, S. and Barn

Testing survey resolution using Spectral Analysis Authors: Markham, S.L., Kivior, I., Vaughan, F.V., Yates, S. and Barnden S. EAGE Workshop on The Future of Non-Seismic Methods 12-15 October 2008, Manama, Bahrain. Table of Contents. Introduction Theoretical Models: One layer

mimi
Download Presentation

Testing survey resolution using Spectral Analysis Authors: Markham, S.L., Kivior, I., Vaughan, F.V., Yates, S. and Barn

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Testing survey resolution using Spectral Analysis Authors: Markham, S.L., Kivior, I., Vaughan, F.V., Yates, S. and Barnden S. EAGE Workshop on The Future of Non-Seismic Methods 12-15 October 2008, Manama, Bahrain

  2. Table of Contents Introduction Theoretical Models: One layer Two layer Case Study: Central San Luis Basin MWT examples Conclusions

  3. Theoretical Models: One and Two Layers One Layer; 50x50m, 100x100m and 500x500m grid spacing Two Layers; 100x100m, 200x200m and 500x500m grid spacing

  4. One layer model: Basement

  5. Profile view of one layer model

  6. Simple one layer model: Basement at 1km and 5km

  7. MWT plots for 50x50m grid Manual Multi-Window Test Grid Resolution 50x50m; Source Depth 1km 0 50 10 30 70 90 500 Depth [m] 1000 Window Size 1500

  8. MWT plot for 50x50m grid, source depth 5km 5000m

  9. Simple one layer model: Basement at 1km and 5km

  10. MWT plots for 500x500m grid, source depth 1km 1000m

  11. MWT plot for 500x500m grid, source depth 5km 5000m

  12. Two layer model: Sedimentary layer

  13. Profile view of 2 layer model

  14. Two layer model: 100x100m grid, source depths 1 & 2km 1000m 2000m

  15. Two layer model: 100x100m grid, source depths 4 & 5km 4000m 5000m

  16. Two layer model: 200x200m grid, source depths 1 & 2km 1000m 2000m

  17. Two layer model: 200x200m grid, source depths 4 & 5km 4000m 5000m

  18. Two layer model: 500x500m grid, source depths 1 & 2km 1000m 2000m

  19. Two layer model: 500x500m grid, source depths 1 & 2km 1000m 2000m

  20. Two layer model: 500x500m grid, source depths 4 & 5km 4000m 5000m

  21. Case study using survey acquired on behalf of USGS in Central San Luis Basin, Colorado, U.S.A.

  22. Central San Luis Basin survey (USGS) Examples using the 200m line spacing dataset (40x40m grid) Traverse lines removed to simulate; 400m line spacing (80x80m grid) 800m line spacing(160x160m grid) 2000m line spacing(400x400m grid)

  23. Location of test area

  24. Location of MWT profile and manual stations 1 2 3 4

  25. MWT: Auto-ESA (40x40m)

  26. MWT: Depth vs. Window Size at 4 points along profile (40x40m) 2 1 3 4

  27. MWT: Example of spectrum at 417000mE (2)

  28. MWT: Auto-ESA (80x80m)

  29. MWT: Depth vs. Window Size at 4 points along profile (80x80m) 1 2 4 3

  30. MWT: Auto-ESA (160x160m)

  31. MWT: Depth vs. Window Size at 4 points along profile (160x160m) 1 2 4 3

  32. MWT: Auto-ESA (400x400m)

  33. MWT: Depth vs. Window Size at 4 points along profile (400x400m) 1 2 3 4

  34. Cross-section derived from Seismic data

  35. Examples of manual MWT at well locations in Middle East

  36. MWT example at well location 1

  37. Spectrum example at well location 1

  38. MWT example at well location 2

  39. Spectrum example at well location 2

  40. Conclusions The resolution of the survey data has significant impact on ability to accurately define depths using spectral analysis High resolution surveys with line spacings of 200 and 400m are needed to image subtle intersedimentary horizons Widely spaced surveys of 1600 and 2000m are unlikely to resolve shallow features

  41. References Bankey, V., Grauch, V., J., S., Webbers, A., and PRJ, Inc. (2005). Open File Report 2005-1200, USGS Kivior, I., Boyd, D., Shi, Z. and McClay, K., R., 1993, Exploration Geophysics, 24, 603-608. Spector, A. and Grant, F., 1970, Geophysics, 35, 293-302. Yates, S., Kivior, I., Damte, S., Markham, S., L. and Vaughan, F., 2008, in press.

  42. Acknowledgements The data used for this study was made available for research purposes by the USGS. The data used for this study was made available for research purposes by the USGS.

More Related