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.

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Presentation transcript:

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 October 2008, Manama, Bahrain

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

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

One layer model: Basement

Profile view of one layer model

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

MWT plots for 50x50m grid Manual Multi-Window Test Grid Resolution 50x50m; Source Depth 1km Window Size Depth [m]

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

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

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

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

Two layer model: Sedimentary layer

Profile view of 2 layer model

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

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

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

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

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

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

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

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

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)

Location of test area

Location of MWT profile and manual stations 1234

MWT: Auto-ESA (40x40m)

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

MWT: Example of spectrum at mE (2)

MWT: Auto-ESA (80x80m)

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

MWT: Auto-ESA (160x160m)

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

MWT: Auto-ESA (400x400m)

MWT: Depth vs. Window Size at 4 points along profile (400x400m) 12 34

Cross-section derived from Seismic data

Examples of manual MWT at well locations in Middle East

MWT example at well location 1

Spectrum example at well location 1

MWT example at well location 2

Spectrum example at well location 2

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

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

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