testing survey resolution using spectral analysis authors: markham, s.l., kivior, i., vaughan, f.v.,...
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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 Methods12-15 October 2008, Manama, Bahrain
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Table of Contents
Introduction
Theoretical Models:
One layer
Two layer
Case Study:
Central San Luis Basin
MWT examples
Conclusions
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Theoretical Models: One and Two Layers
One Layer; 50x50m, 100x100m and 500x500m
grid spacing
Two Layers; 100x100m, 200x200m and
500x500m grid spacing
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One layer model: Basement
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Profile view of one layer model
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Simple one layer model: Basement at 1km and 5km
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MWT plots for 50x50m gridManual Multi-Window TestGrid Resolution 50x50m; Source Depth 1km
Window Size
Dep
th [m
]
500
1000
1500
10 30 50 70 90 0
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MWT plot for 50x50m grid, source depth 5km
5000m
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Simple one layer model: Basement at 1km and 5km
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MWT plots for 500x500m grid, source depth 1km
1000m
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MWT plot for 500x500m grid, source depth 5km
5000m
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Two layer model: Sedimentary layer
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Profile view of 2 layer model
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Two layer model: 100x100m grid, source depths 1 & 2km
1000m
2000m
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Two layer model: 100x100m grid, source depths 4 & 5km
4000m
5000m
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Two layer model: 200x200m grid, source depths 1 & 2km
1000m
2000m
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Two layer model: 200x200m grid, source depths 4 & 5km
4000m
5000m
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Two layer model: 500x500m grid, source depths 1 & 2km
1000m
2000m
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Two layer model: 500x500m grid, source depths 1 & 2km
1000m
2000m
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Two layer model: 500x500m grid, source depths 4 & 5km
4000m
5000m
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Case study using survey acquired on behalf of USGS in Central San Luis Basin, Colorado,
U.S.A.
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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)
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Location of test area
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Location of MWT profile and manual stations
1 2 3 4
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MWT: Auto-ESA (40x40m)
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MWT: Depth vs. Window Size at 4 points along profile (40x40m)
1 2
3 4
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MWT: Example of spectrum at 417000mE (2)
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MWT: Auto-ESA (80x80m)
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MWT: Depth vs. Window Size at 4 points along profile (80x80m)
1 2
3 4
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MWT: Auto-ESA (160x160m)
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MWT: Depth vs. Window Size at 4 points along profile (160x160m)
1 2
3 4
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MWT: Auto-ESA (400x400m)
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MWT: Depth vs. Window Size at 4 points along profile (400x400m)
1 2
3 4
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Cross-section derived from Seismic data
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Examples of manual MWT at well locations in Middle East
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MWT example at well location 1
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Spectrum example at well location 1
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MWT example at well location 2
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Spectrum example at well location 2
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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
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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.
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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.