Spectral Analysis Authors: Markham, S.L., Kivior, I., Vaughan, - - PowerPoint PPT Presentation

▶
spectral analysis
SMART_READER_LITE
LIVE PREVIEW

Spectral Analysis Authors: Markham, S.L., Kivior, I., Vaughan, - - PowerPoint PPT Presentation

Sep 06, 2023 195 likes •636 views

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

slide-1
SLIDE 1
slide-2
SLIDE 2

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

slide-3
SLIDE 3

Table of Contents

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

slide-4
SLIDE 4

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

slide-5
SLIDE 5

One layer model: Basement

slide-6
SLIDE 6

Profile view of one layer model

slide-7
SLIDE 7

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

slide-8
SLIDE 8

MWT plots for 50x50m grid

Manual Multi-Window Test

Grid Resolution 50x50m; Source Depth 1km Window Size

Depth [m] 500 1000 1500 10 30 50 70 90

slide-9
SLIDE 9

MWT plot for 50x50m grid, source depth 5km

5000m

slide-10
SLIDE 10

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

slide-11
SLIDE 11

MWT plots for 500x500m grid, source depth 1km

1000m

slide-12
SLIDE 12

MWT plot for 500x500m grid, source depth 5km

5000m

slide-13
SLIDE 13

Two layer model: Sedimentary layer

slide-14
SLIDE 14

Profile view of 2 layer model

slide-15
SLIDE 15

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

1000m 2000m

slide-16
SLIDE 16

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

4000m 5000m

slide-17
SLIDE 17

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

1000m 2000m

slide-18
SLIDE 18

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

4000m 5000m

slide-19
SLIDE 19

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

1000m 2000m

slide-20
SLIDE 20

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

1000m 2000m

slide-21
SLIDE 21

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

4000m 5000m

slide-22
SLIDE 22

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

slide-23
SLIDE 23

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)

slide-24
SLIDE 24

Location of test area

slide-25
SLIDE 25

Location of MWT profile and manual stations

1 2 3 4

slide-26
SLIDE 26

MWT: Auto-ESA (40x40m)

slide-27
SLIDE 27

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

1 2 3 4

slide-28
SLIDE 28

MWT: Example of spectrum at 417000mE (2)

slide-29
SLIDE 29

MWT: Auto-ESA (80x80m)

slide-30
SLIDE 30

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

1 2 3

slide-31
SLIDE 31

MWT: Auto-ESA (160x160m)

slide-32
SLIDE 32

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

1 2 3 4

slide-33
SLIDE 33

MWT: Auto-ESA (400x400m)

slide-34
SLIDE 34

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

1 2 3 4

slide-35
SLIDE 35

Cross-section derived from Seismic data

slide-36
SLIDE 36

Examples of manual MWT at well locations in Middle East

slide-37
SLIDE 37

MWT example at well location 1

slide-38
SLIDE 38

Spectrum example at well location 1

slide-39
SLIDE 39

MWT example at well location 2

slide-40
SLIDE 40

Spectrum example at well location 2

slide-41
SLIDE 41

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

slide-42
SLIDE 42

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.

slide-43
SLIDE 43

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.