pore pressure from frequency pp-q.ppt · stress path, pore pressure and microstructural influences...
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![Page 1: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/1.jpg)
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1
A new method to calculate
pore pressure
from stacked seismic data
QProtected by US Patent No. 6,681,185
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2
Q stands for Quality Factor
Q is the inverse of attenuation
Q-Based Pore Pressure
What is Q?
![Page 3: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/3.jpg)
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Numerous authors have reported on the experimental
relationship between Qp and Pressure (Peff stress ,Pp) .
Birch and Bancroft
Johnston et al
Lucet and Zinszner
Best and Sams
Carcione
Siggins and Dewhurst
Experimental Results
Such as:
With results like this
1938
1979
1992
1997
2000
2001
![Page 4: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/4.jpg)
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Lab Results
OTC 13043
Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon
Basin Sandstones
A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum, Australia) and P.R. Tingate (National
Centre for Petroleum Geology and Geophysics, University of Adelaide, Australia).
5% Change 150% Change
![Page 5: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/5.jpg)
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An Intuitive Explanation
Q-Based Pore Pressure
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Q-Based Shale Pore Pressure
Hi Q
Frequency
Low Q
Frequency
![Page 7: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/7.jpg)
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Q Responds to Effective Stress
Normal Pressure
Over PressureEffective
stress
Pore
Pressure
Frequency
Hi Q
Frequency
Frequency
Low Q
Frequency
![Page 8: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/8.jpg)
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Procedure
Q-Based Pore Pressure
![Page 9: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/9.jpg)
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Q-Based PP Procedure
Frequency
Decay Pore Pressure
![Page 10: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/10.jpg)
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Deep Water Frequency Trend
![Page 11: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/11.jpg)
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PP-V Calibration
![Page 12: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/12.jpg)
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PP-Q Calibration
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Q-Based Shale PP
Calibrated PP from seismic frequencies
Well B Well A
![Page 14: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/14.jpg)
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Why Use Two Methods to
Calculate PP?
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Q-Based Shale PP
Calibrated PP from seismic frequencies
Well B Well A
![Page 16: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/16.jpg)
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V-Based Shale PP
Calibrated PP from seismic velocities
Well B Well A
![Page 17: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/17.jpg)
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Velocity Responds to LithologyD
epth
DT
Sand Trend
Shale Trend
![Page 18: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/18.jpg)
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Examples
![Page 19: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/19.jpg)
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Water Bottom
Shale
Moderate
Sand/Shale
Ratio
Steep Structure
Causing
Seismic Velocity Issues
![Page 20: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/20.jpg)
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Water Bottom
PP-Q
PP-V
Sandy and Tight
Shaley
Clastics
![Page 21: Pore Pressure from Frequency PP-Q.ppt · Stress Path, Pore Pressure and Microstructural Influences on Q in Carnarvon Basin Sandstones A.F. Siggins and D.N. Dewhurst (CSIRO Petroleum,](https://reader030.vdocument.in/reader030/viewer/2022040115/5e7f81b90c60f14f6a1c878f/html5/thumbnails/21.jpg)
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PP-V PP-Q
Shale
Sandy
Shale
Carbonate
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PP-Q
PP-V
LIFGNow including a lithology influenced frac-gradient, LIFG.
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Using Multiple Pore Pressure Prediction
Techniques provides a way to mitigate
risk.
Conclusion