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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
fault
and cap rock seals
DOI:10.1306/1060762H23167
2005 by The American Association of Petroleum Geologists.
Using Buoyancy Pressure Profiles to Assess Uncertainty in
Fault
Seal Calibration
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Peter Bretan, Graham Yielding
Badley Geoscience Limited, Lincolnshire, United Kingdom
ACKNOWLEDGMENTS
The authors are grateful to Rob Weeden, Peter Boult, and an anonymous reviewer for their thoughtful and constructive comments.
ABSTRACT
Effective fault
seal model calibration is dependent on the quality of the available data. Buoyancy pressure profiles provide a method to assess the potential uncertainty involved in deriving key input data, such as Vclay (volumetric clay fraction), and in the empirical equations used to derive seal-failure criteria. For a membrane-sealing
fault
, seal failure occurs when the buoyancy pressure exerted by the hydrocarbon column is equal to the minimum capillary entry pressure of the
fault
zone. If the seal is intact, the predicted
fault
zone capillary entry pressure value must be higher than the buoyancy pressure and, on a buoyancy pressure profile, plot to the right of the buoyancy pressure trend line. Predicted values that are lower than the buoyancy pressure indicate either that the
fault
is leaking or that one or more of the input data are in error.
Buoyancy pressure profiles are used postmortem to identify which data analysis techniques and seal-failure criteria best predict the observed hydrocarbon contacts in a given area. They can also be used to verify the threshold shale gouge ratio values that represent the onset of fault
sealing.
The effect of varying key input parameters can be rapidly checked using buoyancy pressure profiles without resorting to more time-consuming probabilistic approaches. The analysis can identify which data preparation techniques provide appropriate estimates of the fault
zone capillary entry pressure, relative to the observed buoyancy pressure, thereby significantly reducing potential uncertainty in the
fault
seal calibration.
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