--> --> Abstract: Effect of Hydrodynamics and Fault Zone Heterogeneity from Membrane Seal Capacity, by Julian Strand, Jim Underschultz, Karsten Michael, Brett Freeman, and Graham Yielding; #90082 (2008)
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Effect of Hydrodynamics and Previous HitFaultNext Hit Zone Heterogeneity from Membrane Seal Capacity

Julian Strand1, Jim Underschultz1, Karsten Michael1, Brett Freeman2, and Graham Yielding2
1Petroleum Resources, CSIRO, Bentley, WA, Australia
2Badleys Geosciences Ltd, Spilsby, United Kingdom

The use of Shale-Gouge-Ratio (SGR) methods to predict across-Previous HitfaultNext Hit seal capacity relies on a calibration of the methodology against field examples. Existing calibrations have plotted across-Previous HitfaultNext Hit pressure difference or buoyancy pressure against in situ SGR to define a Previous HitfaultNext Hit-seal failure envelope. Recent work on hydrodynamics and seal capacity has provided insight on fine-tuning the calibration methodologies that should in turn lead to improved Previous HitfaultNext Hit seal capacity predictions. A situation not fully addressed, however, is the impact of Previous HitfaultNext Hit zone heterogeneity on the hydrodynamic characteristics of a Previous HitfaultNext Hit and thus the membrane seal capacity.

For a Previous HitfaultNext Hit that defines a hydraulic head discontinuity at the reservoir scale, there exists a hydraulic head gradient or distribution within the Previous HitfaultNext Hit-zone that is determined by the detailed permeability distribution within the Previous HitfaultNext Hit zone. As a result, the capillary threshold pressure varies across the Previous HitfaultNext Hit. When compared with the hydraulic head, the Previous HitfaultNext Hit zone seal capacity can be estimated at various locations within the Previous HitfaultNext Hit zone. Theoretical examination of membrane seal capacity for various permeability distributions can be used to understand parameters that control the location of the critical leak point for a membrane Previous HitfaultNext Hit seal. This can also be extended to examine possible up-Previous HitfaultNext Hit leakage.

A range of permeability distributions are examined for a theoretical Previous HitfaultNext Hit zone. Assuming a given across Previous HitfaultNext Hit pressure difference in the aquifer, the internal Previous HitfaultTop zone seal capacity is determined to demonstrate the various controls on a faults critical leak point.

AAPG International Conference and Exhibition, Cape Town, South Africa 2008 © AAPG Search and Discovery