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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
Chapter from:
(Publication Subject:
Chapter 7
Microstructures and Diagenesis in North Sea Fault Zones: Implications for Fault-Seal Potential and Fault-Migration Rates
by
S.J. Hippler1
Exxon Production Research Company Houston, Texas, U.S.A.
1Now with Exxon Exploration Company, Houston, Texas
ABSTRACT
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In the northern North Sea, faulting of weakly lithified sand and shale units was
accomplished via independent particulate flow, in which grains are disaggregated and
reoriented without grain fracture. In the southern North Sea, faulting of lithified
sandstone units was dominated by grain fracture and grain size reduction. Capillary
pressure measurements of the deformed samples indicate that both independent particulate
flow and cataclastic deformation mechanisms
result in relatively low permeability fault
zones in comparison to the surrounding
reservoir
rocks. Cements are commonly observed
within the North Sea fault zones and also contribute to the permeability reduction. Simple
calculations using the fluid-flow measurements suggest, however, that faults with good
sealing potential can allow hydrocarbon migration over geologic time scales.
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