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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
Chapter from:
(Publication Subject: Seal
Potential and Fault-Migration Rates
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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