--> Abstract: Fault Zone Architecture and Fluid Flow Anisotropy in Heterolithic Reservoirs, by J. S. Caine and C. B. Forster; #90937 (1998)
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Abstract: Previous HitFaultNext Hit Zone Architecture and Fluid Flow Anisotropy in Heterolithic Reservoirs

CAINE, JONATHAN SAUL, and CRAIG B. FORSTER, University of Utah, Dept. of Geology and Geophysics

Previous HitFaultNext Hit zones can control fluid flow in petroleum reservoirs by acting as seals, conduits, or combined conduit-seal systems. Evaluating their fluid flow properties, however, requires a sound understanding of the episodic mechanical and geochemical processes that control the evolution of Previous HitfaultNext Hit zone architecture through geologic time. Integrated outcrop studies and laboratory analyses of Previous HitFaultNext Hit 6, east Greenland, reveal several key controls on the permeability structure of normal faults found in heterolithic reservoirs. Previous HitFaultNext Hit 6 is one of a system of normal faults which form an onshore analog for Previous HitfaultNext Hit compartmentalized Upper Carboniferous through Lower Cretaceous sandstones and shales. It displays 65 m of displacement and comprises two components: a Previous HitfaultNext Hit core and a damage zone (whose intensity decreases with distance from the Previous HitfaultNext Hit core).

The heterogeneous lithology (clay-rich gouge and silicified breccia) of the Previous HitfaultNext Hit core reflects the way that the protolith is assimilated into, and modified within, the Previous HitfaultNext Hit zone to create a low-permeability seal. The damaged zone comprises a network of subsidiary structure., (e.g., small faults, fractures, veins, and folds) that yield a region of enhanced permeability surrounding the Previous HitfaultNext Hit core. The combination of both high and low permeability rocks within the Previous HitfaultNext Hit zone produces a complex conduit-seal system that restricts fluid flow across the Previous HitfaultNext Hit while providing anisotropic pathways for flow along the Previous HitfaultNext Hit. Where such faults can be identified in producing reservoirs they might be represented in reservoir simulations as distinct features with an anisotropic permeability structure that varies along the Previous HitfaultTop.

AAPG Search and Discovery Article #90937©1998 AAPG Annual Convention and Exhibition, Salt Lake City, Utah