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Abstract: The Spatial Distribution of Previous HitFaultNext Hit-Related Diagenesis Around the Moab Previous HitFaultNext Hit, Utah

GARDEN, ROSS, BG Research & Technology; ANDREW FOXFORD, Castle Farm; SIMON GUSCOTT, Amerada Hess Ltd.; STUART BURLEY, BG Research & Technology; JOHN WALSH, Previous HitFaultNext Hit Analysis Group, Liverpool & JUAN WATTERSON, Previous HitFaultNext Hit Analysis Group, Liverpool

Previous HitFaultNext Hit-related diagenesis along the Moab Previous HitFaultNext Hit, Utah takes the form of calcite veining and copper mineralization within the Previous HitfaultNext Hit zone. and calcite cementation and into reduction of wallrocks. Calcite cementation is concentrated within 250m of the Previous HitfaultNext Hit zone, whereas reduction is preferentially developed adjacent to the Previous HitfaultNext Hit and extends >7km from the Previous HitfaultNext Hit in high permeability, well connected sandstones. The diagenesis is volumetrically most significant at structurally complex sites along the Previous HitfaultNext Hit trace, such as branch-points and Previous HitfaultNext Hit bends and occurred over a relatively short time period of <10 Ma during the early Tertiary subsequent to major Previous HitfaultNext Hit displacement. Calcite cementation and iron reduction are attributed to migration of aqueous and hydrocarbon fluids, respectively. These fluids utilized the Previous HitfaultNext Hit and associated fracture system as a vertical flow conduit from deeper sources into high permeability Jurassic sandstones juxtaposed against the Previous HitfaultNext Hit. The presence of hydrofracture-hosted vein networks that cross-cut the Moab Previous HitFaultNext Hit indicate that the fluids were overpressured and that fluid migration resulted from a short-lived episode of Previous HitfaultNext Hit valving.

The concentrations of enhanced diagenesis at specific sites demonstrates the focusing of fluid flow along the Previous HitfaultNext Hit. The location of such sites is due not only to the fracture permeability associated with the structural complexity but also to the fact that these sites are characterised by Previous HitfaultTop-bounded structural highs through which fluid migration was concentrated.

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