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Examining the influence of mechanical stratigraphy and displacement profiles on Previous HitfaultNext Hit linkage and damage zone architecture: an analog study of the Iron Wash Previous HitFaultNext Hit, Utah

David Richey
Utah State University, Department of Geology Logan, Utah, USA
[email protected]

Geologic sequestration of anthropogenic carbon dioxide (CO2) in deep, underground geologic formations, including depleted oil and gas reservoirs or stacked saline aquifers, depends on the ability to adequately store injected CO2 with minimal leakage through natural pathways such as faults and facture networks. The Iron Wash Previous HitFaultNext Hit (IWF), a NW-SE striking, steeply dipping normal Previous HitfaultNext Hit with <100m of displacement in the San Rafael Desert of Utah cuts a range of Mesozoic strata and is an analog for sub-surface faults of similar scale within potential CO2 storage sites and hydrocarbon reservoirs. Potential leakage pathways resulting from Previous HitfaultNext Hit related structures, at both seismic and sub-seismic scales, include fractures, relay zones, synthetic and antithetic faults, Previous HitfaultNext Hit blocks, Previous HitfaultNext Hit splays, Previous HitfaultNext Hit related folds, Previous HitfaultNext Hit gouge and smear. The IWF is characterized using field observations and active source seismic refraction/ reflection imaging to correlate expressions of Previous HitfaultNext Hit architecture in outcrop and in the subsurface to understanding the interaction of Previous HitfaultNext Hit linkage and propagation and their dependence on mechanical stratigraphy. Along-strike heterogeneities such as Previous HitfaultNext Hit growth structures, expressions of the Previous HitfaultNext Hit core and Previous HitfaultNext Hit relay zones at various stages of linkage are characterized with respect to displacement gradients and stratigraphic juxtaposition. Previous HitFaultNext Hit geometry at depth and various expressions of Previous HitfaultNext Hit damage zone related to mechanical stratigraphy provide the basis for the development of theoretical models of Previous HitfaultTop zone properties, including: scale, architecture, connectivity, interaction with lithology, and predictive models of seal effectiveness for fluids in the subsurface.

 

AAPG Search and Discovery Article #90157©2012 AAPG Foundation 2012 Grants-in-Aid Projects