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. Shallow-level igneous intrusions are a common feature ofmany sedimentary basins, and there is increased recognition of thesyn-emplacement deformation structures in the host rock that help toaccommodate this magma addition. However, the sub-seismic structure andreservoir-scale implications of igneous intrusions remain poorly understood.The Trachyte Mesa intrusion is a small (∼1.5 km2),NE–SW trending satellite intrusion to the Oligocene-age Mount Hillersintrusive complex in the Henry Mountains, Utah. It is emplaced within thehighly porous, aeolian Entrada Sandstone Formation (Jurassic), producing anetwork of conjugate sets of NE–SW striking deformation bands trendingparallel to the intrusion margins. The network was characterized by defininga series of nodes and branches, from which the topology, frequency,intensity, spacing, characteristic length, and dimensionless intensity ofthe deformation band traces and branches were determined. These quantitativegeometric and topological measures were supplemented by petrological,porosity and microstructural analyses. Results show a marked increase indeformation band intensity and significant porosity reduction withincreasing proximity to the intrusion. The deformation bands are likely toimpede fluid flow, forming barriers and baffles within the Entrada reservoirunit. A corresponding increase in Y- and X-nodes highlights the significantincrease in deformation band connectivity, which in turn will significantlyreduce the permeability of the sandstone. This study indicates that fluidflow in deformed host rocks around igneous bodies may vary significantlyfrom that in the undeformed host rock. A better understanding of thevariability of deformation structures, and their association with intrusiongeometry, will have important implications for industries where fluid flowwithin naturally fractured reservoirs adds value (e.g. hydrocarbon reservoirdeliverability, hydrology, geothermal energy and carbon sequestration).

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Analysis of deformation bands associated with the Trachyte Mesa intrusion, Henry Mountains, Utah: implications for reservoir connectivity and fluid flow around sill intrusions