The role of mechanical stratigraphy on CO2 migration along faults – examples from Entrada Sandstone, Humbug Flats, Utah, USA

Bleaching patterns along a faulted succession provides new insight into fluid migration pathways controlled by the fault zone and mechanical stratigraphy. In order to investigate this effect, we logged stratigraphic layers in Humbug Flats, Utah, USA both host rocks rocks, where 40 m offset normal cuts through Entrada Sandstone. We measured petrophysical properties using TinyPerm II, Schmidt Hammer laboratory core testing for selected layers. has been identified as proxy parallel bedding, which fades out with distance from faults. A observation is that fracturing of bed interfaces contributes horizontal flow zone. Longer-distance comprehensive bleaching dominates most permeable beds (units), hosting porosity-controlled deformation band associated zones. Fractures prevail low permeability stiffer units, isolated fracture haloes are observed within damage process Strong correlation between permeability/porosity stiffness/strength tested samples different logs. For studied fault, fractures provide important conduits vertical across stiff layers, whereas more porous bedding-parallel paths