This study quantified the contribution of a damage zone for a range of observed host rock and damage zone characteristics, such as: reservoir Vshale; fault shale-gouge ratio (SGR); damage intensity; and permeability of reservoir, fault, and deformation bands. A hypothetical reservoir was utilized to show the impact of a damage zone on the overall FTM calculation. The relative impact of a damage zone on the total cross-fault flow was calculated empirically relative to the percentage of reservoir offset. Single variables were modified in each calculation to isolate the greatest controls on damage zone impact. The calculations were made for a single hypothetical reservoir unit, surrounded by shale above and below. Fault permeabilities were calculated using equations similar to those in Manzocchi et al. (1999). Effective permeabilities were calculated using a harmonic mean. The difference between cross-fault FTM from only the fault core versus the fault core acting with a damage zone was calculated, and used to assemble risking tables to be assessed for a range of Vshale and percentage of reservoir offset. The difference represents the correction factor to be applied to the currently calculated fault transmissibility multiplier (FTM).


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