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Post-depositional normal faults within the turbidite sequence of the Late Miocene Mount Messenger Formation of the Taranaki Basin, New Zealand are characterized by granulation and cataclasis of sands and by the smearing of clay beds. Clay smears maintain continuity for high ratios of fault throw to clay source bed thickness (c. 8), but are highly variable in thickness, and gaps occur at any point between the clay source bed cut-offs at higher ratios. Although cataclastic fault rock permeabilities may be appreciably lower (c. two orders of magnitude) than host rock sandstone permeabilities, the occurrence of continuous clay smears, combined with low clay per- meabilities (10s to 100s nD) means that the primary control on fault rock permeability is clay smear continuity. A new permeability predictor, the Probabilistic Shale Smear Factor (PSSF), is developed which incorporates the main characteristics of clay smearing from the Taranaki Basin. The PSSF method calculates fault permeabilities from a simple model of multiple clay smears within fault zones, predicting a more heterogeneous and realistic fault rock structure than other approaches (e.g. Shale Gouge Ratio, SGR). Nevertheless, its averaging effects at higher ratios of fault throw to bed thickness provide a rationale for the application of other fault rock mixing models, e.g. SGR, at appropriate scales. A large number of parameters are required to define a model of a fault system for the purposes of exam- ining the flow response of a faulted siliciclastic reservoir. These parameters can be divided into those which define the geometrical scaling proper- ties of the fault system and those which define the flow properties of the faults. Fault properties are generally included in reservoir simulators as trans- missibility multipliers which modify the potential for flow from one side of a fault to the other (Manzocchi et al. 1999). The calculation of geolo- gically meaningful fault transmissibility multipliers requires predictors of both fault rock thickness and permeability. Fault rock thickness can usually be predicted from the well established positive corre- lation with fault displacement. Definition of a fault rock permeability predictor is a much more difficult task due to the strongly heterogeneous and anisotropic nature of fault rocks. Permeability

Definition of a fault permeability predictor from outcrop studies of a faulted turbidite sequence, Taranaki, New Zealand