TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThis work presents the use of pseudoisation to account for faults using practical representations of the multiphase behaviour of fault rocks within production simulation models The work starts by revisiting the conventional representation of fault sealing capacities in simulation models using transmissibility multipliers (TMs). TMs, as proposed by Manzocchi et al. (1999) are absolute and phase-independent values that are used to take into account the presence of faultrocks within production simulation models and are calculated based on the fault thickness and absolute permeability, as well as the size and properties of the undeformed grid-blocks adjacent to faults. The crucial limitation of TMs is that they do not take into account the multiphase behaviour of fault rocks, whose relative-permeability and capillary-pressure curves can have very different characteristics to their juxtaposed hostrock curves. This paper presents and tests a practical representation of the multiphase behaviour of fault rocks within production simulation models using in-situ-generated pseudofunctions. The generated dynamic pseudofunction curves are attached to the upstream cells of the faults using an analogous method to that proposed by Manzocchi et al. (2002). This method takes into account in-situ fractional flows and compartmentalised phase pressures across fault faces between non-neighbour connections. The proposed method gives very promising results when applied to a 3-D, two-phase model with faultrock thicknesses ranging between 0.5 and 3 ft, and typical fault rock permeabilities (0.1-0.01) mD
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