This paper describes two case studies which illustrate the development and practical application of multi-variable permeability transforms in reservoir simulation studies. The complex lithologies of the two reservoirs under study and the apparent lack of adequate correlations between porosity and permeability necessitated the use of multi-variable transforms. The described methods proved instrumental in the permeability characterization of the reservoirs and in the construction and history-matching of the respective simulation models. In essence, the methods were based on the integration of reservoir information from well logs and cores, subsequently calibrated against well tests.

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