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Oil Injecting hot steam into the reservoir is the most efficient method for producing heavy oil in the Alberta. For simulating this process, and predicting amount of produced and injected steam, STARS software which is very expensive can be used. Simulation running time is another concern for petroleum engineers. Just for simulating this mechanism in a well pair, running time is about 10 hours. As a result, running time of a full model is about one week. For this reason, in the department of mining and petroleum engineering, a proxy for fast and accurate simulating of this process has been developed. Running time using this proxy is less than 1 minute which is very fast. But correlation coefficient between simulator and proxy results should be reasonably high, otherwise finding an inaccurate result is not acceptable. Usually correlation coefficient of 0.9 or higher is great. This proxy can be used for realization ranking application. After Geostatistical modeling of realizations, they should be ranked based on the highest oil production and lowest steam injection for transferring uncertainty of reservoir to the simulation models. There are four different parameters in the proxy which are uncertain. All other parameters are fixed. These parameters are number of discretized cells in the horizontal direction (n), steam pressure (P), steam temperature (T) and Enthalpy multiplier (H). Two levels have been considered for each factor. 100 reservoir realizations have been generated for this sensitivity analysis. Then these realizations have been tested with simulator. After that, they have been tested by proxy using different level of parameters. For each case, realizations …