In recent years, stochastic modeling technique has become a hot topic in reservoir characterization. Wherease, what should be made clear, if the technique is used in constructing geological models in early evaluationphase, is what problems in oil-gas development study can be solved by this technique. In this paper, focusing on the early evaluation phase of reservoir, the application cases from two reservoirs are used to discuss what practical problems can be solved by sectional reservoir models, which were built up by means of this technique.

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