Shale and carbonate semented barriers in petroleum reservoirs are of major concern due to its influence on flow characteristics. A stochastic model for shale distribution in a sandstone reservoir is established. A Markov field model combined with marked point processes are applied. Based on the model and constrained by the observations in wells, several realizations of the reservoir description are generated. The description is homogenized and transfered to a format suitable as input to ECLIPSE. Reservoir production simulations are performed on the realizations, hence the uncertainty in the production profiles can be evaluated.


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