Generating realizations of reservoir permeabilty and porosity fields that are conditional to static and dynamic data are difficult. The constraints imposed by dynamic data are typically nonlinear And the relationship between the observed data and the petro- Physical parameters is given by a flow simulator which is expen- Sive to run. In addition, spatial organization of real rock properties Is quite complex. Thus, most attempts at conditioning reservoir Properties to dynamic data have either approximated the relation- Ship between data and parameters so that complex geologic mod- Els could be sued or have used simplified spatial models with Actual production data.
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