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- W2000327002 abstract "Summary This work discusses an automatic history-matching procedure to efficiently condition the location and geometry of a stochastic channel to well-test pressure data. Our emphasis is on computational difficulties that are related to the nonlinearity of the objective function, or arise from the definition of effective permeability on a reservoir simulation gridblock that is intersected by one or more channel boundaries. We show that upscaling gridblock permeabilities for gridblocks intersected by channel boundaries introduces spurious local minima in the objective function that must be optimized to obtain a realization of the model. We show that an automatic history-matching procedure can be used to define upscaled permeabilities. When the permeability contrasts across facies boundaries are extreme, however, the resulting properties may be influenced by the difference in local truncation errors between the fine- and coarse-grid systems. Moreover, the upscaled permeabilities obtained by history matching depend on the flow regimes reflected in the pressure data history matched. The problems we observed are not specific to channels but will occur whenever boundaries of facies with large contrasts are estimated by history matching. One important objective of this work is to provide computational insight for the general problem of conditioning a reservoir facies model to production data by automatic history matching." @default.
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- W2000327002 date "2003-03-01" @default.
- W2000327002 modified "2023-09-28" @default.
- W2000327002 title "The Impact of Upscaling Errors on Conditioning a Stochastic Channel to Pressure Data" @default.
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- W2000327002 doi "https://doi.org/10.2118/83679-pa" @default.
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