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An Ensemble Level Upscaling Approach for Efficient Estimation of Fine-Scale Production Statistics Using Coarse-Scale Simulations Yuguang Chen， SPE， Chevron Energy Technology Co.， and Louis J. Durlofsky， SPE， Stanford U. Copyright 2007， S... An Ensemble Level Upscaling Approach for Efficient Estimation of Fine-Scale Production Statistics Using Coarse-Scale Simulations Yuguang Chen， SPE， Chevron Energy Technology Co.， and Louis J. Durlofsky， SPE， Stanford U. Copyright 2007， Society of Petroleum Engineers This paper was prepared for presentation at the 2007 SPE Reservoir Simulation Symposium held in Houston， Texas， U.S.A.， 26–28 February 2007. This paper was selected for presentation by an SPE Program Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper， as presented， have not been reviewed by the Society of Petroleum Engineers and are subject to correction by the author(s). The material， as presented， does not necessarily reflect any position of the Society of Petroleum Engineers， its officers， or members. Papers presented at SPE meetings are subject to publication review by Editorial Committees of the Society of Petroleum Engineers. Electronic reproduction， distribution， or storage of any part of this paper for commercial purposes without the written consent of the Society of Petroleum Engineers is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of where and by whom the paper was presented. Write Librarian， SPE， P.O