This paper presents the results of the 10th SPE Comparative Solution Projec
t on Upscaling. Two problems were chosen. The first problem was a small 2D
gas-injection problem, chosen so that the fine grid could be computed easil
y and both upscaling and pseudoization methods could be used. The second pr
oblem was a waterflood of a large geostatistical model, chosen so that it w
as hard (though not impossible) to compute the true fine-grid solution Nine
participants provided results for one or both problems.