The result will be an excellent approximation of the high-resolution calculations performed in the original model within the simulation model, more accurate predictions of reservoir behaviour and fl uid fl ow, and ultimately improved fi eld performance. The Challenge of Upscaling Geologists today often generate highly heterogeneous descriptions of reservoirs, describing complex structures in considerable detail to build the geological model. The result is that the detailed reservoir models tend to contain too many grid cells which must be reduced through upscaling due to the limitation of computing hardware in rela- tion to computing speed and time required to carry out the reservoir simulation. Many detailed reservoir models, however, contain too many grid cells for effective res

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