Key words: multilayered reservoirs, static and simulation models, numerical cells, material balance, Carter-Tracy model, interbed leakage.
Numerical reservoir simulation is always a compromise between accuracy of geological description and calculation rate. Development of optimal 3D field model, in terms of number and size of cells, requires adequate recognition of the field’s geological and technological features. The paper introduces the method of decreasing the number of cells in a model. This algorithm was applied for Sudanese G oil field simulation. It includes common upscaling procedure and split of the model into parts based on geological characteristics and development technology. Simplified material balance model is built for each reservoir, inter reservoirs transmissibility and aquifer power are evaluated as a result of reservoir pressure matching. Division of the initial 3D model is performed according to simplified models with predetermined on Material balance models aquifer flux and interbed leakage.
