The non-specialist is introduced to the uses made of numerical simulation in modelling the behaviour and performance of hydrocarbon reservoirs. Hydrocarbon reservoir modelling can be compared with groundwater modelling, but is generally more complex, commonly dealing with multiphase fluid systems in two or three dimensions. Both finite difference and finite element techniques are used to solve numerically the equations of motion. The application of two powerful models, PORES and PROGRESS, illustrates the use of simulation during the various stages of development of the Morecambe and Rough gas fields by British Gas.

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