This paper describes a new material balance calculation by coupling a statistics based history matching program with a material balance program. The procedure is to match the historical reservoir pressure data with the calculated pressures obtained from the material balance program – the so-called pressure match method – with the help of the history matching program.

The combination of the history matching and material balance programs proves to be a very simple and powerful tool for material balance calculations. A user who does not know different material balance methods under various reservoir conditions is able to calculate the material balance with great accuracy. This is because the new procedure is based on the pressure match method which is known to be applicable to all types of reservoirs, i.e., oil or gas reservoir with or without gascap and/or aquifer, with accurate results.

In this paper, the calculation of pressure in the material balance method is briefly reviewed and the mechanism of pressure history match is cursorily discussed. Three case studies, comprising an abnormally pressured gas reservoir, a gascap drive reservoir and an aquifer water drive reservoir, are presented to illustrate the use of the new method. The calculation results of these cases are comparable to or better than those of using the material balance program alone. Moreover, the matches were obtained in only a few number of runs.

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