Abstract
For a long time, the material balance equation has been recognized as one of the essential tools used by reservoir engineers for predicting the development performance of a reservoir. It can be used to estimate the original reserves of oil and gas (original oil-in-place (OOIP) and original gas-in-place (OGIP)), reservoir performance, and the ultimate recovery factor. The concept of material balance was first proposed by Schilthuis in 1936. The simplest form of the equation is expressed in terms of volume, namely, original volume = remaining volume + removal volume. To apply the material balance equation, two necessary conditions must be satisfied. The first condition is that there is sufficient production history and PVT data, and the second is that the average formation pressure expressed by time or cumulative production must have a depletion trend. This chapter introduces the material balance equation of homogeneous gas reservoirs, the compartmental material balance equation for heterogeneous gas reservoirs, and the sensitivity analysis of critical parameters.
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