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Petroleum Reservoir Engineering Practice by Nnaemeka Ezekwe

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Chapter 7. The General Material Balance Equation

7.1 Introduction

The General Material Balance Equation (GMBE) as developed in this book is based on an oil reservoir with a primary gas cap at initial conditions and reservoir pressure designated as pi. At a later time, t, reservoir pressure is assumed to have been reduced from pi to p from production of oil, water, and gas. During the production period, it is assumed that there was water influx into the reservoir from an aquifer. It is also assumed that water and/or gas was injected into the reservoir. These conditions are illustrated in Figure 7.1.

Figure 7.1 Material balance model for an oil reservoir.

The description of the equation that is developed as a material balance equation is in ...

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