油气开采是油藏能量驱动的结果。 油藏能量评价是油气开采过程中的一项基本工作。 传统的油藏 能量评价指标为无因次弹性产量比和采出 1% 地质储量的地层压降，但这 2 个指标均出现了逻辑反转的 评价结果，即油藏越开采能量反而越强。 为了科学评价油藏的驱动能量，提出了油藏能量指数法，即油藏 压力与井底极限压力的比值。 该方法与油井的举升方式密切相关，且能正确评价油藏的能量变化规律，即 油藏越开采能量越弱。 应用实例表明，能量指数法比传统方法更为简便、实用。

Oil and gas production from reservoirs is the result of drive of reservoir energy. Reservoir energy evaluation is a routine job during exploitation of reservoirs. Conventional evaluation parameters of reservoir energy are the dimensionless elastic production ratio and the pressure drop per recovery of reservoir reserve. However, the two evaluation parameters both give out logically inverse results, i.e. the reservoir energy is increasing with the depletion of reservoirs. In order to evaluate reservoir energy scientifically, this paper proposed energy index method, which is the ratio of reservoir pressure to limit bottom pressure of production wells. The new method is closely related to the lift style of wells, and can properly evaluate the reservoir energy status with the reservoir energy decreasing while depletion. The application result shows that the energy index is easier and more practical to use than the conventional method.