物质平衡方法在缝洞型碳酸盐岩油藏能量评价中的应用

Application of the material balance method to the energy evaluation of fractured-vuggy carbonate reservoirs

把缝洞单元的驱动类型划分为封闭弹性驱动、有水侵的弹性驱动、有封闭水体的弹性驱动及有封闭水体和水侵的弹性驱动4种。给出了每种驱动类型的物质平衡方程,所给出的方程充分结合了缝洞型碳酸盐岩油藏的特点,区别于以往的物质平衡方程。提出了缝洞单元的弹性产率、水侵量及封闭水体的水体倍数等评价缝洞单元能量的指标,建立了缝洞型碳酸盐岩油藏的能量评价方法。该方法能够对缝洞单元能量特征和驱动类型进行判断,并对能量和水侵量进行定量计算。实例计算结果表明,建立的方法能够较好地评价缝洞单元的能量特征。

The driving mechanisms of the fractured-vuggy units are classified into four types： closed elastic drive, elastic drive with water invasion, elastic drive with elosed aquifer, and elastic drive with both closed aquifer and water invasion. A material balance equation is established for each type of driven mechanism. These equations take the characteristics of fraetured-vuggy carbonate reservoirs into full consideration, and thus are different from the former equations. This paper puts forward several indexes for evaluating the energy of fraetured- vuggry units, including the elastic production rate, the volume of water invasion and multiple of closed aquifer, and proposes a method for evaluation of fractured-vuggy carbonate reservoirs. This method can determine the energy characteristics of fractured-vuggy units and drive mechanisms and can be used to quantitatively ealculate the energy and invasion water volume. The calculated results show that the established method can be used to evaluate the energy characteristics of fraetured-vuggy units.