一种计算储采比的新方法及其应用

New method of calculating reserves-production ratio and its application

马 东 刘 波 董 淼 刘 敏 陈 欢

长江大学石油工程学院，湖北 荆州 434023 长江大学油气钻采工程重点实验室，湖北 荆州 434023 吐哈油田分公司三塘湖采油厂，新疆 哈密 803009

储采比是指一个国家、一个区块或一个油气田，在某年份剩余的可采储量与当年产量的比值。通过储采比可以分析、判断油田所处开发阶段，稳产状况及其资源保证程度。从储采比与递减率的定义出发，推导了双曲递减、指数递减条件下储采比变化公式，储采比与阶段递减率的关系。从理论上分析了不同递减类型的储采比变化规律。Li-Horne模型可以用来拟合和预测水驱开发油田的产量，通过该模型来计算可采储量，并提出了该模型下的储采比计算方法；通过理论推导表明，在产量递减阶段，Li-Horne模型和双曲线模型下的储采比随时间而增大，而指数递减则保持不变；并通过实例应用证明了Li-Horne模型下产量递减阶段的储采比变化趋势。

Reserves-production ratio is defined as the ratio of remaining recoverable reserves to annual production rate in a year for a country, an area or an oil-gas field. Reserves-production ratio can be applied for analyzing the field development stage, stable production situation and resource guarantee degree. From the definitions of the reserves-production ratio and the decline rate, the varying formulas of reserves-production ratio and the relation between the reserves-production ratio and stage decline rate are derived under the condition of hyperbolic decline and exponential decline in this paper. The varying laws of reserves-production ratio of different decline types are analyzed theoretically. Li-Horne model can be used to match and predict the production of waterflooding field. The recoverable reserves can be calculated and a calculation method of reserves-production ratio is proposed based on the model. The theoretical analysis shows that the reserves-production ratio, with Li-Horne model and hyperbolic model, will increase with time in production decline stage, but the reserves-production ratio of exponential decline model will not be changed. The case application result demonstrates the change trend of reserves-production ratio at production decline stage on the basis of Li-Horne model.