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国内缝洞型碳酸盐岩油藏储层非均质性强、连通性差、油水关系复杂,储集体普遍含边底水且不具有统一油水界面,对油井动态储量错误的估计导致油藏钻井成功率普遍较低、开发效果差.如何定量评价该类型储集体的动态储量及水体大小,为下一步开发井位部署及开发技术政策的制定提供支撑是亟需解决的难题.本文基于Blasingame方法及流动物质平衡方法,推导了油藏拟稳态水侵情况下动态储量评价理论,提出了一种基于水侵动态识别方法进行动态储量及水体大小定量评价的流程与方法.本方法首先基于水侵识别方法将油井生产阶段划分为未水侵段、水侵初期阶段及水侵中后期段;然后通过拟合未水侵阶段油井生产动态数据进行动态储量的评价,通过拟合水侵初期油井生产动态进行水体大小的定量评价.通过建立考虑边底水的数值模拟概念模型,以正演的方式验证了本方法的可靠性.该方法已在国内哈拉哈塘缝洞型碳酸盐岩油田中进行了应用,应用效果较好.
The fractured carbonate reservoirs in China are characterized by high heterogeneity, poor connectivity and complicated oil-water relations. The reservoirs generally contain edge-water and do not have a uniform oil-water interface. The success rate is generally low, and the development effect is poor.How to quantitatively evaluate the dynamic reserves and water bodies of this type of reservoirs is the urgent problem to be solved in order to provide support for the next development well location development and development of technical policies.This paper is based on the Blasingame method And the method of fluid mass balance, the theory of dynamic reserve evaluation under the condition of quasi-steady-state water intrusion is deduced, and a flow and method of quantitative evaluation of dynamic reserve and water volume based on water intrusion dynamic identification method is proposed.Firstly, According to the identification method, the oil well production stage is divided into the non-water-intrusion stage, the early stage of water-invasion and the middle-late stage of water invasion. Then the dynamic reserve is evaluated by fitting the dynamic data of well production in the non-water- Production dynamic quantitative assessment of water body size.By establishing a conceptual model of numerical simulation considering edge water, The reliability of the method has been applied.The method has been applied in the domestic Halahatang fracture-type carbonate oilfield and the application effect is better.