基于流动单元基础上的水淹层定量识别方法研究——以宝浪油田宝北区块为例

Method of Identifying Water Flooded Layers on the Basis of Flow Units:A Case Study from Baobei Block in Baolang Oilfield

针对常规测井在低渗透油藏的水淹层解释中符合率低的问题,改变以往单纯用含油层段测井资料笼统计算含水饱和度来判断水淹层的方法,采用以流动单元为基础的新方法对水淹层进行了定量识别。首先从修正的Kozeny-Carman方程出发,将宝浪油田宝北区块的储层定量划分为5类流动单元;在此基础上将中子寿命测井结果与常规测井资料相结合,建立了不同流动单元下淡水水淹层和地层水水淹层的解释模型。用新井样点的含水饱和度数据进行了检验,运用模型计算出的含水饱和度与中子寿命测井获得的含水饱和度相比平均值只差3%。同时,对6口生产井的11个小层进行了生产测试验证,符合率达82%。

When traditional well logs are used for interpreting water flooded formation in low permeability reservoirs, it is difficult to attain a coincidence rate. This paper introduces a new method used to identify the water flooded layers on the basis of the flow unit. In the Baobei block of Baolang Oilfield, the reservoir is plotted into five flow units according to the function of Kozeny-Carman. Based on the five flow units, the interpretation models of freshwater and formation water are built, using the data of traditional log and neutron lifetime log. These models are verified with water saturation of 16 sampling sites of a new well, showing the difference value of water saturation of calculating and neutron lifetime log only 3%. At the same time, the models verified by the data of production from 6 wells 11 layers exhibit the coincidence rate of 82%.