大庆外围油田特低渗透油藏水淹层综合评价方法

受低渗透储层内部复杂孔隙结构的影响，测井曲线值对岩层中流体变化的反映能力较弱，仅利用测 井资料来判别储层的水淹程度存在困难。 有效借助油藏注水开发过程中关于注水井与采油井间连通砂 体的动态开发信息（如含水率、小层相对吸水率等），可以在一定程度上分析出砂体当前的水淹程度。 具 体实现步骤为：①从各种测井方法的基本原理出发，研究油层水淹后测井曲线值的变化特征，并给出基本 的水淹程度识别标准，将以这些标准识别出的水淹层定为疑似水淹层；②在构建动态开发单元的基础上， 依据邻注水井各小层吸水能力、邻采油井分层或整体产液过程中含水率的高低，针对疑似水淹层进行进 一步的水淹程度判定。 将上述 2 个步骤应用到大庆外围特低渗透油田水淹层判别中，应用效果良好。

Integrated evaluation method of water flooded layer in ultra-low permeability reservoir in peripheral Daqing Oilfield

Affected by the internal complex pore structure of low permeability reservoir, the reflecting ability of logging value to the changes of fluid in the formation is weak. Thus, it is difficult to use logging data to distinguish water flooded degree of reservoir. It can reflect the current water flooded degree of sand body by using dynamic information which is from interconnected sand body between injection wells and production wells during the water injection development process. The implementation steps are as following: （1） study the variation characteristics of logging value of flooded layers by using basic principle of logging methods, give the identification rules of water flooded degree, and divide the layers which satisfies these rules to uncertain flooded layers; （2） on the basis of building dynamic development unit, carry out further determination for the water flooded degree of the uncertain flooded layers according to the water absorbing capacity of small layers and water content of separate layer during the fluid production process from in adjacent wells. These two steps were applied to identify water flooded degree in ultra-low permeability oilfield in peripheral Daqing Oilfield, and good application effect was obtained.