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孤东油田七区西馆陶组储层先后经历了注淡水、注咸污水和注聚开发阶段,测井响应复杂,应用常规交会图难以识别聚驱后水淹级别.本次研究基于聚驱后测井响应机理实验、聚驱前和聚驱后“对子井”测井响应的对比分析开发了水淹级别的主成分识别方法.首先,实验考察了聚合物溶液、聚合物驱岩样的声速、电阻率特征,认为聚合物自身的声速、电阻率性质对储层声速、电阻率的影响可以忽略.其次,选取“对子井”对比分析了聚驱前、聚驱后不同级别水淹层的测井响应的变化规律及机制,并基于敏感性分析筛选了对水淹级别比较敏感的Rxo、SP、RT、△MN曲线作为水淹级别识别曲线.最后,应用主成分分析方法建立了测井响应识别水淹级别的标准.2口井的应用效果表明,该方法可满足该储层聚驱后水淹层识别的需要.
The Xishantantao Formation reservoir in Block 7 of Gudong Oilfield has undergone the stages of injection, saltwater and injection polymerization, and the well logging response is complex. It is difficult to identify the flooding level after the poly flooding by using the conventional cross-plotting. After the well logging response mechanism experiment, before the poly-flooding and after the polymer flooding “comparison of the” well logging response analysis developed the main component identification method of flooding level.Firstly, the experimental study of the polymer solution, polymer flooding The acoustic velocity and resistivity of the rock samples are considered, and the influence of the velocity of sound and the resistivity of the polymer on the sound velocity and resistivity of the reservoir can be neglected.Secondly, before the poly-flooding, And the variation regularities and mechanisms of logging response of waterflooded layers at different levels were selected. Based on the sensitivity analysis, the curves of Rxo, SP, RT and △ MN, which were sensitive to flooding levels, were screened out as the flooding level identification curves.Finally, The composition analysis method establishes the standard of logging response recognition flooding level.2 The application results of the two wells show that this method can meet the need of water flooded layer identification after the polymer flooding.