混合地层水对测井解释剩余油分布的影响研究

Study of Influence of the Mix Formation Water to the Interpretation of Remaining Oil Distribution by Logging

我国绝大多数油田都是采用注水开发的,水淹层测井解释评价剩余油分布就显得尤为重要。研究剩余油分布,最关键的是水淹层剩余油饱和度的确定。根据多年从事测井解释的经验,分析了水淹层由于注入水与地层水综合作用对于测井电阻率、自然电位、声波时差三方面的影响。认为混合地层水特性是影响水淹层测井解释的难点,并提出了低渗透储层基于纯水砂岩和含泥质砂岩计算水淹层含油饱和度的经验公式。

The method of water-flooding is adopted for most oil field in our country, so the logging interpretation of remaining oil distribution in water-out reservoirs is particularly important. To Study the remaining oil distribution, the most key is to determine the flooded residual oil saturation. In this paper, the effects of interaction between injected water and formation water on the re- sistivity of logging, natural potential and AC acoustic is studied, and it is concluded that characteristics of mixture formation wa- ter are difficulties that affect logging interpretation of the floo- ded. A calculation formula of oil saturation of the water flooded layer is put forward due to the sandstone filled with water and the sandstone containing shaly reservoir in low permeability reservoir.