摘要
二连盆地阿尔善油田为砂砾岩中孔低渗油田,目前已进入注水开发中后期.由于储层薄、非均质性严重、物性差、地层水矿化度低,加之油层与弱、中、强各级水淹层共存,高压层与低压层交错分布,致使水淹层的识别与水淹等级的划分较为困难,定量解释难度更大.在分析水淹前后储层物性、含油性、地层水矿化度、地层压力等储层性质变化的基础上,将水淹层划分为6种类型,即低压弱水淹、低压中水淹、低压强水淹和高压弱水淹、高压中水淹、高压强水淹,并分别给出了识别方法和典型实例,适合于地质分析和开发生产.提出了一种用常规测井资料求取剩余油饱和度的方法,平均绝对误差为6.09(%),可有效地用于定量分析.
As a sandstone conglomerate reservoir with medium porosity and low permeability, Arshan oil field in Erlian Basin is entering into a medium high water cut development stage. Several factors, such as thinner reservoir, poor petrophysics, high heterogeneity, low water salinity, coexistence of various watered out zones(low, middle and high) and alternation of low and high pressure layers, has made it difficult to identify watered out zones and their grades, with a quantitative interpretation even harder. Based on analyses of changes in reservoir petrophysics, oil bearing properties, formation water salinity and formation pressure before and after water flood, six types of watered out zones can be recognized, including low watered out zone with low pressure, medium watered out zone with low pressure, high watered out zone with low pressure, low watered out zone with high pressure, medium watered out zone with high pressure, and high watered out zone with high pressure. Their identification methods and typical cases are also given, applicable to geological analysis and field development and production. In addition, an calculating approach to remaining oil saturation is presented by using conventional logging data, with an average relative error 6.09%, and can effectively be used in quantitative analysis.
出处
《中国海上油气（地质）》
2001年第4期280-285,共6页
China Offshore Oil and Gas(Geology)
关键词
阿尔善油田
水淹层
测井解释
剩余油饱和度
求取
watered out zone
remaining oil saturation
log interpretation
reservoir with low permeability
Erlian Basin
