陆相储集层流动单元定量研究新方法

A new quantitative method to study flow unit of non-marine reservoir

对已开发油田 ,准确预测剩余油的空间分布、合理制定开发调整方案的关键 ,是对油气藏的认识要符合地下地质情况。储集层流动单元是一个横向和垂向上连续的储集带 ,为地下流体渗流的基本单元 ,它综合反映了储集层的岩性、物性及微观孔喉特征。因此提出 ,从取心井入手 ,通过优选参数 ,建立流动单元的原模型 ,应用聚类和判别分析 ,建立各类流动单元的数学判别函数 ,对非取心井进行流动单元划分 ;进而引入地质统计学方法 ,应用序贯指示模拟进行井间流动单元的预测。应用该方法 ,将高尚堡油田高 3 10 2断块的主力小层流动单元划分为A、B、C3类 ,现场生产动态资料验证了该方法的有效性。划分结果对储集层分类评价、寻找有利储集相带、预测剩余油富集区、调整开发井网和提高采收率均达到了目的。

Most of oil fields in our country have now entered into middle-high water-cut phase. In order to stablize and increase production, it is critical for oil fields to predict corr ectly the distribution rules of remaining oil, make rationally development plan and as a result, increase recovery factor. Subsurface condition should be correc tly recognized to gain this target. Flow unit is a continuous reservoir region, within which reservoir's physical characteristic is similar horizontally and vertically. As the basic seepage unit of subsurface fluid, flow unit is the com prehensive reflection of reservoir's lithology, physical feature and micro p ore thro at characteristic. This paper brings forward a new quantitative method to build flow unit model. Firstly, the original flow unit is made through selected parame ters from core wells, then discriminant function of flow unit is arrived by clu ster and classifies analysis, and with which flow units of wells that haven't obtained cores are able to be determined. Consequently, sequential indicator simulation, one of geo-statistic methods, is introduced to predict flow units b etween wells. Three types of flow unit (that is A, B and C) are plotted out in F ault Block Gao 3102, Gaoshangpu oil field with this method, which is testified b y the dynamic data of oil field production. According to flow units, we can eval uate reservoir, find favorable regions, predict remaining oils, adjust developme nt well patterns, and as a result increase recovery factor.