濮城油田沙三段中亚段1～5油藏储层流动单元分类评价

Classification and evaluation of the flow unit of the middle Es_3^(1-5) reservoirs in Pucheng oilfield.

根据取心井分析资料,对成因单元内影响流体渗流的地质参数进行相关分析研究,选取对渗流能力影响大的四个参数,即孔隙度、渗透率、储层质量指标和流动层带指标作为划分连通体内部流动单元的标准。选用模糊综合聚类分析方法,将工区流动单元分为四类。评价结果表明,一、二类流动单元储层性质好,流体渗流能力强,注水受效程度高,因而水驱效率高,但随着注水开发的进行,这类储层易形成水窜通道,导致油井见水快甚至水淹;三类流动单元储层性质差,流体在其中渗流能力弱、水驱效率低,是潜在剩余油分布的储集单元;四类流动单元则主要是孔渗性很差的干层,可视为渗流屏障,开发效果较差甚至极差。

Based on the analytical data of cored well, the geological parameters that influence the fluid percolation in the genetic unit are correlatively analyzed. Porosity, permeability, RQI (reservoir quality indicator) and FZI (flow zone indicator) are selected as the main parameters for flow unit recognition and classification. In the research area, four kinds of flow units are classified by the method of synthetic fuzzy clustering analysis. E-valuation results show that type Ⅰ and Ⅱ have good reservoir nature, strong percolating ability and good water-floodability, the water injection response is good , but along with water injectio, waterflood channeling path is easy to be formed in these reservoirs and the correspondent oil well is easy to be influenced and even be watered out. Type Ⅲ has poor reservoir nature, weak percolating ability and low waterflood efficiency, and it will be the potential reservoir unit of residual oil. Type Ⅳ is mainly of dry layer with very poor porosity and permeability, which can be look as percolating barrier and the development response is poor or very poor.