储层流动单元研究在油田老区挖潜中的应用——以吉林油田乾146区块开发为例

Applications of Reservoir Flow Unit in Potential Finding of Developed Reservoir:A Case Study on Exploitation of Block Qian-146 in Jilin Oil Field,NE China

吉林油田乾146区块经多年开采,已经进入高含水、高采出阶段。通过储层流动单元研究,运用多参数模糊聚类方法将该区高台子油层由好至差划分为A、B、C、D、E 5类储层流动单元。查明了区内主要目的层系各含油小层的储层流动单元发育特征:40、39小层主要发育A、B类优质储层流动单元,42、41、38小层则以C、D、E类储层流动单元为主,各小层储层流动单元类型及展布与初始产能吻合度较高,表明储层流动单元类型的差异是控制本区油气分布的重要因素之一。综合油藏地质特征及油田开发动态数据,对各储层流动单元的注采渗流体系进行了深入剖析,归纳总结出乾146区块高台子油层XII砂组中剩余油分布的5条规律,据此在剩余油分布预测区部署了1口扩边井和2口老区加密井,投产后分别获得了11.2t/d、5.5t/d和8.6t/d的初始产能。

Block Qian-146 in Jilin oil field has underwent an high water content and high production stage after years of exploration.Gaotaizi oil layer in this block can be divided into five types of reservoir flow units including A,B,C,D and E type ranked from good to poor.The features of the reservoir flow units of main target series of layers are described through multi-parameter vague clustering method.The 40 and 39 layers mainly develop type A and B reservoir flow units,and 41,42 and 38 layers mainly develop type C,D and E reservoir flow units.The types and distributions of reservoir flow units of all layers show a high goodness of fit with original energy production which demonstrates that the difference among reservoir flow units is an important factor that control the oil distribution.The instill,extract,permeation and flow systems of all reservoir flow units are studied through comprehensive analysis of geologic features of reservoir and dynamic data during oilfield development.Five laws of the distribution of remaining oil in XII of Gaotaizi oil layer,thus one delineation well,two old district infill well are arranged in the estimation range of remaining oil distribution.After putting into operation,original energy production is 11.2 t/d,5.5 t/d and 8.6 t/d separately.