厚油层内部夹层分布模式及对开发效果的影响  

The Distribution Patterns of the Interlayers within Thick Pays and Their Impact on Recovery Efficiency,Shuanghe Oilfield

作　　者：陈程[1] 孙义梅[1] 

机构地区：[1]中国地质大学,北京100083

出　　处：《大庆石油地质与开发》2003年第2期24-27,共4页Petroleum Geology & Oilfield Development in Daqing

摘　　要：油田开发后期,厚油层内夹层是控制复杂水淹形式的主要地质因素,是合理调整层内注水结构和产液结构的基础,因此研究夹层及其分布规律具有重要意义。在充分利用密闭取心、密井网、水淹测井解释、数值模拟和生产动态测试资料的基础上,精细剖析了双河油田厚油层内部夹层分布规律及对开发效果的影响。研究表明:双河油田厚油层内部夹层发育,夹层岩性主要为深灰色或灰色泥岩、粉砂质泥岩、泥质粉砂岩、钙质砂砾岩、泥粉质砂砾岩;夹层的物性上限是:渗透率为20×10-3μm2,孔隙度是12 5%;各类夹层具有明显的电性特征,可以利用自然电位的异常幅度和微电极幅度差判别夹层,判别成功率达95 6%;夹层分布具有明显的规律性,可以划分为三种分布模式:随机型、过渡型、连续型,体现了夹层在厚油层内纵向、横向和平面分布的差异性;夹层阻碍了重力驱替,降低了波及体积系数,严重影响油田开发效果。但可以利用夹层采用选择性射孔、局部细分层系、封堵高含水层等措施挖掘剩余油,在双河油田稳油控水中发挥了显著效益。During the late period of development, the interlayers and their distributions have significant implications, because the interlayers within thick pays control the types of waterflooding and the basis of justifying the injection and production structures. The interlayers within thick pays and their influence on recovery efficiency in Shuanghe oilfield are dissected in this paper by using sealed coring data,closely spaced wells, waterflooding log evaluation,numerical simulation and performance data. The analyses indicate that the interlayers which developed in the thick pays of Shuanghe oilfield are composed of dark grey or grey mudstones,silty mudstones,muddy siltstones,calcareous sandstones or conglomerates,muddy or silty sandstones and conglomerates;the upper cutoffs of physical properties of the interlayers are 20×10 -3 μm 2 for permeability and 12 5% for porosity. With apparent electric characters,95 6% of interscan be identified by SP log and microlog. The distribution of interlayers can be divided into three patterns:stochastic,transitional,continuous. They show the differences of distribution of interlayers. The interlayers have substantial impact on production efficiency by impeding gravity flood/drainage or decreasing sweep efficiency. According to this knowledge,however,we took several measures such as alternative perforation,subdivision of development units,shut in of high water cut layer,to optimize recovery. These measures have played important roles in stabilizing production and contrlling water cut.

关 键 词：厚油层 夹层 分布模式 开发效果 注水结构 产液结构 分布规律 

分 类 号：TE321[石油与天然气工程—油气田开发工程] TE12