束缚水饱和度与储层流体性质的判别  

APPLICATION OF IRREDUCIBLE WATER SATURATION TO IDENTIFYING RESERVOIR FLUID NATURE

作　　者：杨仁林[1] 刘知国[1] 

机构地区：[1]四川石油管理局测井公司研究所

出　　处：《天然气工业》2003年第z1期46-48,共3页Natural Gas Industry

摘　　要：储层流体性质的判别是测井评价的主要任务之一 ,也是测井分析家重要课题之一。关于储层流体性质的判别 ,方法虽不少 ,但往往由于受到测井信息的限制或者方法自身适用条件不好把握 ,造成了“方法不少 ,却‘难以效法’”的局面 ,究其原因 ,在于对事物的本质揭示的不够。文章通过对在储层演变过程中可动水饱和度及束缚水饱和度变化规律的分析和对大量实际例子的考证 ,提出了根据 φ—Sw 交会图中数据点的分布特征 ,判断储层是否含有可动水 ,进而对储层含流体性质进行判别的方法。该方法经过实践的检验 ,取得良好效果 ,并已广泛地应用于科研与生产实践 ,大大地提高了测井解释符合率。由于该方法侧重于考察交会图中数据点的总体分布特征 ,并不拘泥于孔隙度和含水饱和度是否反映储层的真实情况 ,即不会因为m、n值、Rw、Nsh、Tsh等取值的误差 ,导致把气层特征变为水层特征或者把水层特征变为气层特征。该方法还具有可操作性强、快速直观的特点。The identification of reservoir fluid nature is one of the main tasks of log evaluation and also one of the important themes of log analysis.Although there were quite a few methods of identifying reservoir fluid nature,this situation of 'Thers were not a few methods,but it was difficult to learn from them'was caused often because of being limited by log messages or inconveniently grasping at the applicable conditions of these methods themselves,which is traced to revealing the essence of the things insufficiently.Through analyzing the law of the change in movable water saturations and irreducible water saturations in the process reservoir variation,it was pointed out that whether the reservoir contains movable water may be identified and then the reservoir fluid nature can be determined according to the distribution characteristics of data points in φ vers S w crossplot.Good result has been achieved through the method′s being examined in practice,so that this method has been widely used for scientific research and real production,thus raising the coincidence rate of log interpretation greatly.In this method,the special emphasis is laid on examining the general distribution characteristics of the data points in the crossplot,which doesn′t rigidly adhere to whether the real situation of reservoir may be reflected by the porosities and satuations,i.e. which doesn′t make gas-bearing layer be misjudged as water-bearing layer or the latter be misjudged as the former because of the valuing errors of m,n,R w,N sh and T sh .This method is of the characters of operability,high speed and intuition.

关 键 词：测井 储集层 孔隙度 可动水 束缚水 饱和度 

分 类 号：TE311[石油与天然气工程—油气田开发工程]