Fisher判别分析法在核磁共振录井油水层识别中的应用  

Application of Fisher Discriminant and Analysis method to identifying oil and water layers in NMR logging

作　　者：刘杰 张涛[2] 王建[2] 黄子舰 宋建波 侯迎九 陈代厚 

机构地区：[1]盘锦中录油气技术服务有限公司 [2]中国石油长庆油田分公司 [3]中国石油渤海钻探工程有限公司 [4]中国石油大港油田公司

出　　处：《录井工程》2014年第1期25-29,90,共5页Mud Logging Engineering

摘　　要：Fisher判别分析法应用于核磁共振录井解释评价储集层是一种新尝试。应用该判别分析法,以鄂尔多斯盆地443组不同储集层核磁共振录井数据为分析样本,通过对不同储集层各样本孔隙度、含油饱和度、含水饱和度等10项参数的统计分析,筛选其中7项数据参与4个非标准化判别函数分析,对比各个判别函数方差贡献率,选用两个贡献率较大的函数Y1和Y2进行交会图板分析,在分别确定5类储集层"组质心"的基础上,计算各样品点到各类组质心的距离,遵循不同类样本类间离散度越大越好、同类样本内离散度越小越好的原则,应用SPSS 19.0软件对不同储集层的分类函数式(F1—F5)进行分析,建立判别函数模型,据此实现不同储集层解释评价。鄂尔多斯盆地443组不同储集层的回判分析证明,总体符合率为90.1%;2013年新钻预探井实际应用表明,总体判准率为80.3%。It is a new attempt to apply Fisher Discriminant and Analysis method to reservoirs interpretation and evaluation.Taking 443sets of NMR logging data from different reservoirs in Ordos Basin as analysis samples,through the statistical analysis on 10parameters of samples from different reservoirs,such as porosity,oil saturation,water saturation,etc.,7data were screened out to participate in 4non-standardized discriminant function analysis,the contribution rates of each discriminant function variance were contrasted,two major contribution rates of Y1and Y2 were used to carry out crossplot chart analysis.On the basis of respectively determining 'group centroid' in five categories of reservoirs,the authors calculated the distance of each sample point to various types of group centroid.Following the principle of the bigger the better for between-class scatter of different classes of samples,and the smaller the better for the scatter within the same class of samples,SPSS19.0software was used to analyze the classification functional expressions(F1-F5)of different reservoirs,establish the discriminant function model,accordingly achieve interpretation and evaluation for different reservoirs.The back discriminating analysis from 443sets of different reservoirs proved that the overall coincidence rate was 90.1%.Newly drilled wildcat wells in 2013showed that the overall correct discriminant rate was 80.3%.

关 键 词：核磁共振录井 特征参数 FISHER判别分析 储集层 分类函数 判别模型 油水识别 

分 类 号：TE142[石油与天然气工程—油气勘探]