利用Fisher判别分析技术识别火山岩油水层

Identification of Volcanic Oil and Water Layer by the Fisher Discriminatory and Analytical Technology

准确识别火山岩油水层是火山岩测井解释的关键,常规的油水层划分方法不能有效地识别火山岩油水层。利用统计和交会图分析方法,确定用于流体性质识别的测井曲线;运用Fisher法提取测井曲线特征,建立油水层分析的第1、第2典则函数;采用最小平方误差准则建立分类判别函数,形成判别准则。该方法应用于准噶尔盆地西北缘八区佳木河组的老井复查的测井解释中,精度明显高于常规的交会图法,为火山岩储层评价、油水层判别提供了有力的证据。

To accurately identify the oil-water layer of volcanic rocks was the key for logging interpretation of volcanic rocks,and conventional method could not effectively used to identify the volcanic oil-water layer.The logging curve for identification of fluid was determined by using statistical and crossplot analytical methods,the characters of logging curves were extracted for establishing the first and second canonical functions by using Fisher method,and the classification and discriminant function was established and the discriminant criteria were created by using the least square error.The method is successfully applied to the re-examination of the old well logging interpretation of Permian system at the northwestern margin of Karamay Oilfield,the accuracy is significantly higher than that of conventional crossplot,it provides a strong evidence of discrimination of oil-water layer of volcanic rocks.