应用Bayes逐步判别方法识别东辛油田沙四段储层流体性质

Fluid property recognization in Es4 reservoir of Dongxin Oilfield with the application of Bayes stepwise discriminant method

东辛油田沙四段储层存在相当数量的低阻油层,油层、油水同层、水层测井响应特征比较接近,常规交会图法难以准确识别储层流体性质.本文介绍了Bayes逐步判别方法原理和技术流程,综合应用声波时差、自然伽马、自然电位、深探测电阻率、浅探测电阻率测井资料和生产动态资料建立了油层、油水同层、水层的判别函数.应用效果表明,Bayes逐步判别法识别油水层符合率达到了87.5%,可满足东辛油田沙四段储层流体性质识别的需要.

There are an amount of low resistivity oil layers in Es4 reservoir of Dongxin Oilfield. Conventional cross - plots are difficult to identify fluid property exactly because of the similar log response characteristic among oil layer, oil-water layer and water layer. This article introduces the principle and technique flow of Bayes stepwise discriminant method and uses acoustic travel time, gamma ray, self potential, formation true resistivity, flushed zone resistivity and production performance datas to build discriminant functions of oil layer, oil-water layer and water layer. The effect of application suggests that the identification accuracy rate of Bayes stepwise discriminant method to recognize oil-water layer reaches 87. 5%. It can meet the need of fluid property recognization in Es4 reservoir of Dongxin oilfield.