脉冲中子-中子(PNN)测井技术及应用效果分析

Pulse neutron-neutron (PNN) oil well logging technology and its application effect analysis

PNN测井技术利用测量地层中剩余热中子数量随时间变化关系,从中提取地层的宏观俘获截面,计算储层的剩余油饱和度。其采集方式区别于其它脉冲中子测井,也具备独特的数据处理技术。文章简单介绍了PNN测井原理、解释方法,并结合实例认为,地层的宏观俘获截面是表征地层中子特性的参数,与地层岩性、裸眼井的伽马曲线有很好的对应关系;PNN测井资料解释须参考生产井史、邻井注水动态资料,才能得出准确的结论。

PNN oil well logging technology measures the relation that the quantity of surplus thermal neutron in the stratum changes over time to draw the macroscopic capture section of the stratum and calculate the degree of saturation of surplus oil of storing layer. Its gathering way distinguishes from that of other pulse neutron well logging and it also has the unique data processing technology. The article introduces the principle and the explanation method of PNN oil well logging. Combined with the examples,it points out that the stratum macroscopic capture cross-section is a parameter attributes to the stratum neutron characteristic and it has very good corresponding relationships with the formation lithology and the bare hole gamma curve; the PNN log interpretation can only draw the accurate conclusion with the reference to the history of producing wells and the flood performance materials of adjoining wells.