双源距碳氧质量比能谱测井数据处理中虚拟探测器的设计与应用

Design and application of virtual detector in data processing of the dual-space C/O spectral logging data

双源距碳氧质量比能谱测井仪测井时,中子产额必须达到额定值,否则需采用降低测速,重复测量的方式降低曲线的统计涨落. 为此,提出了在数据处理过程中设置虚拟探测器的方法,在中子产额低于额定值时,不需重复测量即可提高曲线信噪比、降低曲线统计涨落. 实际应用结果表明,该方法可提高测井时效,延长中子管的使用寿命.

Neutron yields have to attain the rated value during the dual-space C/O operation. If the neutron yields are below the lower limit, measures are usually taken to decrease the statistics of the curves, such as the speed slowdown, or taking multi-passes measurements while the speed is slowed down. So the paper presents a method of setting virtual detector to improve signal/noise ratio, and to decrease statistics of the curves in the data preprocessing. Field application results show that this method can improve the efficiency of well logging and prolong the service life of the neutron tubes..