自然伽马测井的数字滤波方法

总结了数字滤波技术在自然伽马测井中的应用情况，介绍了数字滤波效果评价准则，分析了数字滤波效果的主要影响因素，并在此基础上提出滤波校正因子概念，以克服数字滤波对自然伽马测井曲线幅度带来的影响。阐述在编制地面系统自然伽马数字滤波软件时，应根据我国各油田具体地质条件和所用下井仪计数率高低，确定若干种不同的数字滤波方法，与之相应的数字滤波子程序可供实时测井时根据需要选用。在单片机系统中的应用验证了这一思路的正确性。

Digital filtering techniques for natural gamma ray logging

The paper summarizes the application of digital filtering techniques to natural gamma ray logging,and analyzes the criteria of judging digital filtering validity and the key factors affecting digital filtering validity. The paper also proposes the concept of filtering correction factor for the purpose of overcoming influence on logging curve amplitude of gamma ray logging caused by digital filtering. It is necessary to define several different kinds of filtering methods and corresponding digital filtering programs according to count rates of down hole tools and geological conditions of oilfields so as to be selected by nessary in real time logging. The correctness of the viewpoint is already proved in microcomputer system.