摘要
井眼条件及围岩环境不统一导致测量的自然伽马值出现不同程度的失真,对失真产生的误差进行补偿可以提高曲线纵向分辨率。介绍自然伽马测井的基本原理,建立模型,求取仪器探测范围的解析表达式,并按照采样间隔对探测范围进行分层处理。通过计算各层对测井值的贡献权值实现对自然伽马测井值的校正。实际测井资料应用表明,校正前孔隙度相对误差16.2%,校正后孔隙度相对误差4.1%,校正后的孔隙度计算更为精确。
Due to the various surrounding rocks and borehole environments, the natural gamma signals are distorted to some extent. By compensating the deviation resulted from the distortion, we will get higher vertical resolution of natural gamma logs. Introduced is the basic principle of natural gamma logging. Established is an appropriate model to obtain the instrument detection range, which is layered according to different sampling intervals. The natural gamma log data calibration is realized by computing different contribution weights of each layer. Practical applica- tion shows that relative porosity error before calibration is 16.2%, and after calibration it is re- duced to 4. 1%. It is concluded that the calculation improved by using the above method. accuracy of natural gamma logging porosity is
出处
《测井技术》
CAS
CSCD
北大核心
2012年第2期160-163,共4页
Well Logging Technology
关键词
自然伽马测井
探测范围
孔隙度
权函数
分辨率
natural gamma logging, detection range, porosity, weighting function, resolution
