【作者】 任爱阁；

【导师】 贾瑞皋； 王卫华；

【作者基本信息】 中国石油大学 ， 无线电物理， 2007， 硕士

【摘要】 自然γ能谱测井是一种重要的核测井方法,实测谱解析技术是其地面处理系统的重要组成部分。由于自然γ能谱测井仪探测器的固有分辨率较低,测井过程中统计涨落和噪声干扰比较严重,其测量结果的重复性较差,测井置信度较低。直接解调方法是一种先进的数据处理技术,经高能天体物理的实践证明,直接解调方法比传统方法灵敏度高,空间分辨率好,尤其可用于统计性较差的观测数据。本文以中海油标准刻度井计数率谱为基础,把在天文上获得广泛应用的直接解调方法移植到自然γ能谱测井中,取得了初步的研究成果。成果如下:(1)利用Matlab编程处理中海油实验数据,得到了刻度井中放射性核素的标准计数率谱,分析并比较了自然γ能谱测井四种传统数据处理方法的优劣性,为自然γ能谱测井谱解析在方法选择上提供了坚实可靠的依据。(2)研究了直接解调方法的思想和实质,首次给出了胜利油田测井公司研制的自然γ能谱测井仪的响应函数,利用直接解调方法求得了标准刻度井的放射性核素含量,显示出直接解调方法的优越性,初步完成了自然γ能谱测井中直接解调方法的建立。更多还原

【Abstract】 Natural Gamma Ray Spectralog (SGR) is an important nuclear log method,and real spectral analysis is a pivotal compose of the surface processing system in SGR . The low confidence levels are leaded ,because of the inherent low resolution , strong statistical fluctuation and low signal noise ratio.The Direct Demodulation method is an advanced technique in the word to solve modulation equation interatively under physical constrains.It has a high sensitivity and spatial resolution than the traditional methods,and can compress the noise effect effectively.This thesis,based on the data of China Offshore Oil Logging Company SGR calibration Facility,performed preliminary research on the DD method in gamma-ray log.The results are:(1) The normal count pate spectrums are obtained form the test pits,the four traditional algorithms methods are tested,which offer credible basis for algorithm selecting.(2) The main idea of DD method is introduced.For the first time in Shengli Oil Logging Company,the Point-Spread-Funtion of Natural Gamma Ray Spectroscopy tool is obtained.The contents of radionuclide in calibration pits are obtained . The DD methed in gamma-ray log is established.更多还原