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庞巨丰 ,李敏 ,韩继勇 .热中子时间谱测井谱的解析 .测井技术 ,2 0 0 0 ,2 4(1) :14～ 19介绍了用脉冲中子源与热中子探测器组成的测井系统 ,获取热中子时间谱。提出的多参数热中子时间谱数学模型 ,以改型变尺度和线性搜索等较新的最优化计算方法获得 1～ 3种地层介质时间谱解析结果。从数学模型出发 ,生成两种类型的仿真谱 :理想仿真热中子时间谱和含统计涨落的仿真热中子时间谱 (计数 >15为正态分布 ,计算 <15为泊松分布 )。再用该数学模型拟合上述两种仿真谱 ,解析的精度分别为 :τi≤ 0 .8%、Ai≤ 4%、α≤ 10 % ;τi≤ 3%、Ai≤ 6 %、α≤ 15 %。对于实验测得的热中子时间谱 ,用该数学模型拟合 ,解析的精度为τi≤ 2 %、Ai≤ 8%、α≤ 15 %。
PANG Ju-feng, LI Min, HAN Ji-yong.Analysis of thermal neutron time spectrum logging well. Logging Technology, 2000, 24 (1): 14-19 Logging system to obtain the thermal neutron time spectrum. Proposed multi-parameter thermal neutron time-spectrum mathematical model, modified scale and linear search and other more recent optimization methods to obtain 1 to 3 kinds of formation media time spectrum analysis results. From the mathematical model, two types of simulation spectra are generated: the ideal simulated thermal neutron time spectrum and the simulated thermal neutron time spectrum with statistical fluctuations (count> 15 for normal distribution and <15 for Poisson distribution). The mathematical models were then used to fit the two kinds of simulation spectra. The accuracy of the analysis was as follows: τi≤0.8%, Ai≤4%, α≤10%; τi≤3%, Ai≤6%, α≤15% . For the experimentally measured thermal neutron time spectrum, with the mathematical model fitting, the analytical precision is τi≤2%, Ai≤8%, α≤15%.