Standard spectrum measurement and simulation of elemental capture spectroscopy log  

元素俘获能谱测井标准谱测量与模拟(英文)

作　　者：武宏亮[1] 李宁[1,2] 兰长林[3] 孔祥忠[3] 柴华[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]长江大学,湖北434023 [3]兰州大学,甘肃730000

出　　处：《Applied Geophysics》2013年第1期109-116,120,共9页应用地球物理（英文版）

基　　金：sponsored by the National S&T Major Special Project(No. 2011ZX05020-008)

摘　　要：We have established a set of laboratory measurements which is used for capturing element gammma spectrum. Standard captured gamma ray spectra for ten elements, including Si, Ca, Fe, are obtained using the measurements for the first time in China. We also simulated the capture gamma ray spectra of the ten elements using Monte Carlo methodology with the same parameters of our experimental measurements. Comparing the experiment and simulation results with the data from the International Atomic Energy Agency＇s Nuclear Data Center, we obtained the standard captured gamma ray spectra of the ten elements, which, as calibration spectra, are used to calibrate the raw spectrum in data processing. This method solved the key problem during the conversion from the original measuring spectrum to the yield of each element in the data processing. The method can effectively improve the accuracy of the element yield calculation.为了解决目前元素俘获能谱测井解释中,根据原始测量谱难以准确获得各个元素产额的困难,本文建立了一套先进的测量元素俘获伽马能谱实验方法,首次获得了硅、钙和铁等10种元素的标准俘获伽马能谱;并利用蒙托卡罗方法在同样条件下模拟得到了上述10种元素的标准模拟俘获伽马能谱。将这两种方式获得的元素标准俘获伽马能谱与国际原子能机构核数据中心数据进行对比分析,从中确定了可用于实际元素俘获能谱测井解谱计算的硅、钙和铁等10种元素的俘获伽马能谱。这一结果有效解决了元素俘获能谱测井资料处理过程中由原始测量谱到各元素产额转换过程中的关键技术难点,可有效提高元素产额的计算精度。

关 键 词：Elemental capture spectroscopy log capture gamma ray spectrum Monte Carlo simulation 

分 类 号：P631.81[天文地球—地质矿产勘探]