基于宽能域伽马能谱测井的数字化关键技术研究

Gamma ray spectrum logging is an important method for the mine geology. In recent years, gamma-ray spectrum logging with wide energy range based on multi detector has become a hot research topic. Relating to oil and solid mineral field formation elements qualitative, quantitative, typical elements of lithologic and stratigraphic division etc. The existing gamma ray spectrum logging, with a single detector to form a plurality of independent system, unable to effectively modify the mutual interference between the gamma ray of wide energy range.The project’s research object is which the combination of multi detector and wide energy range spectrum measurement. It will reserch on the digital forming algorithm and spectral synthesis method of the wide energy range gamma ray spectrum measurement technology. The research content of this project includs three aspects are as follows. First, the project will reserch on the digital forming algorithm of gamma ray pulse signal of the output ray pulse of multi detector. Second, it will reserch on the spectral synthesis algorithm based on multi detector, and the linearization and normalization method of energy and detection efficiency. Third, it will establish the utility model of the digita technology of wide enery range gamma ray spectrum base on multi detector, and verified by simulation calculation, model experiment and field test. This project aims to provide basic method of wide energy range gamma ray spectrum measurement technology, provide basic technical for development wide energy range gamma ray spectrum measurement system, and in order to meet the application of wide energy range spectrum measurement.

伽马能谱测井是地质找矿中的重要研究方法。近年来，基于多探测器的宽能域伽马能谱测井在石油与固体矿产领域的地层元素定性、典型元素定量、岩性与地层划分等方面已成为研究热点。现有伽马能谱测井是以单探测器形成多个独立系统，无法将宽能域的伽马射线之间的相互干扰进行有效修正。为此，本项目拟以多探测器组合的一体化、宽能域能谱测量系统为研究对象，研究宽能域伽马能谱测量技术的数字成形算法与谱线合成方法。具体包括：一是多探测器输出的射线脉冲信号的数字成形算法；二是多探测器输出的谱线合成算法，以及能量和探测效率的线性化与归一化方法；三是建立多探测器宽能域伽马能谱数字化技术的实用算法模型，并采用模拟计算、模型实验、野外测试等手段加以验证。本项目旨在为宽能域伽马能谱测量技术的研究提供方法基础，为宽能域伽马能谱测量系统的研制提供技术基础，以满足宽能域能谱测量的应用需求。

伽马能谱测井是地质找矿中的重要研究方法。近年来，基于多探测器的宽能域伽马能谱测井在石油与固体矿产领域的地层元素定性、典型元素定量、岩性与地层划分等方面已成为研究热点。现有伽马能谱测井是以单探测器形成多个独立系统，无法将宽能域的伽马射线之间的相互干扰进行有效修正。本项目以多探测器组合的一体化、宽能域能谱测量系统为研究对象，研究宽能域伽马能谱测量技术的数字成形算法与谱线合成方法。项目采用以FPGA+DSP为核心的数字化射线脉冲采样与伽马能谱测量系统，研制了基于LaBr3(Ce)+ BGO的双探测器的宽能域伽马能谱测试系统样机；研究了数字化伽马能谱仪中的脉冲基线估计方法；研究了高斯成形、阶梯形成形、矩形成形、梯形成形等几种不同的数字滤波成形方法；研究了基于FPGA的多探测器输出谱线能量（道宽）的线性化与归一化方法、基于DSP的多探测器输出谱线探测效率的线性化与归一化方法，建立了相应的分析处理模型与算法模型，并通过模拟计算、模型实验等手段加以验证。项目研究成果可为宽能域伽马能谱测量技术的研究提供方法基础，为宽能域伽马能谱测量系统的研制提供技术基础，以满足宽能域能谱测量的应用需求。