THE POTENCIAL OF IN-SITU ASH CONTENT PREDICTION USING LOW-ENERGY COMPONENT OF GAMMA-GAMMA LOGGING
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摘要: 伽玛-伽玛测井中的散射伽玛射线低能部分的强度和地层的原子序数有关,因而能用来对煤层的灰分值作原位测量。对8 个矿区164 个煤样的计算表明,这种用煤层等效原子序数来确定灰分值的方法对煤的变质程度、水分含量变化不敏感,但对灰的元素组成变化,尤其是Fe2O3 含量变化比较敏感。因而在使用这一方法测量煤层灰分时,应寻求区域性的相关关系。同时测量散射伽玛射线的高能部分和低能部分,可以获得地层密度和与地层岩性有关的等效原子序数这两个参数Abstract: The intensity of low energy gamma rays in gamma gamma logging is related to the atomic number of the formation being measured.Based on chemical analysis data of 164 coal sample from 8 mines,calculation results show that the method in which equivalent atomic number is used for in situ ash content evaluation is not sensitive to the rank and moisture content of the coal but quite sensitive to the ash composition,especially to Fe2O3 content.Therefore,regional correlation should be established when in-situ ash content prediction is conducted.Measuring the intensities of both high-and low-energy gamma-rays,the two parameters of formation density and equivalent atomic number,which is related to the formation lithology, can be derived at the same time.
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Keywords:
- coal ash /
- gamma-gamma logging /
- spectrometric analysis
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