摘要
对不同矿区、不同变质程度煤的 9个镜煤样品进行了激光拉曼光谱测定 ,并对其特征光谱进行了参数化。在 10 0 0～2 0 0 0 cm-1的波数范围内有两个明显的拉曼频率振动峰 G峰和 D峰。当镜质体反射率 Ro<2 .2 8%时 ,D峰位置随 Ro的增大向低波数位置偏移。G峰与 D峰峰位差和峰高比随 Ro的增大而增加。当 Ro约为 2 .1%时 ,拉曼光谱特征趋势发生逆转性变化。在 2 5 0 0～ 3 2 5 0 cm-1之间有一个明显的拉曼谱带 ,并随煤变质程度的增加呈现如下规律 ,其谱带的变化与有机质的成熟度演化具有一定的同步性 ,特别是在有机质进入成熟门限后 ,由于油相和气相成分的大量生成 ,出现明显的振动峰 ,而进入无烟煤 (Ro>4.4% )后 ,其振动峰变弱 ,因此 。
This paper presents the measurement of laser raman spectra of 9 vitrain samples of different ranks from 9 coal mines and their parameterization.Two outstanding vibration peaks G and D are found out in the wave number range of 1 000-2 000 cm -1 .The position of the peaks,the distance between peak G and peak D,the ratio of their heights change regularly with the increase of coal ranks.This paper also points out that the vitrinite reflectance has linear relativity to the position of peak D,the distance between peaks G and D and the ratio of their heights.Within the range of R o(vitrinite reflectance)<2.28%,the position of Peak D excurses toward the position of a lower value with the increase of the vitrinite reflectance.Both the distance of peaks G and D and the ratio of their heights increase as the vitrinite reflectance rises.It is found out that reverse transformation takes place in the tendency of laser raman spectra when the reflectance approximates to 2.1%.It is also found that in a range of 2 500 to 3 200 cm -1 of laser raman spectra,there are distinctive vibration peaks and their intensity increases with the rank of coals.The distinctive vibration peaks are found especially when the organic matters enter the maturation threshold,with the release of oil phase and gas phase,but when they enter anthracite ( R o>4.4) they will decrease.Therefore,it is assumed that the spectra alteration could be an indicator for organic maturation judgement in a sedimentary basin.
出处
《地质科技情报》
CAS
CSCD
北大核心
2002年第2期65-68,共4页
Geological Science and Technology Information
基金
国土资源部矿产资源定量预测及勘查评价形成研究实验室基金资助项目
