A STUDY OF THE PYROLYSIS PARAMETER Tmax AND VITRINITE REFLECTANCE FROM MIXED COAL SAMPLES
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摘要: 利用中国大陆地区两个高、低成熟度煤样,模拟再沉积物质来探讨其最大热解峰温(Tmax)的变化与其镜质体反射率(Ro)的对应关系。对依比例混合后的混合样进行热解分析,再将量测两煤样的镜质体反射率的资料点,以相同的比例用随机取样的方式将其混合后取平均值,以对应其Tmax的结果。实验结果显示:1)低成熟度煤样,在混有不同比例高成熟度煤样时,其Tmax值将反应低成熟度之情形,即取含有再沉积的岩层样品,其Tmax将呈现年轻地层的成熟度。2)对高成熟度的物质采样或进行热解分析的过程中,即便是在极微量的情况下,亦应避免受低成熟度物质的污染。3)随着低成熟度煤样配比的增加,Tmax迅速下降,其与Ro的关系与Ⅲ型干酪根的线性对应呈现明显差异。Abstract: Reworked sedimentary materials were simulated by mixing of high and low rank coals in various proportions,so as to evaluate the variation of Tmax from Rock-Eval pyrolysis.The results indicate that(1) once the low rank coal is mixed with high rank coal,the Tmax is close to that of the low rank coal,whatever the mixing ratio is;(2) care must be taken for reworked samples,especially for organic materials with high maturity,even dealing with a very small amount of sample mixing;(3) Because of the fast dropping of Tmax after increasing mixed ratio of low rank coal,the correlation of Ro and Tmax is quite different from the linear trend possessed by type-Ⅲ kerogen.
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Key words:
- reworked /
- Rock-Eval pyrolysis /
- Tmax /
- vitrinite reflectance
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