混合煤样最大热解峰温与镜质体反射率的研究

A STUDY OF THE PYROLYSIS PARAMETER T AND VITRINITE REFLECTANCE FROM MIXED COAL SAMPLES

孙立中 李显宗 蔡龙珆

Sun Lizhong Lee Hsientsung Tsai Louis L

南开技术学院, 电机工程系, 台湾, 南投 2. 台湾中央大学, 地球物理研究所, 台湾, 中坜 3. 台湾中央大学, 应用地质研究所, 台湾, 中坜

Department of Electric Engineering, Nankai College, Nantou, Taiwan, China 2. Institute of Geophysics, National Central University, Zhongli, Taiwan, China 3. Institute of Applied Geology, National Central University, Zhongli, Taiwan, China

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。

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.

https://doi.org/10.11781/sysydz200703298