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干酪根、煤以及显微组分生烃过程中的动力学参数 (如活化能分布特征等 )是其内部分子结构的宏观反映 ,据此可以判断有机质内部成键特征 ,评价生油门限、生油高峰 ,计算不同温度范围油气生成量等。笔者利用岩石热解仪 (Rock- Eval 型 )对贵州水城含树皮体煤中的主要组成——基质镜质体的成烃动力学特征进行了研究 ,并与树皮体、丝质体进行比较 ,结果表明 ,基质镜质体的平均活化能为 2 0 0 k J/ mol,大于树皮体的平均活化能 (1 77k J/mol) ,而小于丝质体的平均活化能 (32 4 k J/ mol) ,由此推断 ,在相同的热演化条件下 ,基质镜质体、树皮体、丝质体三者的生烃顺序为树皮体→基质镜质体→丝质体。从基质镜质体生烃活化能分布特征图上可以看出 ,基质镜质体有 4次主要生烃期 ,其对应的活化能分布范围及产烃率分别为 1 91 .2 5— 1 92 .5k J/ mol、1 2 .1 9% ,1 95— 1 96.2 5k J/ mol、7.2 5% ,1 97.5— 1 98.75k J/ mol、39.82 % , 2 1 6.2 5 k J/ mol、1 8.64% ,据此可以认为 :基质镜质体主要由 4种不同类型键组成。在活化能 1 91 .2 5— 1 98.75 k J/ mol范围内 ,基质镜质体的累计生烃率达 60 %左右 ,这说明基质镜质体产烃较集中 (在较短的地质剖面或温度范围内形成大量烃类物质 ) ,再加上其含量高 (煤岩?
Kinetic parameters (such as the distribution of activation energy) during the hydrocarbon generation process of kerogen, coal and micro-component are the macroscopic reflection of the internal molecular structure, which can determine the internal bonding characteristics of organic matter, evaluate the oil production threshold, Peak oil, calculate the temperature range of oil and gas generation and so on. The rock pyrolysis instrument (Rock-Eval type) was used to study the hydrocarbon-forming kinetic characteristics of matrix-bodied vitrinite, which is the main component of bauxite bauxite in Guizhou. The results show that the average activation energy of the matrix vitrinite is 200 kJ / mol, which is larger than the average activation energy of the bark (1 77 kJ / mol) and less than the average activation energy of the filament k J / mol). It is inferred that under the same thermal evolution conditions, the order of hydrocarbon generation of the matrix vitrinite, bark body and filamentous body is bark body → substrate vitrinite → filamentous body. It can be seen from the characteristic map of activation energy distribution of matrix vitrinite that the matrix vitrinite has four major hydrocarbon generation periods and its corresponding activation energy distribution range and hydrocarbon generation rates are respectively 1 91. 2 5 -1 92 .5 kJ / mol, 1 2 .1 9%, 1 95-1 96.2 5k J / mol, 7.2 5%, 1 97.5-1 98.75 kJ / mol, 39.82%, 2 1 6.2 5 kJ / mol, 1 8.64%, from which we can think: matrix vitrinite mainly by four different types of key composition. The cumulative hydrocarbon generation rate of the matrix vitrinite reached about 60% at an activation energy range of 1192.5-198.75 kJ / mol, indicating that the matrix vitrinite produces more concentrated hydrocarbons (in the short geological section or The formation of a large number of hydrocarbons within the temperature range), coupled with its high content (coal rock?