中文摘要：

通过不同样品的一次和二次生烃热模拟实验与地质分析相结合的方法得出煤岩一次生烃的iC4／nC4〉1、n（C6-C7）／i（C6-C7）〈0.8、甲苯／苯〉1.2和二次生烃的iC4／nC4〈1、n（C6-C7）／i（C6-C7）〉0.8、LP苯／苯〈1.2。对比孤北产出的煤成气与不同生烃过程热模拟实验生成的气体发现，孤北产出的煤成气的iC4／nC4为0.7、11（C6-C7）／i（C6-C7）为1.1、甲苯／苯为0.4，明显具有二次生烃特征，而且存C6-C7轻烃中，环烷烃〉正烷烃〉芳烃〉异构烷烃，与二次生烃模拟实验450-550℃（Ro约为1.3％-1.8％）牛成的气体特征非常相似，因此认为孤北煤成气是二次生烃的结果。

英文摘要：

By combining primary and secondary hydrocarbon generation modeling experiments of different samples and geological analysis, this paper gives the results that iC4/nC4 〉 1, n（C6-C7）/i（C6 -C7）〈0.8, toluene/benzene 〉 1.2 for the first generation and C4/nC4 〈 1 , n （C6 - C7 ） /i （ C6 - C7 ） 〉 0. 8 and toluene/ben-zene 〈 1.2 for the secondary generation in coal rocks. Comparing coal methane generated in Gubei area and gas produced in different hydrocarbon-generation thermal modeling experiments, the iC4/nC4 = 1 , n （ C6 - C7 ） /i （C6 - C7 ） = 1.1 and toluene/benzene = 0.4 of coal methane of the former are discovered with obvious features of secondary hydrocarbon generation. Moreover, in C6 - C7 light hydrocarbon, cycloparaffinic hydrocarbon 〉 normal paraffin hydrocarbon 〉 aromatic hydrocarbon 〉 isoalkane, possessing similarity to produced gas characteristics in secondary hydrocarbon-generation modeling experiment at 450 -550℃ （Ro= 1.3% - 1.8% ）. So the coal methane in Gubei area is considered as the product of secondary hydrocarbon generation.