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在准噶尔盆地上三叠统泥页岩地质与有机地球化学特征分析基础上,对准噶尔盆地达9井上三叠统泥页岩岩心含气量进行了测定,分析了页岩气的成分组成与碳同位素特征。泥页岩中有一定的含气量,主要在0.18~0.24m3/t之间,气体成分以烃类气体为主,二氧化碳、氮气等非烃气体含量较低。甲烷为烃类气体的主要成分,重烃含量较低,相同分子量的异构烷烃占优势,烃类气体具干气特征。非烃气体中的氮气含量明显高于二氧化碳。烃类气体碳同位素值较低,显示出常规低成熟原地腐泥型天然气特征,这种特征可能与短时间解析和烃源岩演化程度有关,具体原因有待进一步深入研究。
Based on the analysis of the geologic and organic geochemical characteristics of the shale in the Upper Triassic in the Junggar Basin, the gas content of the upper Triassic shale in the 9th well of Junggar Basin was measured. The composition of the shale gas and the carbon isotope feature. Some shale gas content, mainly in the 0.18 ~ 0.24m3 / t between the gas composition of hydrocarbon-based, carbon dioxide, nitrogen and other non-hydrocarbon gas content is low. Methane is the main component of hydrocarbon gas, the content of heavy hydrocarbon is lower, the isoparaffin of the same molecular weight is predominant, and the hydrocarbon gas is characterized by dry gas. The nitrogen content of non-hydrocarbon gas is significantly higher than that of carbon dioxide. Carbon isotope values of hydrocarbon gases are low, indicating the characteristics of conventional low-maturity in situ sapropelic natural gas, which may be related to the short-term resolution and the evolution of source rocks. The specific reasons are for further study.