Abstract The Jurassic terrestrial shale on the northern margin of Qaidam Basin is characterized by high contents of organic matter but low maturity resulting in a lack of further research on shale gas in this area. To better understanding the shale gas potential of organic matter with different types, we conducted thermal maturity experiment of hydrocarbon generation from different kerogen types of low-mature shales under closed conditions. The results show that type II and type III kerogen have experienced similar hydrocarbon generation stages, but they differ in the hydrocarbon generation interval and evolution process between liquid hydrocarbon and gaseous hydrocarbon. Compared with Type III kerogen, type II kerogen is characterized by a low initial temperature at each evolutionary stage and wide temperature range, which caused the overall evolution of type III Kerogen lagged behind that of type II kerogen. The differential evolutions mainly result from the differences in hydrocarbon generation mechanism, hydrocarbon generation activation energy and kerogen macerals among different kerogen types. We summarized the evolution model of type II and type III Kerogen based on the characteristics of kerogen in hydrocarbon generation, carbon isotope change, pore development and other aspects. This work can provide theoretical and data support for reconstructing the hydrocarbon generation process of terrestrial shale gas, investigating the hydrocarbon generation mechanism, and predicting the hydrocarbon resources of terrestrial shale oil and gas on the northern margin of Qaidam basin and even China.

中文翻译：

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不同类型干酪根低成熟陆相页岩差异演化及影响因素——以柴达木盆地北缘侏罗系页岩为例

摘要 柴达木盆地北缘侏罗系陆相页岩有机质含量高、成熟度低，缺乏对该区页岩气的进一步研究。为了更好地了解不同类型有机质的页岩气潜力，我们对不同干酪根类型的低成熟页岩在封闭条件下进行了热成熟度生烃实验。结果表明，Ⅱ型和Ⅲ型干酪根经历了相似的生烃阶段，但在生烃区间和液态烃与气态烃的演化过程上存在差异。与Ⅲ型干酪根相比，Ⅱ型干酪根具有各演化阶段初始温度低、温度范围宽的特点，导致Ⅲ型干酪根整体演化滞后于Ⅱ型干酪根。差异演化主要是由于不同干酪根类型之间的生烃机制、生烃活化能和干酪根成分的差异造成的。结合干酪根在生烃、碳同位素变化、孔隙发育等方面的特征，总结出Ⅱ型和Ⅲ型干酪根演化模式。该工作可为柴达木盆地北缘乃至我国陆相页岩气生烃过程重建、生烃机理研究、陆相页岩油气油气资源预测提供理论和数据支持。差异演化主要是由于不同干酪根类型之间的生烃机制、生烃活化能和干酪根成分不同。结合干酪根在生烃、碳同位素变化、孔隙发育等方面的特征，总结出Ⅱ型和Ⅲ型干酪根演化模式。该工作可为柴达木盆地北缘乃至我国陆相页岩气生烃过程重建、生烃机理研究、陆相页岩油气油气资源预测提供理论和数据支持。差异演化主要是由于不同干酪根类型之间的生烃机制、生烃活化能和干酪根成分不同。结合干酪根在生烃、碳同位素变化、孔隙发育等方面的特征，总结出Ⅱ型和Ⅲ型干酪根演化模式。该工作可为柴达木盆地北缘乃至我国陆相页岩气生烃过程重建、生烃机理研究、陆相页岩油气油气资源预测提供理论和数据支持。不同干酪根类型间生烃活化能和干酪根成分。结合干酪根在生烃、碳同位素变化、孔隙发育等方面的特征，总结出Ⅱ型和Ⅲ型干酪根演化模式。该工作可为柴达木盆地北缘乃至我国陆相页岩气生烃过程重建、生烃机理研究、陆相页岩油气油气资源预测提供理论和数据支持。不同干酪根类型间生烃活化能和干酪根成分。结合干酪根在生烃、碳同位素变化、孔隙发育等方面的特征，总结出Ⅱ型和Ⅲ型干酪根演化模式。该工作可为柴达木盆地北缘乃至我国陆相页岩气生烃过程重建、生烃机理研究、陆相页岩油气油气资源预测提供理论和数据支持。