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民丰地区天然气存在源岩热解和原油裂解成因的争议。本文采用高压釜封闭体系对该区烃源岩和原油样品分别进行了热模拟实验,从烃类气体生成过程、气态烃与部分单体烃生成动力学特征讨论了二者的生气机理,认为原油裂解比源岩热解生气活化能高30~40 kJ/mol,原油比源岩生气需要更高的热力学条件。模拟实验证实,成熟阶段源岩热解气与原油裂解气相比,以环烷烃和芳烃相对含量低为特征,与民丰地区产出的天然气组成更接近,据此认为该区天然气主要为源岩热解成因。
Natural gas in Minfeng area is controversial about the origin of pyrolysis and crude oil cracking. In this paper, autoclave closed system was used to simulate the source rocks and crude oil samples in this area respectively. The formation mechanism of hydrocarbon gas and kinetics of some hydrocarbon generation were discussed. It is concluded that the crude oil The pyrolysis activation energy of pyrolysis is 30-40 kJ / mol higher than that of source rocks, and the crude oil needs higher thermodynamic conditions than source rocks. The simulation results show that the source rock pyrolysis gas at mature stage is characterized by low relative content of naphthene and aromatic hydrocarbon and close to that of natural gas output in Minfeng area. Therefore, the natural gas in this area is mainly source rock Cause of pyrolysis.