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目前页岩生烃的评价体系主要停留在静态条件下,忽略了成烃的动态过程,不能正确评价页岩原始的生烃潜力.采用生烃动力学模拟实验方法,分别对一个相对低成熟的典型海相富有机质页岩及其干酪根样品开展封闭体系和半开放体系下的人工熟化,并对熟化后的两个系列样品进行黄金管生气动力学模拟实验.对裂解产物中气态烃化合物、轻烃类化合物以及碳同位素开展了定量分析,结果表明,甲烷生成过程被划分为4个阶段,即生油(小于1.0%EasyRo)、凝析油生成(1.0%~1.5%EasyRo)、湿气生成(1.5%~2.2%EasyRo)和干气生成阶段(大于2.2%EasyRo);页岩中甲烷的最大产率主要来自干酪根的初次裂解(占22.7%)、可排沥青(占57.6%)和残余沥青(占19.6%)的二次裂解;经过早期排烃作用的页岩样品仍有大量的可溶沥青,在高-过成熟阶段其可以与干酪根、不可溶沥青相互作用,成为晚期主要的页岩生气母质.
At present, the evaluation system of shale hydrocarbon production mainly stays under static conditions, neglecting the dynamic process of hydrocarbon generation, and can not properly evaluate the original hydrocarbon generation potential of shale.Using hydrocarbon generation kinetics simulation experiment method, a relatively low maturity Typical marine organic-rich shale and its kerogen samples were artificially aged under the semi-open system and closed system, and two series of samples after aging were simulated by gold tube aerodynamics.The effects of gaseous hydrocarbon compounds, Light hydrocarbon compounds and carbon isotopes were analyzed quantitatively. The results show that the methane production process is divided into four stages: raw oil (less than 1.0% EasyRo), condensate oil (1.0% -1.5% EasyRo), moisture (1.5% ~ 2.2% EasyRo) and dry gas generation (> 2.2% EasyRo). The maximum methane production in shale mainly comes from kerogen cracking (22.7%) and bitumen (57.6%), And residual bitumen (19.6%). After the early hydrocarbon expulsion, shale samples still have a large amount of soluble bitumen which can interact with kerogen and insoluble bitumen during the high-overripe stage and become late stage The main shale gas Parent material.