论文部分内容阅读
本文通过对采自爱沙尼亚库克赛特奥陶系油页岩水岩反应过程的研究，探讨了未成熟藻干酪根的油气生成特征．通过对热模拟实验的分析发现，藻干酪根的生烃潜力是相当高的，但其未成熟油生成量却是相当低的，其水岩反应较好地再现了油气的演化过程与特征，很难形成规模性的油气藏。该藻干酪根液态富范围较宽，成熟阶段倾向于生油，不利于成气，且在生成的气中非烃占优势．在高成熟阶段由于油的裂解可大量生成轻质烃和凝析油，早期生成的气态烃较少，晚期气态烃量增加。气态产物中以CO2占优势，气态烃中甲烷含量最高，仅含少量烯烃。在正异构烃的组成中，正构烃含量很高，导构烃含量较少。在液态产物中，热解油食量占优势，生油高峰在330℃附近。模拟时间对水岩反应有一定影响，模拟时间的延长利于油的裂解和气态烃的增加。
In this paper, the hydrocarbon generation characteristics of immature algal kerogen are discussed through the study on the reaction process of the water-rock collected from the Ordovician oil shale in the Cooksate, Estonia. Through the analysis of thermal simulation experiments, it is found that the hydrocarbon generation potential of kerogen is quite high, but the production of immature oil is quite low. The water-rock reaction can well reproduce the evolution process and characteristics of oil and gas, Difficult to form large-scale reservoirs. The kerogen has a wide liquid-rich range and tends to generate oil during the mature stage, which is detrimental to gas formation and predominates in the generated gas. In the high mature stage, light hydrocarbons and condensates can be generated in large quantities due to the cracking of oil. The amount of gaseous hydrocarbons generated in the early stage is small, and the amount of gaseous hydrocarbons in the late stage is increased. The gaseous products are dominated by CO2, with the highest content of gaseous methane and only a small amount of olefins. In the composition of normal-isomeric hydrocarbons, normal-hydrocarbon content is high, the content of the guided-hydrocarbon is less. In liquid products, pyrolysis oil appetite prevails, crude oil peak around 330 ℃. The simulation time has a certain influence on the water-rock reaction, and the extension of the simulation time is conducive to the cracking of oil and the increase of gaseous hydrocarbons.