Investigation on Secondary Generation of Hydrocarbons by Thermal Modelling of Kerogen
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摘要: 本文通过热模拟实验研究，认为未进入高、过成熟阶段的生油岩因构造运动等因素使其上升或被剥蚀，地温下降，生烃过程停止。当再次下沉达到一定温度时，未耗尽的有机质则可能再次生烃。连续生烃的量与二次生烃总量很接近，表明二次生烃不影响生烃总量，只是延缓了生烃过程而已。即是说，单从生烃量的角度看，如果不考虑其它因素．二次生烃并不影响对生油岩的质量评价。Abstract: Based on results from thermal modelling experiments of kerogens,this paper presents a brief discussion on secondary generation of hydrocarbons. Geological effects, such as structural movement, etc.,may result in liftion or denudation of source rocks which do not enter highly-and post-mature phases, which causes the decrease of geotemperature of the source rocks and the cease of hydrocarbon generation. While the source rocks subside .again, the geotemperature increases, and when it reachs a certain point, the unexhaused kerogens may generate hydrocarbons again.The generated oil-gas amount with the continuous process of hydrocarbon generation is close to the total amounts of twice generations, indicating that hydrocarbon-generating amount is not affected by the secondary hydrocarbon generation that only defer generating oil and gas.
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