低熟页岩生烃特征的热模拟实验研究

发布时间：2018-02-14 02:57

  本文关键词： 页岩 热模拟 Ro 总烃产率 岩石热解　出处：《地学前缘》2017年06期 　论文类型：期刊论文

【摘要】：采用高压釜热模拟实验方式对页岩样品的成熟度进行改变,并对成熟度改变过程中页岩的生烃情况及热解参数进行了分析。研究表明:Ro随着温度的增高,分为三个阶段:缓慢变化阶段、中等增加阶段和快速增加阶段。随着R_o的升高,气态烃的产率一直是上升的,而液态烃的产率后期是下降的,裂解烃量(S_2)则由于转化为气态烃等含量迅速降低,但总烃增加量是有变化的。当R_o为0.65%和1.0%时出现二个生烃高峰,这反映了低成熟页岩在生烃演化过程中的三个阶段,即初期热降解阶段、热降解-热裂解阶段和热裂解阶段。而R_o与总烃产率在热模拟过程中则近似呈一条指数曲线关系,根据二个生烃高峰,进而确定了我国陆相盆地页岩气远景区R_o的下限为0.65%,页岩气有利区R_o的下限为1.0%。
[Abstract]:The maturity of shale samples was changed by means of autoclave thermal simulation experiment. The hydrocarbon generation and pyrolysis parameters of shale were analyzed in the process of variation of maturity. The results show that: Ro increases with the increase of temperature. It is divided into three stages: slowly changing stage, medium increasing stage and fast increasing stage. With the increase of Rstio, the yield of gaseous hydrocarbon has been rising, while the yield of liquid hydrocarbon has been decreasing in the later stage. The amount of pyrolysis hydrocarbon is rapidly decreasing due to the conversion to gaseous hydrocarbon content, but the total hydrocarbon increase is changed. When R _ O is 0.65% and 1.0, there are two peaks of hydrocarbon generation, which reflects the three stages of hydrocarbon generation evolution of low-mature shale. That is, the initial thermal degradation stage, the thermal degradation-pyrolysis stage and the pyrolysis stage. However, in the process of thermal simulation, the relationship between R _ s _ o and total hydrocarbon yield is approximately an exponential curve, according to the two peaks of hydrocarbon generation, Furthermore, the lower limit of Rak _ o in shale gas remote area of continental basin in China is 0.65 and the lower limit of R _ O is 1.0 in the favorable area of shale gas.
【作者单位】： 中国地质大学(北京)能源学院;
【基金】：国家科技重大专项“不同类型页岩气生成机理与富集规律研究”(2016ZX05034-001)
【分类号】：P618.13
，

本文编号：1509714