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据流体包裹体显微镜观测和石油包裹体群的气体色谱和全烃色谱、色谱-质谱分析结果,句容和黄桥地区三叠系和下二叠系地层中的石油包裹体明显不同,句容地区三叠系灰岩储层中的石油包裹体的个体较大,在透光下为黄色-棕黄色,荧光显微镜下发亮黄色荧光,包裹体中气态烃的 C_1/C_(2-5)比值较低,液态烃中三环萜皖、五环三萜烷和规则甾烷系列的生物标志物化合物含量比较丰富,而句容和黄桥地区下二叠系石油包裹体比较细小,发黄色-黄绿色荧光,包裹体中气态烃的 C_1/C_(2-5)比值较高,液态烃中均难检测到甾萜烷系列的生物标志物。由流体包裹体均一温度等观测资料与捕获温度、捕获压力的 PVTsim的模拟计算结果:句容地区三叠系储层的石油包裹体捕获温度 Tr=107.9℃,捕获压力 Pr=289bar,约相当于白垩纪晚期(90～83Ma)充注成藏。句容地区下二叠深灰色灰岩中分布的油包裹体的捕获温度 Tr=123℃,捕获压力 Pr=305.95bar,反映白垩系晚期还有一期温度比较高的含烃流体充注的现象。黄桥地区在含 CO_2气藏的下二叠系存在有交切关系的,黄色和黄绿色两种荧光性质不同的石油包裹体,前者模拟计算的捕获温度 Tr=97.3℃,捕获压力 Pr=184.75bar,后者模拟计算的捕获温度 Tr=145.5℃,捕获压力 Pr=220.05bar,分别相当于白垩纪晚期(95～90Ma)和白垩纪末期(65～60Ma)有含烃流体运聚现象。但是,由于在白垩纪末-第三纪的抬升作用阶段,油气大量散失,因此在喜山期大量无机 CO_2充注成藏时期,储层中已不含烃类流体。
According to the results of fluid inclusion microscopy and gas chromatography and whole-hydrocarbon and GC-MS analysis of petroleum inclusion bodies, the petroleum inclusions in Triassic and Lower Permian strata in Jurong and Huangqiao are obviously different. Jurong The petroleum inclusions in the Triassic limestone reservoirs in the Triassic are larger in size, yellow-brownish yellow under light transmission, and bright yellow fluorescence under the fluorescence microscope. The C_1 / C_ (2-5) The ratio of tricyclic terpene Wan, pentacyclic triterpenes and regular steranes in liquid hydrocarbons is relatively abundant, while the Lower Permian oil inclusions in Jurong and Huangqiao areas are relatively small and yellow - yellow-green fluorescence. The C_1 / C_ (2-5) ratio of gaseous hydrocarbons in the inclusions is high, and it is difficult to detect the biomarkers of the steroidal alkanes series in liquid hydrocarbons. The simulation results of PVTsim obtained from observation data of temperature homogenization of fluid inclusions, capture temperature and capture pressure are as follows: the capture temperature of Triassic reservoir in Jurong area is 107.9 ℃, the capture pressure is Pr = 289bar, Late Cretaceous (90 ~ 83Ma) filling reservoir. The entrapment temperature of the oil inclusions distributed in the Lower Permian dark gray limestone in the Jurong area is Tr = 123 ℃ and the capture pressure is Pr = 305.95 bar, indicating that there is also a relatively high temperature hydrocarbon-bearing fluid charge in the late Cretaceous. There are two oil inclusions with different fluorescence properties, yellow and yellow-green in the Lower Permian of CO_2 gas reservoirs in Huangqiao area. The former simulated temperature, Tr = 97.3 ℃, capture pressure, Pr = 184.75 bar, the latter simulated temperature of Tr = 145.5 ℃ and pressure of Pr = 220.05bar, respectively, which corresponded to hydrocarbon migration and accumulation in the late Cretaceous (95-90Ma) and Late Cretaceous (65-60Ma), respectively. However, during the period of uplifting of Cretaceous and Tertiary, a large amount of oil and gas were lost. Therefore, during the period of a large amount of inorganic CO 2 charge and accumulation in the Himalayan period, no hydrocarbon fluid was contained in the reservoir.