The study of fluid inclusions in petroliferous basins is an effective method to understand hydrocarbon migration and accumulation. In this paper, the fluid inclusions in the Ordovician carbonate rock samples taken from the TS3, TP18, YQ8 and YJ2-3 wells in Tahe Oilfield are analyzed by experiments, the purpose is to explore the accumulation period of the Ordovician oil and gas reservoirs in the Tahe area and the reasons for the differences between different blocks.The results show that the Ordovician Yingshan Formation and the Yifangfang Formation in the Tahe area are rich in fluid inclusions, and there are only a single phase of oil, gas and brine in the phase. There are also two phases of oil, gas and water mixed with each other. According to the fluorescence characteristics and homogenization temperature of hydrocarbon inclusions, combined with the burial history-thermal evolution history of the study area, it is determined that the Tahe oil and gas reservoir is filled in the fourth stage, in the middle of the Caledonian period (454-446 Ma), and in the late Hercynian-Indosinian period (255-217 Ma), late Yanshanian period(143-99 Ma), Himalayan period (25-5 Ma).Among them, the middle of Caledon is mainly filled with low-mature oil, with a small amount of mature oil; the late high-mature oil in the late Hercynian is filled with some mature oil; the late Yanshan is mainly filled with high mature oil; during the Himalayan period, as the depth of burial continues to increase, the cracking of the accumulated hydrocarbons has occurred, mainly the migration of gas hydrocarbons. The four wells selected in this study belong to different tectonic units, after analysis, the author believes that the difference between single wells is on the one hand the influence of hydrocarbon thermal evolution and the other is influenced by tectonic movement.

含油气盆地流体包裹体研究是认识油气运聚的有效方法。本文对塔河油田TS3、TP18、YQ8、YJ2-3井奥陶系碳酸盐岩样品中的流体包裹体进行了实验分析，旨在探讨塔河油田奥陶系油气藏的成藏期次。研究结果表明，塔河地区奥陶系鹰山组和一方方组流体包裹体丰富，且仅发育单相油气、卤水。阶段。还有油、气、水两相相互混合。根据油气包裹体荧光特征和均一温度，结合研究区埋藏史-热演化史，确定塔河油气藏充注期为第四期，即加里东期中期(454-446 Ma)、海西-印支晚期(255-217 Ma)、燕山晚期(143-99 Ma)、喜马拉雅期(25-5 Ma)。其中，卡利登中期主要充满低熟油，并含有少量熟油；海西晚期晚期高成熟油中充满了部分成熟油；燕山晚期主要充满高成熟石油；喜马拉雅期，随着埋藏深度不断增加，聚集的烃类发生裂解，主要是气态烃的运移。本研究选取的4口井分属于不同的构造单元，经过分析，笔者认为单井的差异一方面是油气热演化的影响，另一方面是构造运动的影响。