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烃类流体注入储层聚集成藏导致储层中自生矿物形成的抑制或中止,成岩矿物同位素地质年代学分析提供了成岩矿物形成的准确时间,成岩事件年代学研究可用于定量分析油气藏形成时间。砂岩储层中自生伊利石仅在流动的富钾孔隙水介质环境下才能形成,烃类流体注入储层后伊利石形成便会中止,因此,烃类流体进入储层时间不可能早于自生伊利石的形成时间。利用K-Ar同位素地质年代学方法分析塔里木盆地塔中4石炭系C_Ⅱ油藏、塔北东河塘石炭系油藏和吉拉克三叠系凝析气藏3个砂岩储层的自生伊利石形成时间,分别为246—278Ma、24.3—31.8Ma和44.3—49.2Ma,反映前者第一期成藏时间为晚二叠世,后两者的成藏时间在老第三纪。
Hydrocarbon fluid injection into the reservoir accumulates into a reservoir and leads to the suppression or termination of the formation of authigenic minerals in the reservoir. The isotopic geochronology analysis of diagenetic minerals provides the accurate time for the formation of diagenetic minerals. The diagenetic event chronology can be used to quantitatively analyze the formation time of oil and gas reservoirs . The authigenic illite in sandstone reservoirs can only form under the flowing potassium-rich pore water medium environment, and the formation of illite will stop after the hydrocarbon fluid is injected into the reservoir. Therefore, it is impossible for the hydrocarbon fluid to enter the reservoir earlier than the Erie self- Stone formation time. K-Ar isotopic geochronology was used to analyze the formation of authigenic illite in the Carboniferous C_Ⅱ reservoir in Tazhong 4, Carboniferous reservoir in East Hetang Reservoir in Tarim Basin, and the three sandstone reservoirs in Jilak Triassic condensate gas reservoir Time, respectively 246-278Ma, 24.3-31.8Ma and 44.3-49.2Ma, reflecting the former period of the first accumulation of Late Permian, the latter two accumulation period in the Old Tertiary.