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砂岩储集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，烃类流体注入储集层后自生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Ｄ区石炭系油藏和Ｊ区三叠系凝析气藏二个砂岩储集层的自生伊利石形成时间，分别为２４．３～３１．８Ｍａ和４４．３～４９．２Ｍａ，反映油气藏形成期前者为渐新世，后者为始新世。
Authigenic illites in sandstone reservoirs are only formed under flowing potassium-rich pore water medium conditions, and formation of authigenic illite will stop after hydrocarbon fluids are injected into reservoirs; therefore, it is not possible for hydrocarbon fluids to enter the reservoirs earlier In the birth of illite formation time. The K / Ar isotopic geochronology method was used to analyze the formation time of the authigenic illites from the Carboniferous reservoir in D zone of Tarim Basin and the Triassic condensate reservoir in J zone, which were 24.3 ~ 31.8Ma And 44.3 ~ 49.2Ma, respectively, reflecting that the former is Oligocene during the formation of oil and gas reservoirs, and the latter is Eocene.