砂岩储层中自生伊利石定年分析油气藏形成期  

THE ISOTOPIC DATING OF AUTHIGENIC ILLITE AND TIMING OF HYDROCARBON FLUID EMPLACEMENT IN SANDSTONE RESERVOIR

作　　者：王飞宇[1] 郝石生[1] 雷加锦[2] 

机构地区：[1]石油大学北京 [2]中国科学院地质所

出　　处：《石油学报》1998年第2期40-43,共4页Acta Petrolei Sinica

基　　金：中国石油天然气总公司中青年创新基金

摘　　要：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。The authigenic illite in the sandstone reservoir was only formed in the diagenetic phase with mobile Krich pore water.The entry of hydrocarbon fluid in sandstone reservoir brought a halt to illite forming process,and if the illite can be isolated and its age determined the earlist time of the entry of hydrocarbons can be calculated.The results of K/Ar isotopic chronological analysis which was used to determine two groups of samples showed that the ages of diagenetic illite in Carboniferous sandstone reservoir of D area and Triassic condensate sandstone reservoir of J area in the Tarim Basin were 24.331.8M and 44.349.2Ma,reflecting that those petroleum reservoirs were formed in the Oilgocene and Eocene respectively.

关 键 词：自生伊利石 K/Ar定年 油气藏形成期 砂岩储层 

分 类 号：P618.130.1[天文地球—矿床学]