准噶尔盆地马桥凸起侏罗系油气成藏期次

综合各种油气成藏期次的分析方法,研究了准噶尔盆地马桥凸起侏罗系的油气成藏期次。认为中侏罗统头屯河组和西山窑级油藏主体在中晚侏罗世形成；下侏罗统三工河组和八道湾组混合油气藏具有多期成藏的特点,最初进入储集层的石油在中晚侏罗世,后期注入储集层的高成熟石油主要在晚白垩世,最后天然气成藏主要在早第三纪。同时认为,流体包裹体均一化温度与自生伊利石同位素年龄不一定都能记录油气成藏最早时间。

JURASSIC RESERVOIR-FORMING STAGES IN MAQIAO ARCH OF JUNGGAR BASIN

Jurassic reservoir-forming stages in Maqiao arch of Junggar basin were studied by applying various analyses methods, it is considered that Toutunhe and Xishanyao reservoirs in Middle Jurassic formed in Middle and bee Jurassic; Sangonghe and Badaowan combination reservoirs in Lower Jurassic are characterized by multiple stages reservoir formation, the oil entered into reservoir in Middle-Late Jurassic at first, high maturity oil in Late Jurassic, and natural gas in Paleogene. Moreover, it is suggested that homogenization temperature of fluid inclusion and isotope-age of authigenic illite can incompletely record the earliest time of forming oil/gas reservoirs.