海拉尔盆地乌尔逊凹陷南部油气成藏期次研究

综合应用圈闭形成时期、烃源岩生排烃史、包裹体均一温度和储层自生伊利石测年等4 种方法对乌尔逊凹陷南部油气藏的形成时期进行了研究。认为研究区油气成藏期主要分为两个阶段: 第一阶段在距今110 ～ 90 Ma，相当于伊敏组沉积晚期，是研究区最主要的成藏期。油气大规模注入储层时期在100 ～ 92 Ma，此时为烃源岩大量生排烃期，油气运移动力充足，有利于油气运移并聚集成藏。第二阶段始于青元岗组沉积。青元岗组沉积以来，发生过近东西向的挤压反转，使已形成的油气藏重新调整，同时，二次生成的油气继续注入成藏。

Research on the reservoir-forming stages in southern Wuerxun Depression of Hailaer Basin

To research the reservoir-forming stages in the southern Wuerxun Depression，the authors studied the history of traps，hydrocarbon generated and expulsion，homogenization temperatures of fluid inclusion and illite dating． There are two main forming stages of oil-gas reservoir in the southern Wuerxun Depression． The first stage is 110 ～ 90 Ma，corresponding to the sedimentary period of the upper Yimin Formation． It is the main forming time of oil － gas reservoirs in the southern Wuerxun Depression． The majority of forming period of oil and gas is 100-92 Ma，which is the period of abundant hydrocarbon generated and hydrocarbon expulsed process． In the period，sufficient migration force was helpful to the formation of oil-gas reserviors． The second stage is from the sedimentary period of the Qingyuangang Formation． The oil-gas reservoirs formed in the first stage was adjusted by tectogenesis and it is the second formation process of oil-gas reservoirs．