准噶尔盆地含油气系统的形成与演化

将准噶尔盆地划分为石炭系、二叠系、侏罗系和第三系四套含油气系统，其中石炭系和侏罗系是以含气为主的含(油)气系统，二叠系和第三系是以含油为主的含油(气)系统。根据烃源岩及其生成油气的分布，划出了含油气系统的分布范围:石炭系含(油)气系统分布范围为盆地中部的中拐—石西——五彩湾东西展布的条带并向东南延伸至三台凸起;二叠系含油(气)系统的分布范围包括西北缘、陆南凸起及其以南地区;侏罗系含(油)气系统分布于中央隆起带及其以南地区;第三系含油(气)系统分布仅限于南缘四棵树凹陷附近。并对四套含油气系统的形成与演化进行了深入分析，强调“关键时刻”在含油气系统形成中的重要作用。

THE FORMATION AND DEVELOPMENT OF PETROLEUM SYSTEMS IN JUNGAR BASIN

Four petroleum systems are studied in Jungar basin in this paper, which are Carboniferous, Permian, Jurassic and Tertiarypetroleum systems. Among them, Carboniferous and Jurassic systems are mainly gas-bearing systems, while Permian and Ter-tiary are mainly oil-bearing systems. Based on the distribution of source rocks and the characteristics of oil and gas, the rangesof these petroleum systems are determined. The range of Carboniferous gas-bearing system is a strip extending from Zhongguai-Shixi-Wucaiwan to Santai arch in the center of the basin ; Permian oil-bearing system includes the southern area of Northwesternedge and Lunnan arch; Jurassic gas-bearing system is located in the southern part of Centre up1ift; Tertiary system is limitednear Sikeshu sag in Southern margin of the basin. The formation and evolution of the four petroleum systems are also discussedin this paper, and the importance of critical moment in the formation of petroleum system is emphasized.