准噶尔盆地乌伦古坳陷油气成藏系统分析

以油气系统理论为指导,从准噶尔盆地乌伦古坳陷的构造、烃源岩、储盖层、圈闭及输导等基本石油地质条件出发,对乌伦古坳陷进行了综合分析,划分出相应的成藏系统。研究结果表明,乌伦古坳陷内的晚石炭系泥岩、三叠系泥岩与侏罗系煤岩为主力烃源岩,主要储盖组合发育在侏罗系八道湾组、三工河组、西山窑组和石树沟群,圈闭条件与油气的运聚具有较好的配置;侏罗纪晚期与白垩纪是油气的主要成藏期;预测乌伦古坳陷内存在次生油气藏的可能性较大,南部斜坡和红岩断阶下盘勘探潜力大。

Analysis on hydrocarbon accumulation system in Wulungu depression of Junggar basin

Wulungu depression is located in the north part of Junggar basin.Based on the theory of petroleum system,the depression was analyzed according to basic petroleum characters as the feature of basin evolution,source rocks,cap rocks and reservoir-seal associations and trap types,and hydrocarbon accumulation systems was established.The results showed that the mudstone of late Carboniferous and Triassic and the coal rocks of Jurassic are major source rocks.The main reservoir-seal associations in Jurassic and Cretaceous were developed in Badaowan formation,Sangonghe formation,Xishanyao formation and Shishugou groups in the depression with the good configures of trap conditions,oil migration and accumulations.Late Jurassic and Cretaceous are the main periods of hydrocarbon accumulation.In Wulungu depression,secondary hydrocarbon reservoirs may exist and the south slope and footfall of Hongyan fault step zones were the exploration potential areas.