准噶尔盆地西北缘风城油砂分布特征及成矿条件

准噶尔盆地西北缘风城地区蕴含着丰富的油砂资源，地表出露油砂形成多座规模不等的油砂山丘，面积约8km2，油砂主要存在于白垩系吐谷鲁组，连片集中、厚度大。风城下伏地层油砂分布面积大，层位稳定，产状缓，也主要分布在白垩统吐谷鲁组、上侏罗统齐古组中，含油率高、油质较好。该区油砂资源主要来源于玛纳斯湖凹陷二叠系烃源岩，这套烃源岩中生成的油气沿着该地区发育的断裂和不整合面向上运聚。断裂、不整合面及砂体的分布叠置构成了运移系统，有效的砂体既是运移通道又是储集体，最后建立了该区远源次生的油砂成矿模式。

Distribution and accumulation conditions of oil sands in Fengcheng area in the northwestern margin of the Junggar basin

There are abundant oil sands in Fengcheng area in the northwestern margin of the Junggar basin. Some mas- sif are composed of exposed oil sands, and the area is about 8km2. Oil sands with large thickness are mainly in cretaceous tugulu group. The oil sands of underlying strata in fengcheng distribute over a large area, and it has steady horizon and smooth occurrence. Oil sands abound in cretaceous tugulu group and upper jurassic qigu group, and it has high oil-bearing rate and good oil quality. The oil and gas of this area mainly originate from the permian source rock of Manas lake sag and accumulate upward along the developed fracture and the uncomfortable surface. The migration system is composed of frac- ture, uncomfortable surface and sand body. The valid sand body is the migration pathway and reservoir rocks. Finally, we give the metallogenetic model which is distal and secondary.