【摘要】 据构造活动及沉积层序充填特征分析 ,昌图凹陷地层层序可以划分为裂陷 (SSⅠ )、断陷 (SSⅡ )和坳陷 (SSⅢ )3个超层序 ,其中SSⅡ由SⅡ1、SⅡ2 两个层序构成。层序SⅡ1、SⅡ2 又可细分为低位体系域、湖盆扩张体系域、湖盆收缩体系域 ,发育有冲积扇、扇三角洲、前扇三角洲—半深湖、浅湖—沼泽相沉积体系。由于凹陷的幕式伸展造盆作用影响 ,凹陷断陷充填期曾两度湖泛 ,相应地在湖盆扩张体系域发育期充填了两套暗色泥岩密集段 ,从而形成了凹陷上下叠置的阜新组 (煤系烃源岩 )及沙海—九佛堂组 (湖相烃源岩 )两个含油气系统。更多还原

【Abstract】 The sequence stratigraphic units in Changtu Sag include three supersequences(SSⅠ,SSⅡ,SSⅢ),and the supersequence SSⅡ can be divided into two sequences(SⅡ 1 and SⅡ 2).Based on the tectonic movement and basin_filling sequence in Changtu Sag,the sequences are farther divided into lowstand system tract,expansion and contraction system tract of lake_basin.The system tracts are composed of depositional system of fan_shaped alluvium,fan_shaped delta,half_depth_lake and shallow_lake and lacurine swamp.As for an influence of episodic extension_form_basin,Changtu Sag has undergone two lake_overflow during rift_filling stage,meanwhile it filled concentrated strata of black_mudrock during forming expansion system tract of lake basin stage and it established two typical petroleum systems which are organic rock of coal_bearing series and lake_facies.更多还原