Abstract: The sequence stratigraphy,sedimentology and petroleum geology were used to study the architectural model of sequence stratigraphy controlling the distribution of litho-trap in deep-water lake of Songliao depressive basin.It is found that during the depositional period from Qingshankou Formation to Nenjiang Formation,Songliao Basin was a deep-water depressive lake.The slope of the basin was gentle along the long-axis and was steep along the short-axis.Along the long-axis,the distributary channel of delta was developed very well,but the mouth-bar,distal-bar and lake-floor-fan sediments were thin.Along the short-axis,the mouth-bar,distal-bar and lake-floor-fan sediments were developed in the order toward lake-direction and lacking in the sediments of distributary channel of delta.The litho-trap was mainly developed in the depositional area of mouth-bar,distal-bar and lake-floor-fan on the gentle slope,or in the depositional area of lake-floor-fan on the steep slope.

Key words: Songliao Basin, depressive lacustrine basin, sequence stratigraphy, architectural model, control, litho-trap

摘要： 运用层序地层学、沉积学及石油地质学理论,研究了松辽盆地深水坳陷湖盆期(青山口组到嫩江组沉积时期)的层序构成模式对岩性圈闭分布的控制,结果表明,青山口组到嫩江组沉积时期,松辽盆地为深水坳陷湖盆.沿长轴方向为缓坡,三角洲水下分流河道十分发育,在河口的前方形成分布较广、相对较薄的河口坝、远砂坝沉积及湖底扇.沿短轴方向为陡坡,三角洲水下分流河道不发育,而发育河口坝和远砂坝,向湖区方向过渡为前三角洲和深湖沉积,在前三角洲和深湖沉积区发育重力流成因的湖底扇.长轴缓坡部位,岩性圈闭主要发育于河流—三角洲复合体靠近深湖区的边缘地带.在盆地陡坡部位,岩性圈闭主要发育于陡坡坡底的前三角洲和深湖沉积区多种重力流类型成因的湖底扇.

关键词: 松辽盆地, 坳陷湖盆, 层序地层学, 控制作用, 岩性圈闭