坡折带对陆相湖盆岩性地层圈闭的发育具有控制作用。海拉尔盆地贝西斜坡具有坡折带地貌特点，研究其特征和成因以及对沉积相和岩性地层圈闭的控制模式对该区的下步勘探具有重要意义。根据贝西斜坡坡折带的成因机制，将其划分为断裂坡折、挠曲坡折、沉积坡折和侵蚀坡折。根据坡折带位置与洼槽区的关系，将贝西坡折带坡折分为：内坡折带、中坡折带和外坡折带。外坡折带主要发育侵蚀坡折，控制着地层超覆圈闭带；中坡折带主要发育断裂坡折和挠曲坡折，控制着断块-岩性复合圈闭带；内坡折带主要发育沉积坡折，控制着透镜状岩性圈闭带。%The lithologic-stratigraphic traps in lacustrine basins are controlled by slope-breaks. Beixi Slope in Hailaer Basin has the characteristics of slope-breaks. It is important to study the features and genesis of slope-breaks, and the control mode of sedimentary facies and lithologic-stratigraphic traps to help identify favorable exploration area. By the genetic mechanism of Beixi slope-breaks, we can divide them into fault slope-break, flexural slope-break, sedimentary slope-break and erosive slope-break. According to the relationships between slope-break and subsag, we divide the slope-break into three cells-inner slope-break, middle slope-break and outer slope-break. The outer slope-break is characterized by erosion slope-break, controlling the stratigraphic overlap traps;the middle slope-break is mainly fault slope-break and flexural slope-break, controlling the block-lithologic combination traps; the inner slope-break is mainly sedimentary slope-break, controlling the lenticular lithologic traps.
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