Abstract: According to the paleo-structural and geomorphic features in the sedimentation of lacustrine basin,the sequence of lacustrine basin can be divided into four types of alluvial,lake fault slope,flexure slope and gentle slope.The locations of lithologic trap and sandbody type and size in different sequence are all different in lithologic trap development.The sequence features are varied in different evolution stages of a basin.The sandbodies controlled by "valley" and "fault slope break" are the most favorable for development of lithologic trap in a fault-depression basin.The rival channel,lake shoreline and gentle slope are quite important for controlling the delta-front sand-body of lithologic trap in a depression basin.

Key words: lacustrine basin, sequence type, lithologic trap, development feature, delta-front sandbody

摘要： 依据陆相湖盆沉积时古构造和古地貌特征,可将湖盆发育的层序类型分为冲积型、湖泊断坡型、挠坡型和缓坡型等.在不同层序类型中,岩性圈闭发育的部位、砂体类型和规模均有较大差异.在湖盆不同演化阶段,发育的层序类型也有所不同.在断陷湖盆, 沟道与断坡所控制的低位砂体最有利于岩性圈闭的发育.在坳陷湖盆,河道、湖岸线和缓坡对有利于岩性圈闭发育的三角洲前缘砂体具有明显的控制作用.

关键词: 陆相湖盆, 层序类型, 岩性圈闭, 发育特征, 三角洲前缘砂体