Abstract: Based on thestructural features and formation mechanism of hydrocarbon-bearing struc-tures in Miyang depression it is classified into 5 types:(1)Reversal-drag structure in Shuanghe area;(2)soft clay-shale(gypsum)plastic struc-tures in Guchen and the west of Raoliang region;(3)block-faulted structures in Wangji andSinzuang area;(4) differential compaction structures in Ginlou area;(5)Slump structure inXiaomagang area.Evolution history in Miyang depression can be divided into initial fault-de-pression period,major fault-depression period and ending of fault-depression period.It issupposed that the axis of principal extension stress in the early phase of basin evolution innortheast oriented and is being north-west oriented in Miyang depression.

Key words: basin evolution, structural type, stress field, fault depression

摘要： 泌阳凹陷的构造特征和形成机制,可分为5种成因构造类型:①位于双河地区的逆牵引构造;②位于古城和饶良西部地区的泥(膏)塑性流动构造;③位于王集一新在地区的块断构造;④位于井楼地区的差异压实构造;⑤位于小马岗地区的滑塌构造.综合分析凹陷内构造和沉积展布特征与配置关系可以推断盆地演化早期主张应力轴为北东向,晚期为北西向.泌阳凹陷的演化历史可分为初始断陷期、主断陷期和断陷结束期.

关键词: 盆地演化, 构造类型, 应力场, 断陷