Abstract:

This paper, on the basis of the structural characteristics analysis in Changling fault depression, Songliao basin, states the structure development history, which underwent rift and fault depression, with complicated geological textures and developed faults. The complicated structure shapes which are derived from fault morphology and fault combination are composed of stretch, compression and strike-slip types. The major traps include anticline, broken nose-fault block, stratigraphic, and structurallithologic traps. Changling fault depression is chiefly controlled by the stretch structure and the broken nose-fault block traps. These traps are close to sources, with faults connected to hydrocarbon and a succeeding development of vertical multiple traps, indicating an excellent reservoir forming condition.

摘要：

针对松辽盆地长岭断陷的构造特征进行分析，阐述了长岭断陷的构造发育史。长岭断陷经过了裂谷、断陷、坳陷等不同的演化阶段，地质结构比较复杂，断裂发育。由于断层形态、断层组合方式不同而表现出复杂多样的构造样式，主要有伸展构造样式、挤压构造样式、走滑构造样式等3种类型。圈闭类型主要有背斜型圈闭、断鼻—断块型圈闭、地层圈闭和构造—岩性圈闭。长岭断陷主要受伸展构造样式控制，以断鼻、断块构造为主，该类圈闭多具有近源、断裂沟通烃源、纵向上多层圈闭继承发育的特点，成藏条件优越。

关键词: 松辽盆地, 长岭断陷, 构造演化, 构造样式, 圈闭类型