松辽盆地南部中央坳陷区正反转构造特征及演化机制

松辽盆地南部中央坳陷区已发现了１０多个油田及上百个油气藏，该区伴有大量的“下正上逆”的反转断层，且上盘发育有反转背斜。在分析大量地震资料的基础之上，结合区域构造演化特点，对中央坳陷区的正反转构造进行了研究。结果表明，松辽盆地南部中央坳陷区的正反转构造平面分布及延伸具有方向性及成带的特点。构造类型发育有穿透断展型、简单断展型、上盘褶皱型、下盘褶皱型和滑脱褶皱型，变型程度依次变弱。反转构造变形程度与油气藏有密切关系，反转构造变形越弱及构造类型越简单，油气保存条件越好。

EVOLUTION MECHANISM AND CHARACTERISTICS OF POSITIVE INVERSION STRUCTURES IN THE CENTRAL DEPRESSION AT THE SOUTH OF SONGLIAO BASIN

The central depression is a main tectonic unit of Songliao basin. Over ten oilfields and a hundred oil gas pools have been found at the south of Songliao Basin, Jilin Province. There exists a lot of accompanying inversion folds developed on the hanging wall of these faults. The structural styles and characteristics of the inversion structures in the central depression at the south of Songliao Basin were analyzed by studying the evolutionary history. The study result shows that the distribution and extention in the plane of the positive inversion structures are characterized by certain directions and belt generation. The types of the inversion structures include penetrating fault, simple fault, hanging wall fold, lower wall fold and glide fold. The changeable degrees of the types are reduced gradually. The inversion structures are related to oil gas reservoirs.