辽河盆地中央凸起南部海外河地区构造演化特征

摘要：根据走滑作用的强弱，将盆地内沉积分为后走滑层序、同走滑层序和前走滑层序。后走滑层序受走滑活动影响可以忽略，按照一般的平衡方法进行恢复；同走滑层序和前走滑程序可根据断层两侧厚度趋势分别给予补偿，使断层两侧断距经补偿恢复协调后按一般的平衡方法进行恢复。通过海外河地区走滑盆地定量平衡恢复，获得了该地区中-新生代构造演化过程的直观认识。从中生代开始伸展裂陷，新生代进一步张裂并发展成为大型的裂谷型盆地。沙河街组一段、二段沉积时期开始逐渐遭到NE向右行走滑改造，东营组沉积后盆地再次遭受较为强烈的剥蚀，基本结束了盆地的伸展裂陷历史。最后综合海外河地区石油地质特征，探讨了海外河地区油气成藏模式及下一步重点勘探研究方向。

Characteristics of structural evolution in Haiwaihe area,the southern part of the Central Salient in the Liaohe Basin

Sedimentary system in the Liaohe Basin could be divided into pre-strike-slip sequence,syn-strike-slip sequence,and post-strike-slip sequence according to the strength of strike-slip activities.The post-strike-slip sequence,which was slightly influenced by the strike-slip activities,could be restored by traditional methods of balanced cross-section.By contrast,the syn-and pre-strike-slip sequences,significantly controlled and in-fluenced by the strike-slip activities,have to be restored with different thickn...