四川盆地北部构造特征及盆山耦合分析

Structural feature and basin-mountain coupling analysis of North Sichuan Basin

四川盆地北部受东北部大巴山和西北部龙门山的逆冲推覆作用,其地质构造相当复杂。通过对大巴山横向构造式样、剖面构造式样、龙门山地面构造、地腹构造特征分析,总结了四川盆地北部地区的基本构造特征。在构造运动、陆源碎屑物源及沉积充填特征等分析基础上,对龙门山造山带与龙门山前陆盆地盆山耦合关系进行了研究。得出了龙门山及其前陆盆地存在良好的耦合关系。对深入认识四川盆地构造与油气分布规律具有重要意义。

North Sichuan Basin is structurally very complicated as affected by the thrust napping effect of the Da- ba Mountain in the northeast and the Longmen Mountain in the northwest of Sichuan Basin.Basic structural fea- tures in North Sichuan Basin are generalized through analysis of the lateral and vertical structural style of the Da- ha Mountain,and the surface and subsurface structure of the Longmen Mountain.The basin - mountain coupling relationship of Longmen orogenic belt and foreland basin is studied based on analysis of tectonic movement,land clastic sources and fill characteristics.It is found that there exists a good coupling relationship between Longmen Mountain and its foreland basin.This is of important meaning to deep understanding of the structure of Sichuan Basin and oil and gas distribution.