伊通地堑边界断裂的性质与演化

与走滑有关的盆地一般比较复杂,其形成和演化主要取决于边界断裂的性质和活动演化历史。本文主要运用构造解析方法,综合地质、三维地震、遥感、重力和钻井资料,对伊通地堑边界断裂的性质和演化进行了详细的研究。结果表明,伊通地堑两边界断裂的性质和对盆地形成和演化的作用存在显著的差异,西北缘边界断裂是一走滑性质的断裂,始新世和渐新世分别表现为右旋张扭和右旋压扭作用,并对盆地的形成和演化起控制作用;东南缘边界断裂不同断段落性质存在差异,在盆地的形成和演化过程中起协调沉降的作用。新近纪都经受了WNW-ESE方向的挤压作用。 

THE PROPERTY AND EVOLUTION OF BOUNDARY FAULTS OF YITONG GRABEN

Basins related to strike-slip faults are relatively complex,and mainly controlled by the property and evolution of boundary faults.In this paper,with application of structural analysis technology,the property and evolution of boundary faults are analyzed with geological,3D seismic,remote sensing,gravity and drilling data.The result shows that there are great differences between the two boundary faults on the property and the influence on basin formation and evolution.The northwest boundary fault is a strike-slip fault,controlling the basin formation and evolution,and experienced right-lateral transtension and tranpression in Eocene and Oligocene respectively,while the property of southeast boundary fault is different in different section and there is accommodation effect on basin subsidence.Both two boundary faults experienced compression in NWW-SEE direction in Neogene.