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.