论文部分内容阅读
经高分辨率处理后的地震剖面展示了龙门山南段山前大邑地震勘探区的深部存在一隐伏的生长断层转折褶皱.对地震剖面的构造变形以及褶皱两翼生长前、生长期间和生长后地层的变形几何关系进行了详细的构造解析;利用断层转折褶皱几何变形的计算机模拟技术对大邑深部隐伏生长断层转折褶皱进行了不同沉积速率时几何变形过程的模拟,提取构造特征与实际地震反射剖面进行对比.研究结果表明,龙门山南段山前也存在印支晚期的低角度逆冲推覆过程,构造活动发生在须家河四段(T3x4)中上部沉积期间,与龙门山北段山前印支晚期的逆冲推覆过程相对应,但推覆位移量较北段小.
The high-resolution seismic section shows the presence of a concealed growth fault fold in the deep part of the Dayi area in the front of the Shanmen section of the southern Longmen Shan.The tectonic deformation of the seismic section and its growth before, during and after growth The deformation geometry of the strata was analyzed in detail. The geometric deformation process of deep buried volcanic growth fault in Dayi was simulated by computer simulation technique of fault fold deformation geometry. The structural characteristics and actual seismic reflection The results show that there is also the low-angle thrust nappe process in the late Indosinian in the front of the Longmenshan section, and the tectonic activity took place during the upper sedimentation of the fourth member of the Xujiahe Formation (T3x4) The piedmont thrusting process corresponds to the late Indosinian, but the thrusting displacement is smaller than the northern one.