华北盆地是我国东部的一个大型新生代裂谷盆地.它在中生代以前是一个稳定的大陆地块,在新生代期间经历了几次重要的断裂和沉降阶段.许多研究(例如文献[1,2])结果表明,华北盆地的伸展构造有与美国Basin和Range地区相类似的特征:盆地由一系列地堑和地垒组成,其中的断陷盆地大多为半地堑,一侧为高或中等角度的面状(或铲形)正断层,另一侧为沉积超覆.这一重要结论来自石油勘探的反射地震剖面.然而,石油勘探反射剖面一般只 The North China Basin is a large Cenozoic rift basin in eastern China that was a stable continental mass before the Mesozoic and experienced several important stages of fracture and subsidence during the Cenozoic. Many studies (eg, [1,2 ]) The results show that the extension structure of the North China Basin has features similar to those of the Basin and Range in the United States. The basin consists of a series of graben and basement, most of which are semi-graben, high or medium side (Or shovel-shaped) normal faults on the other side, and the other side is overlying and depositional.The important conclusion comes from the reflected seismic profiles of petroleum exploration.However, generally only