四川盆地周围,特别是川东,几乎都是大山区,地震勘探的地表条件十分复杂。几年来在这些地区获得的地震野外记录质量都较差,即使在处理上用了好多方法也难有一个根本的改善。而这些地区的构造倾角大, Around the Sichuan Basin, especially in eastern Sichuan, almost all large mountainous areas, the surface conditions of seismic exploration is very complicated. Seismic field records obtained in these areas over the years have been poorer in quality, and there is no fundamental improvement that can be achieved even with a great deal of processing. The structural dip in these areas is large,