Abstract: The 2D seismic method was applied in 2008 for geological survey on loose sediments in Nantong,Jiangsu Province,China with the seismic survey line about 20km long.The application indicates that the 2D seismic method can reflect intuitively the distribution characteristic of sediments stratum.5 layers are revealed and can be contrasted clearly with wave groups.By analysing the continiuty of waves,the speculated Yangtze River fault(F1) is validated,and other 5 faults and 1ancient river valley are displayed also.In the mean time,the 2D seismic method has very good effect on displaying the rock base of this area and some hidden hills in Xiaohai town.The results indicate that the 2D seismic method can be taken in some regional geological survey in the deep sediments covered area.

Key words: 2D seismic method, loose sediments, Yangtze River Fault, regional geological survey

摘要： 通过二维地震勘探方法在南通地区松散沉积层中的运用,发现了5个较明显的反射波组,可与地层中的5个沉积界面较好地对应,对区内松散沉积层的展布有了较直观的揭示。根据对波组连续性的分析,揭示了5条断裂及一些古河谷的存在,并对以往推测的可能存在的长江沿江断裂有了进一步的验证。二维地震勘探方法对区内基底的揭示效果也很好,发现在小海镇一带有较明显的潜山存在。结果表明,在松散层深覆盖区运用二维地震勘探方法完成区域地质调查的一些任务是可行的。

关键词: 二维地震, 松散沉积层, 长江断裂, 区域地质