城市浅层地震勘探过障碍变观设计

摘要

在城市浅层地震勘探数据采集中,地震测线经常会遇到河流、桥、交叉路口等地表障碍.为了尽量减小地表障碍造成的影响,需要对观测系统作变观设计.作者分析总结了城市浅层地震勘探中常见障碍以及过障碍变观模式,并开发了浅层地震过障碍变观设计软件,利用此软件可在采集现场快捷地进行过障碍变观.将这种方法应用于实际工作中,有效减小了资料缺失造成的影响,提高了资料的信噪比.该软件能够根据实际工作环境和设备条件在野外现场对观测系统进行灵活变观,设计出合理的过障碍观测系统,有效地提高了变观设计的效率.%In urban shallow seismic data acquisition,the seismic line often encounters the surface obstacles such as rivers,bridges,crossroads,and etc.To decrease the influence of these surface obstacles,the survey geometry is needed to be changed.After summarizing and analyzing common obstacle types and obstacle-crossing geometry,the authors develop a shallow seismic obstacle-crossing geometry-variable design software.In the field this software can be used to design obstacle-crossing geometry quickly and easily.By applying this method in the practice,the result shows that the obstacle-crossing geometry designed by the software improves the quality of seismic section and increases the ratio of signal to noise effectively.We conclude that the shallow seismic obstacle-crossing geometry-variable design software is helpful in flexibly designing obstacle-crossing geometry on the basis of field conditions and equipment,thus is capable of improving the efficiency of geometry-variable design for data acquisition.