极浅海水区浅地层剖面浅层失真及校正

浅地层剖面调查是进行大陆架第四纪地质研究，浅海灾害地质研究和工程地的南调查的重要手段，剖面的质量与解释精度将对研究成果的可靠性造成直接影响。由于浅地层剖面系统的震源与水听器有一定的距离，因此它只是近似的垂直发射垂直的接收单道地震系统，当水深地了浅时造成了剖面浅层的失真，导致各层位的反射时间延迟，层与层之间双程走时缩短，计算出的层速度偏高，在地形起伏较大的区域，将造成地形失真，在潮差大的区域，计算出

SKEWNESS AND CORRECTION METHOD OF THE SUBBOTTOM PROFILE FROM VERY SHALLOW SEA WATER ZONE

Subbottom profiling is an important method of continental-shelf Quaternary geolo-gy,hazardous geology and engineering geology. The quality of a profile and the correct-ness interpretation can directly influence reliability of study results.The subbottom pro-file system is only a close-to single-track system that vertically emits and receives sig-nals,as there is some distance between hydrophone and seismic source.Too shallow wa-ter can lead to skewness of a profile due to delay of reflection time from horizons,short-ening of travelling time from one horizon to another,too big the interval velocity calcu-lated and rough relief.And meeting points of a profile cannot close if the profiling isdone in an area where tidal range is big. So,correction of subbottom profiles acquired atshallow sea water is very necessary.