浅海区C-Boom型浅地层剖面地层畸变及校正

Distortion and Correction of C-Boom Subbottom Profiles From the Shallow Sea Areas

浅地层剖面测量是海洋工程勘察、灾害地质调查和大陆架海洋地质科学研究的重要手段,资料解译的准确程度将对地质调查和研究成果的可靠性造成直接影响。由于C-Boom型浅地层剖面仪的发射换能器与水听器是分开安置的,当调查区域的水深过浅时,将其近似为自激自收的单道地震系统会导致地层的畸变,水深越浅地层畸变率越大。根据浅地层剖面仪的基本原理,推导出了C-Boom型浅地层剖面仪地层畸变率的计算公式及地层畸变校正公式,为用C-View软件更准确地解译此类浅地层剖面资料提供了参考。

Subbottom profile survey is an important means for marine engineering survey,hazardous geological investigation and continental shelf geological research.The accuracy of profile interpretation can directly influence the reliability of the results from geological investigations.Because the transducer and the hydrophone of the C-Boom Subbottom Profiler are mounted separately,stratum distortion can be caused if the profiler is seen as a self-excited and collected single-channel seismic system,particularly when water depth is very shallow in the surveying area,and the shallower the water depth,the greater the stratum distortion rate.According to the basic principle of the profiler,formula for calculating the stratum distortion rate and correcting the stratum distortion have been worked out for the C-Boom Subbottom Profiler,hence providing helpful references for using C-View software to interpret such profile data more accurately.