CAJ | 학술논문

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。由于发收分置型浅地层剖面仪的激发装置与接收装置是分开的,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,推导出了浅部地层厚度畸变校正公式,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。海底沉积物的声速直接影响浅地层剖面地层厚度解译的准确性,利用卢博等建立的适用于中国东南近海的声速经验公式,在某人工岛构造调查中,根据地质钻孔获取的孔隙度参数计算各沉积层的平均声速,建立相应的声速结构剖面,对地层厚度进行校正,取得较好的效果,用孔隙度预测声速的方法参数容易获取,能够提高浅地层剖面资料的解译精度,使地层的厚度更接近于实际,具有一定的实用意义。
천지층부면측량시해양공정감찰、재해지질조사화대륙가해양지질과학연구적중요수단,자료해역적준학정도장대지질조사화연구성과적가고성조성직접영향。유우발수분치형천지층부면의적격발장치여접수장치시분개적,당조사구역적수심과천시,장기근사위자격자수적단도지진계통회도치지층적기변,수심월천지층기변솔월대。근거천지층부면의적기본원리,추도출료천부지층후도기변교정공식,위용C-View연건경준학지해역차류천지층부면자료제공료삼고。해저침적물적성속직접영향천지층부면지층후도해역적준학성,이용로박등건립적괄용우중국동남근해적성속경험공식,재모인공도구조조사중,근거지질찬공획취적공극도삼수계산각침적층적평균성속,건립상응적성속결구부면,대지층후도진행교정,취득교호적효과,용공극도예측성속적방법삼수용역획취,능구제고천지층부면자료적해역정도,사지층적후도경접근우실제,구유일정적실용의의。
The subbottom profiling is an important means of marine engineering survey, hazardous geology study and continental shelf scientific research. The accuracy of subbottom profile data interpretation has a direct impact on the research and investigation results. Because some of profilers’ transducer and hydrophone are separately installed, when the survey area is very shallow, distortion of shallow layers will be caused if it is seen as a self-excited and self-collected single-channel seismic system. According to the principle of subbottom profiler, the distortion correction formula is deduced and analyzed, providing actual value to using C-View software to interpret such subbottom profile data more accurately. In addition, the seabed sediments sound velocity is one of the key parameters when acquiring and processing the subbottom profile data. On the basis of comparing some sound velocity forecasting empirical equations, the LU Bo’s equation was considered the most appropriate to predict the seabed sediments, sound velocity at near-shore of China. In a survey of an artificial island site, the LU Bo’s equation and the porosity data obtained from geological drilling were utilized to predict the sediments sound velocity, and the sound velocity structure profile was plotted, which was applied in processing the subbottom profile data of the artificial island investigation. The method of using porosity data to predict sediments sound velocity in processing subbottom profile data can improve the interpretation accuracy and it’s of practical significance.