深拖式多道高分辨率地震探测系统在南海首次应用

自主研发的深拖式多道高分辨率地震探测系统（Kuiyang-ST2000）主要由高声源级、宽频带的等离子体电火花震源和48道（道间距为3.125m）数字零浮力拖缆组成，最大作业深度可达2000m。系统采集作业时将震源及接收缆同时拖曳于近海底（小于100m），缩短与被探测目标的距离，降低地震信号在传播过程中因海水吸收导致的衰减，且能克服海面拖曳勘探方式中多次波、气泡效应、海洋噪声等不利因素的影响。应用Kuiyang-ST2000系统在中国南海E海域进行了首次实际采集试验（工区海底深度约1500m，系统作业深度约1400m），所得海试数据具有较高信噪比，经精细处理后的最终成像剖面具有很高垂向、横向分辨率，验证了Kuiyang-ST2000系统的优越性，且弥补了海上常规多道地震探测系统分辨率不足的缺点。

A new deep-towed,multi-channel high-resolution seismic system and its preliminary application in the South China Sea

The proprietary deep-towed,multi-channel high-resolution seismic system (Kuiyang-ST2000)consisting of a plasma electric spark source with the advantages of high sound source level，wide frequency band，and multichannel receiver array(48 channel，interval 3.125m) is capable of operating at 2000m in ocean.During operating,the source and the receiving cable are towed to the offshore floor (less than 100m).This shortens the distance between the system and the detected target,reduces the absorption and attenuation of seawater during the propagation of seismic signals,and can overcome multiples,bubbles and ocean noises caused by towing streamers on sea surface.The first test on the ST2000 system was completed in the E sea area of the South China Sea (the regional sea floor is about 1500m deep,and the system working depth is about 1400m).The final imaging profile after fine processing of test data has verified the superiority of the Kuiyang-ST2000 system,which overcomes the shortcomings of insufficient resolution of conventional marine multi-channel seismic systems.