【摘要】 在物理海洋学的研究中,利用CTD(Conductivity,Temperature and Depth sensors)测量方法研究海水温盐结构存在着获取数据时间长、数据横向精度低的缺点,而利用反射地震记录可以获得剖面上连续的水体温盐结构,弥补了传统方法的不足。反射地震方法研究海水温盐结构是个新的交叉学科方法,称为"地震海洋学"。由于海水水体的物性变化比地层物性变化小得多,造成海水水体的反射地震资料信噪比很低,各类干扰强烈,因而海水水体的反射地震资料处理也和常规地震资料处理方法有所不同。它处理的重点是振幅补偿,叠前去噪以及叠后处理。笔者通过对"十五"973项目在南海东北部采集的一条高分辨率多道反射地震测线的海水水体部分的地震数据进行处理,压制了强线性干扰波,获得了水体反射图像。地震叠加速度分析获取的3个CDP(Common Depth Point)的垂向速度从1540 m.s-1单调减小到1478 m.s-1,与CTD测量得到的速度变化趋势一致。更多还原

【Abstract】 CTD(Conductivity,Temperature and Depth sensors) method is usually used to study ocean thermohaline structure in physical oceanography research.There are some disadvantages on the method,such as spending too long time to acquire data and low transverse precision.A new cross-discipline method called "Seismic oceanography",which remedies the disadvantages of conventional CTD method,is introduced in this paper to study ocean thermohaline structure by muti-channel seismic profile.Since the variation of physical properties of seawater mass is much smaller than that of substrate layer,its seismic data are of low signal-to-noise ration due to strong interfering waves.As a result,the seismic data processing in oceanography is somewhat different from that in geology.The key processing procedures include amplitude compensation,pre-stack noise suppression and post-stack processing.In a processing test to a "973 Project" survey line run during the last 5-year plan in the northeastern South China Sea,shot-induced strong linear bubble interfering waves are suppressed and clear reflection images of seawater mass are obtained.The vertical velocities at the 3 CDP(Common Depth Point) sites obtained by stacking velocity analysis decrease monotonously from 1540 m·s-1 to 1438 m·s-1.The trend of velocity variation agrees well with CTD measurements.更多还原