浅地层剖面资料解释中的陷阱问题分析  

PITFALLS IN INTERPRETATION OF SUBBOTTOM PROFILE DATA

作　　者：王方旗[1] 吕京福[1] 申宏[1] 董立峰[1] 宋玉鹏[1] 

机构地区：[1]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《物探与化探》2013年第6期1061-1066,共6页Geophysical and Geochemical Exploration

基　　金：国家海洋公益性行业科研专项(201005005);国家海洋公益性行业科研专项(201005010-01)

摘　　要：浅地层剖面仪是目前海洋工程勘察和海洋地质研究应用最为广泛的地球物理调查仪器之一,其地层探测分辨率越来越高,但实际获取的声学地层剖面资料在解释时会存在一些陷阱,值得引起注意。笔者从浅地层剖面仪的工作原理出发,分析了导致解释陷阱的4种情况:声学地层与地质地层的不同导致的陷阱、非自激自收导致的浅水区浅部地层厚度畸变、特殊反射界面在声学剖面上的空间变形和海底地层中声速变化造成的地层厚度失真,并对浅地层剖面资料处理和解释中如何预防和消除这些陷阱的影响进行了讨论。The subbottom profiler is one of the most widely used geophysical instruments for marine surveying and marine geological research. Although its vertical resolution becomes more and more high,there are some pitfalls in interpretation of the actual acoustic profile data. In this paper,based on the working principle of the subbottom profiler,the authors analyzed four factors causing the interpretation pitfalls. First,the understanding pitfall caused by the difference between acoustic layers and geological layers; Second,the shallow stratigraphic distortion caused by the horizontally separately placed transducer and hydrophone; Third,the spatial deformation of the acoustic interfaces in the data profiles reflected from special stratigraphic interfaces; The last,the layer thickness distortion caused by the change of the speed of acoustic wave propagation in marine sediments. The method concerning the elimination of these pitfalls during processing and interpreting the subbottom profile data is also discussed.

关 键 词：浅地层剖面 解释陷阱 声学界面 地层厚度 

分 类 号：P631.4[天文地球—地质矿产勘探]