声学地层剖面探测技术在金州湾人工岛场址勘察中的应用  

APPLICATION OF ACOUSTIC SUBBOTTOM PROFILING TECHNOLOGY TO PROSPECT THE SITE OF ARTIFICIAL ISLAND IN JINZHOU BAY

作　　者：王方旗[1] 吴永亭[1] 刘乐军[1] 胡光海[1] 董立峰[1] 陶常飞[1] 

机构地区：[1]国家海洋局第一海洋研究所青岛海洋工程勘察设计研究院,青岛266061

出　　处：《工程地质学报》2012年第5期841-848,共8页Journal of Engineering Geology

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：声学地层剖面探测是一种基于声学原理的连续走航式探测水下地层结构和构造的地球物理方法,由于其灵敏度和分辨率高、连续性好且能高效地探测水下地层的地质特征及其分布而在海洋工程勘察中得到了广泛应用。拟在渤海金州湾海域内建造一座人工岛,场址沉积的地层是自晚更新世以来伴随着海平面升降和海侵海退过程而逐渐形成的,自上而下依次为:浅海相淤泥或淤泥质粉质黏土、滨海相淤泥、陆相黏土、滨海相粉质黏土、海陆交互相黏土和粉质黏土。通过对典型声学地层剖面的综合分析和解释,识别出了8个连续的强声学反射界面,主要划定了具有沉积环境意义的6个声学层序,查明了"现代沉积层"的厚度分布和基岩面埋深状况等;并与工程地质钻孔的沉积地层岩性单元对比研究,发现依据声学地层剖面进行的地层划分与钻孔岩芯的地质地层划分有较好的对应关系,由此确定并推断了地层的沉积相。The acoustic subbottom profiling technology is a geophysical method based on acoustical principle to continuously detect underwater stratigraphic structure and tectonics. Because of its high sensitivity, resolution, con tinuity and the ability of efficiently detecting the characteristics and distributions of underwater geological forma tions, it has been widely used in marine engineering prospect. An artificial island will be built in the Jinzhou Bay, Bohai Sea, where the sedimentary are gradually formed with the eustatism and transgression or retreat process since late Pleistocene. From top to bottom,the soilstrata are as follows： neritic facies silt or silty clay, littoral facies silt, continental facies clay, littoral facies silty clay, interbedded of marine and continental facies clay and silty clay. The typical acoustic subbottom profiles from Jinzhou Bay, Bohai Sea are analyzed and interpreted. Eight continuous strong acoustic reflection interfaces are recognized, and six acoustic sequences which have depositional environmen tal significance are confirmed. The thickness distribution of modem sedimentary and the depth distribution of bed rock are analyzed. According to the comparative study with the sedimentary stratigraphic and lithologic units of theengineering geological drillings, there is a good correspondence between the acoustic sequences confirmed by the subbottom profile and the geological strata of the drilling core. Therefore, the depositional environment is also de duced.

关 键 词：声学地层剖面 反射界面 沉积层序 渤海金州湾 

分 类 号：P631.5[天文地球—地质矿产勘探]