充液管中的导波测量海底沉积物原位声速的方法研究  

Method for Measuring In-Situ Sound Velocity of Seafloor Sediments Using Guided Waves in Liquid Filled Tube

作　　者：张飞 张秀梅[2] 魏倩[2] 朱友生 ZHANG Fei;ZHANG Xiumei;WEI Qian;ZHU Yousheng(China National Offshore Oil Corporation,Fujian New Energy Limited,Fuzhou 350826,China;State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;Geophysical-China Oilfield Services Limited,Tianjin 300459,China)

机构地区：[1]中海油(福建)新能源有限公司,福建福州350826 [2]中国科学院声学研究所声场声信息国家重点实验室,北京100190 [3]中海油田服务股份有限公司,天津300459

出　　处：《海洋技术学报》2024年第3期53-62,共10页Journal of Ocean Technology

基　　金：中国海洋石油集团有限公司资助项目(CNOOC-KJGJHXJSGGYF2020-02);国家自然科学基金资助项目(12334019)。

摘　　要：海底沉积物原位声学参数是标定海底地层声场环境、开展多种海洋工程应用的关键参数之一。本文首先建立了充液管-地层物理模型中声波传播的有限差分算法,数值模拟并分析了管中接收声波的特征及其随沉积物速度的变化规律,着重分析了首波的传播特性随距离的变化特征;其次,在此基础上研制了可挂接于海底静力触探装置的实验样机及其核心部件,如声波发射和接收换能器及功能电路板等,搭建了实验测试平台并进行了相关的性能实验测试,对管外存在不同介质下管中激发产生的导波的声信号特征进行了对比和分析。理论和实测结果表明:充液管中导波的衰减特性受到沉积物声速的影响,该特性可用于反演测量地层的声速,实验测量的结果进一步论证了方法的可行性。The in-situ acoustic parameters of seafloor sediments are one of the key parameters for calibrating the acoustic field environment of the seafloor stratum and carrying out a variety of marine engineering applications.Firstly,the finite difference algorithm of acoustic wave propagation in the fluid-filled tube-sediment physical model was established,and the characteristics of the received acoustic wave in the tube and its variation rule with sediment velocity were numerically simulated and analyzed,focusing on the change of propagation properties of the first wave with distance;furthermore,the experimental prototype that can be hooked up with the seafloor Static Cone Penetration Test device and its core components,such as acoustic transmitter and receiver and functional circuit boards,etc.,were developed on this basis,and the experimental test platform and relevant performance experimental tests were carried out.The acoustic signal characteristics of the guided waves generated by the excitation in the tube under the presence of different media outside the tube were compared and analyzed.The theoretical and the measured results show that the attenuation characteristics of the guided wave in the fluid-filled tube are affected by the sound velocity of the sediment,which can be used to inversely measure the sound velocity of the stratum,and the experimental measurements further demonstrate the feasibility of the method.

关 键 词：海底沉积物 原位声速 导波 首波衰减 静力触探 

分 类 号：P756.5[天文地球—海洋科学] O429[理学—声学]