基于地震勘探的海洋工程地质勘察

Engineering geology survey in ocean based on high-resolution seismic exploration

海洋工程灾害荷载作用下的安全性成为当今海洋科学研究的重点内容之一。海洋工程的工程地质参数是海洋工程设计最基本的资料,本文的研究目的是探讨一种获取近海海洋工程的工程地质资料的简单、快捷的方法,以降低海洋工程地质勘察高费用,缩短获取资料的周期。本文采用的方法是利用获取的人工地震和天然地震信息应用波动方程方法来反演近海海洋工程所需的地层结构参数和相关的岩土力学参数。主要研究内容包括六个方面:1）海洋三维地震勘探的几个技术难点;2）利用小波变换技术的地震信息叠前处理优化算法;3）利用面波信息的近海海洋地层结构的波动方程反演算法和算法优化;4）利用P、S波信息的组成地层的岩土力学参数反演算法和算法优化。本文研究成果将大大减少近海海洋工程地质勘察的费用,缩短勘察周期,从而提高勘察的效益。

In order to ensure the safety of ocean engineering, the engineering geology survey, which is the sole way to provide maximum basic geological and geotechnical information for designing and building ocean engineering, is one of the important basic elements. The engineering geology survey in ocean based on high-resolution seismic exploration is a new and key question for study, and it is rapidly developed in recent years. The paper presents some key problems in high - resolution seismic exploration, which include the patterns of hypocenter, sampling technique, observation method, data transmitting technique, and signal processing techniques. In this paper, the Wavelet transform method is applied to eliminate noises in the prestack seismic data processing. A new reversion algorithm based on surface wave is put forward to identify the stratum structure. The key physical and mechanical parameters are inversed based on data of P or S wave.