上海近岸浅海单道地震多次波特征及压制方法研究  

The characteristics and suppression method of multiple waves in the high resolution single channel seismic system in the offshore Shanghai area

作　　者：刘伍[1] 司永峰[1] 王治华[1] 王远[1] 廖文新[1] 曾来[1] 王正霞[1] 

机构地区：[1]上海市地质调查研究院,上海200072

出　　处：《上海国土资源》2016年第2期89-95,共7页Shanghai Land & Resources

基　　金：中国地质调查局国家海洋保障工程工作项目"长江三角洲海岸带综合地质调查与监测"(GZH201200506)

摘　　要：为保障上海城市和海岸工程安全,为未来城市规划提供基础资料,近年来在上海近岸海域开展了大量地质调查工作,而单道地震以其分辨率高、探测实施快速方便成为海底地质结构调查的主要手段。上海近岸海域由于具有水浅、硬砂底质分布广等特点,单道地震探测数据中多次波比较发育,严重降低了单道地震的信噪比和分辨率。本文对上海近岸海域常见的多次波特征进行了分析总结,在此基础对预测反褶积法和模型拟合法压制高分辨率单道地震中的多次波的参数选择及有效性进行了研究,实践证明两种方法在合适的参数选择下能显著地压制单道地震中的多次波干扰,可大大提高单道地震探测的数据质量。In recent years, we have conducted signiifcant geological survey work in the offshore Shanghai area in order to provide data to engineers to ensure safety in the city and coastal areas. A high resolution single channel seismic system has become the main approach for detecting the stratum structure under the seabed because of its high resolution and convenience. Due to the shal ow water and the hard sandy seabed, multiple waves are generated in most regions, which reduce the S/N ratio and the resolution of the seismic data. This study summarizes the characteristics of the multiple waves in the single channel seismic data in the offshore Shanghai area. Based on these characteristics, we researched the preferred methods and the validity of the predictive deconvolution and model-iftting methods. Practice shows that the methods can suppress the multiple waves markedly and improve the seismic data quality greatly by using the correct numerical methods.

关 键 词：近岸海域 地球物理探测 高分辨率单道地震 多次波压制 预测反褶积法 模型拟合法 

分 类 号：P631.4[天文地球—地质矿产勘探]