基于环境噪声的地震响应重建方法及应用

发布时间：2018-02-14 19:18

本文关键词： 环境噪声被动源地震干涉虚源道集构建振幅规则化面波记录　出处：《石油物探》2017年06期 　论文类型：期刊论文

【摘要】：被动源地震干涉能够从环境噪声中重建有用的地震响应,如面波甚至体波,以用于建立地下速度模型。但由于环境噪声源具有随机分布的特征,记录混沌而杂乱无序,如何进行资料预处理并从中重建地震响应是一件具有挑战性的工作。为此,针对地表噪声源记录特点以及噪声源分布不均匀而导致重建因果格林函数与逆时格林函数不相等等问题,提出了振幅规则化和求和虚源道集构建方法,显著改善和增强了重构地震响应中的面波信号。利用高铁线附近采集的环境噪声数据,进行了地震响应重建试验,结果表明:振幅规则化和求和虚源道集构建方法能有效地从环境噪声中恢复直达波和面波响应,可进一步用于走时层析成像和面波反演以及近地表纵波和横波速度模型的建立。
[Abstract]:Passive source seismic interference can reconstruct useful seismic response from ambient noise, such as surface wave or body wave, to establish underground velocity model. How to preprocess data and reconstruct seismic response from it is a challenging task. In view of the characteristics of surface noise source records and the non-uniform distribution of noise sources resulting in the unequal reconstruction of causal Green's function and inverse Green's function, a method of amplitude regularization and summation of virtual source gathers is proposed. The surface wave signal in the reconstruction of seismic response is improved and enhanced significantly. Using the environmental noise data collected near the high-speed railway line, the seismic response reconstruction test is carried out. The results show that amplitude regularization and summation of virtual source gathers can effectively recover direct and surface wave responses from ambient noise, and can be further applied to travel time tomography and surface wave inversion, as well as the establishment of velocities models of near surface P-wave and S-wave.
【作者单位】：中国石油化工股份有限公司石油物探技术研究院;中国科学院地质与地球物理研究所;
【基金】：中国石化科技部项目(P13030)资助~~
【分类号】：P631.4

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