考虑道间时差相位的瑞雷波波速成像方法研究与应用  

Research and Application of Rayleigh Wave Velocity Imaging Method Considering of Arrival Time Difference Phase Between Channels

作　　者：蒋忠祥[1] 向旻[2] 孙进忠 孟盛向[1] 姚晓勇 张旭辉 Jiang Zhongxiang;Xiang Min;Sun Jinzhong;Meng Shengxiang;Yao Xiaoyong;Zhang Xuhui(Geophysical and chemical prospecting brigade of Xinjiang Bureau of Geology and mineral resources,Changji,Xinjiang,831100,China;Xinjiang Institute of Engineering,Urumqi,Xinjiang,830001,China;China University of Geosciences(Beijing),Beijing,100088,China)

机构地区：[1]新疆维吾尔自治区地质矿产勘查开发局地球物理化学探矿大队,新疆昌吉831100 [2]新疆工程学院,新疆乌鲁木齐830001 [3]中国地质大学(北京),北京100088

出　　处：《新疆地质》2023年第2期296-299,共4页Xinjiang Geology

摘　　要：现有瑞雷波勘探数据处理方法存在道间距限制、施工量大、水平分辨率低等问题。为解决这些问题,引入道间时差相位概念,对计算出的相位差进行补偿,使道间距在不受限制条件下,计算出瑞雷波相速度。首先利用小波变换对地震原始信号进行去噪;然后利用道间时差相位在时间域截取瑞雷波,计算出相邻地震道的真实相位差,获取两道之间的相速度-深度频散曲线;最后结合多道瑞雷波频散曲线,得到相速度-深度成像图。将本方法应用于工程勘察中的薄板状地质体探测,能准确反映探测目标空间分布位置。相对传统瑞雷波数据处理方法,本方法可突破道间距限制,减小施工量,同时具更高的横向分辨率。At present,Rayleigh wave exploration data processing has the problems of restricted trace interval,large construction volume and low horizontal resolution.In order to solve these problems,the concept of arrival time differ-ence phase between channels is introduced to compensate the calculated phase difference,so that the phase velocity of Rayleigh wave can be calculated without trace interval restriction.Firstly,wavelet transform is used to de-noise the origi-nal seismic signal;Then,the Rayleigh wave is intercepted in the time domain;The true phase differences of adjacent trac-es are calculated considering arrival time difference phases between channels,and the phase velocity-depth dispersion curve is obtained;Finally,combined with the multi-channel Rayleigh wave dispersion curve,the phase velocity-depth im-aging figures are obtained.This method is applied to the detection of weak geological bodies in engineering investiga-tion,it can correctly reflect the spatial distribution position of detection targets.Compared with the traditional Rayleigh wave data processing,this method can break the restriction of trace interval,reduce the construction volume,and have better horizontal resolution.

关 键 词：瑞雷波 小波变换 道间时差相位 波速成像 

分 类 号：P315.31[天文地球—地震学]