被动源面波和体波成像在内蒙古浅覆盖区勘探应用  

Surface wave and body wave imaging of passive seismic exploration in shallow coverage area application of Inner Mongolia

作　　者：刘国峰[1] 刘语 孟小红[1] 刘澜波[2] 苏维俊 王永志 张致付[1] LIU GuoFeng;LIU Yu;MENG XiaoHong;LIU LanBo;SU WeiJun;WANG YongZhi;ZHANG ZhiFu(School of Geophysics and Information Technology,China University of Geosciences(Beijing),Beijing 100083,China;Department of Geology,University of Connecticut,06269,USA;College of Geo-Exploration Science and Technology,Jilin University,Changchun 130061,China)

机构地区：[1]中国地质大学(北京)地球物理与信息技术学院,北京100083 [2]美国康涅狄格大学地质系,美国康涅狄格州062693 [3]吉林大学地球探测科学与技术学院,长春130061

出　　处：《地球物理学报》2021年第3期937-948,共12页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目“浅覆盖区岩浆热液型矿产勘查地球物理响应研究”(41974161)和“被动源地震勘探反射波成像及其在闽西南矿区立体探测中的应用”(42074131)共同资助

摘　　要：地震勘探具有勘探深度和分辨率的优势,在矿产勘探中多被采用.但主动源反射地震具有成本高、在矿区采集困难等难题,限制了其广泛应用.无需主动源激发、利用天然噪声的被动源地震应用于勘探,可成为其低成本替代选项.本文在内蒙古浅覆盖区矿区进行了被动源勘探试验,采用相关计算获得拟炮集记录,并基于频率域信噪比计算,在生成拟炮集前实现了面波和体波甄选,分离了面波和体波.应用面波反演的横波速剖面识别了覆盖层厚度.体波数据经反射波常规处理,获得了成像剖面.经与主动源反射剖面对比,主要结构的反射特征呈现了良好的一致性.本文试验验证了被动源勘探在内蒙浅覆盖区具有良好应用前景,为低成本的面积性勘探实施提供了新的选择.Seismic exploration has the advantages of exploration depth and resolution,and is mostly used in mineral exploration.Active source reflection seismic method has problems such as high cost and difficulty to data acquisition in mining areas,limiting their widespread application.Passive source seismic,which do not require active source excitation,can be used as a low-cost alternative to seismic exploration.Taking the exploration of shallow coverage in Inner Mongolia as an example,this paper introduces the application framework of passive source seismic exploration in the field of exploration with virtual-shot gathers generation plus data processing.In this paper a method of surface and body wave separation based on the frequency-domain signal-to-noise ratio.Before the process of generating virtual-shot records,surface and body waves are separated.Surface wave is used to invert the shear wave velocity,and thickness of the cover layer is picked from it.Body wave data is routinely processed as the reflection wave,and its imaging profile was in good agreement with the active source seismic results in the main reflections.This experiment demonstrates the potential usage of seismic applications for passive source exploration.

关 键 词：被动源地震 天然噪声 拟炮集记录 面波反演 反射波成像 

分 类 号：P631[天文地球—地质矿产勘探]