浅层地震在薄层采空区探测技术研究实践  

Research on shallow seismic technology in the detection of underground thin goaf in urban

作　　者：曾爱平 彭慧芳 吴豪杰 丁亚进 刘国峰[2] ZENG AiPing;PENG HuiFang;WU HaoJie;DING YaJin;LIU GuoFeng(Geophysical Prospecting and Surveying Team of Shandong Bureau of Coal Geology,Jinan 250104,China;China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]山东省煤田地质局物探测量队,济南250104 [2]中国地质大学(北京),北京100083

出　　处：《地球物理学进展》2022年第6期2639-2647,共9页Progress in Geophysics

基　　金：山东省煤田地质局科研专项(鲁煤地科字(2019)12号)资助。

摘　　要：济南东部城市采空区是该地区城市化进程的隐患.由于采空区厚度在1 m左右,常规方式难于直接分辨.地震勘探因其具有高分辨率的优势被采用,但是同样因为分辨率问题,需对地震成像数据进行提频处理后进行采空区特征的识别.本文采用基于同步挤压小波变换高频重建方法和正演计算相结合的方式,就该区薄采空区在地震剖面上的特征进行了识别.在高频重建后的地震剖面上,采空区因为低速填充的存在,出现煤层反射下拉的现象.通过钻井验证,该方法在浅层薄煤层采空区识别中效果良好.本文方法直接、稳定,综合应用拓展了浅层地震在城市地下空间探测的应用领域,对济南东部采空区识别具有重要实践意义.The goaf in the eastern city of Jinan is a hidden danger in the process of urbanization in this area.Because the thickness of the goaf is about 1 meter,it is difficult to distinguish directly by conventional methods.Seismic exploration is used because of its high resolution advantage,but also because of the resolution problem,the seismic imaging data needs to be frequency-raised to identify the characteristics of goaf.In this paper,the combination of high-frequency reconstruction method based on synchrosqueezing wavelet transform and forward calculation are used to identify the characteristics of goaf on the seismic sections in this area.On the seismic sections after high-frequency reconstruction,the coal seam reflection wave is pulled down due to the existence of low-velocity filling in the goaf.Through drilling verification,the identification of goaf in shallow and thin coal seams is effective.The method in this paper is direct and stable,expands the application field of shallow seismic detection in urban underground space,and has important practical significance for the identification of mined-out areas in eastern Jinan.

关 键 词：采空区 同步挤压小波变换 浅层地震 城市地下空间 

分 类 号：P631[天文地球—地质矿产勘探]