含小断层煤层Rayleigh型槽波波场和频散分析  

Rayleigh channel wave field and dispersion of coal seams with small faults

作　　者：乔勇虎 滕吉文[2,3] 皮娇龙[2] QIAO YongHu;TENG JiWen;PI JiaoLong(Shanxi Normal University,Shanxi Linfen 041000,China;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Jilin University,Changchun 130026,China)

机构地区：[1]山西师范大学,山西临汾041000 [2]中国科学院地质与地球物理研究所,北京100029 [3]吉林大学,长春130026

出　　处：《地球物理学报》2018年第12期4976-4987,共12页Chinese Journal of Geophysics

基　　金：国家自然科学基金委重点项目(41130419)资助

摘　　要：煤层隐伏小断层在煤田地质勘探期间能否查明,是影响煤矿安全生产的主要地质因素.煤层中传播的地震槽波,非常适用于探测煤田异常构造.本文利用谱元法模拟计算了含断层模型Rayleigh型地震槽波的产生、传播过程,对于直达槽波、反射槽波、透射槽波进行了波场特征分析,频散特征分析,频谱特征分析.根据不同小落差断层模型(垂直断距分别为1/4、1/2、3/4、1个煤厚;断层倾角分别为90°、60°、45°),分析了Rayleigh型槽波传播过程中断层对反射槽波、透射槽波能量、频谱的影响效应.基于以上分析,对于小断层模型中的Rayleigh型地震槽波取得了一些规律性认识,并对Rayleigh型地震槽波的勘探应用做了一些探讨.Whether concealed small faults in coal seams can be found out during geological exploration is a main geological factor that affects the safety production of a coal mine.Seam Channel waves in coal seams are very suitable for detecting abnormal structures in a coal field,because they are characterized by strong energy,obvious dispersion and easy to identify.In this paper,we use the spectral element method to simulate 2D Rayleigh channel wave propagation in coal seams containing small faults,and analyze the characteristics of wave fields,dispersion and spectra of direct,reflected and transmitted channel waves.Based on different fault models with small throws(vertical offsets 1/4,1/2,3/4,one thickness of a coal seam;dips 90°,60°,and 45°),we address the influential effects of small faults on these waves.By virtue of the analysis above,we obtain some new insights into Rayleigh channel wave in coal seams with small faults,and discuss the application of such waves in exploration.

关 键 词：Rayleigh型槽波 谱元法 数值模拟 频散分析 小落差断层 

分 类 号：P631[天文地球—地质矿产勘探]