双向多偏移距及同步挤压变换在岩溶地层地震映像资料处理中的应用研究  

Application of bidirectional multi-offset and synchrosqueezing transform in seismic image data processing of karst strata

作　　者：张伟 杜兴忠 李永铭 ZHANG Wei;DU Xingzhong;LI Yongmin(Power China Guiyang Engineering Corporation Ltmited.,Guiyang 550081,China)

机构地区：[1]中国电建集团贵阳勘测设计研究院有限公司,贵阳550081

出　　处：《物探化探计算技术》2022年第2期165-171,共7页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：贵州省科技计划项目(黔科合支撑[2018]2814)。

摘　　要：隐蔽岩溶岩洞对城市地下交通建设施工造成严重影响,厘清岩溶分布常用的地球物理方法之一是地震映像法。地震映像法常采用的单偏移距或多偏移距观测系统,能够较好识别地质结构简单的不良地质体,但针对岩溶发育不规则的喀斯特地区,常规方法难以获得“最佳”效果,提出双向多偏移距地震映像观测系统来提高地震映像勘探精度,并将同步挤压变换应用于地震映像数据处理中,获得了高精度的时频能量分布图像来识别岩溶发育区域。选取某城市轨道交通岩溶较为发育地段开展试验研究,地震异常图在位置、规模等特征分布明显,其中钻遇岩溶发育的2号钻孔与地震异常具有很好的一致性,表明这是一种可行、有效地识别不规则岩溶地层的方法。Hidden karst caves have a serious impact on urban underground traffic construction.One of the common geophysical methods to clarify karst distribution is seismic imaging method.The seismic imaging method often adopts single offset or multi-offset observation system,which can better solve the identification of adverse geological bodies with simple geological structure.However,for karst areas with irregular karst development,it is difficult to obtain the"best"effect by conventional observation system.A bidirectional multi-offset seismic imaging observation system is proposed to improve the accuracy of seismic imging exploration.The synchrosqueezing transform is applied to seismic image data processing,and then a high-precision time-frequency energy distribution image is obtained to identify the karst area.The experimental study is carried out in a section with relatively developed karst in an urban rail transition.The seismic anomaly map has obvious characteristics in location and scale.Among them,two wells drilled with karst have good consistency with the seismic anomaly,showing that it is a feasible and effective method to identify irregular karst strata.

关 键 词：双向多偏移距 地震映像 同步挤压 岩溶地层 

分 类 号：P631.4[天文地球—地质矿产勘探]