音频大地电磁法对隐伏溶洞识别效果的探讨  

Discussion on the Effect of Audio Magnetotelluric Method on the Identification of Hidden Karst Caves

作　　者：张德实[1,2] 何帅 杨炳南[1,2,3] 沈小庆 ZHANG De-shi;HE Shuai;YANG Bin-nan;SHEN Xiao-qing(103 Geological Party,Guichou Bureau of Geology&Mineral Exploration and Development,Tongren 554300,Guizhou China;Engineering Technology Innovation Center of Mineral Resources Explorations in Bedrock Zones,Ministry of Natural Resources,Guiyang 550081,Guichou,China;Guizhou Prouince Manganese Ore Resources Forecasting and Evaluation Technology Innovation Talent Team,Tongren 554300,Guizhou,China)

机构地区：[1]贵州省地矿局103地质大队,贵州铜仁554300 [2]自然资源部基岩区矿产资源勘查工程技术创新中心,贵州贵阳550081 [3]贵州省锰矿资源预测评价科技创新人才团队,贵州铜仁554300

出　　处：《贵州地质》2023年第1期72-77,共6页Guizhou Geology

基　　金：黔科中引地[2021]4027;黔科合支撑[2023]一般172;黔科合支撑[2019]2868联合资助。

摘　　要：为研究音频大地电磁法对隐伏溶洞的识别效果,针对无充填、半充填、全充填三种溶洞模型,分别采用Bostick和Occam TE、TM、TE+TM三种模式进行一维反演,将一维反演结果作为初始模型进行正则化二维NLGG反演,将二维反演成果图与溶洞地质模型进行对比分析研究,在其基础上筛选出最能反映不同溶洞模型形态的优选反演组合方式。将研究成果应用于松桃县黔龙洞进行验证,结果反演剖面圈定的溶洞异常与溶洞实际位置、埋深、规模等特征具有较好对应关系,证明音频大地电磁法对隐伏溶洞的识别能力较强。研究成果对岩溶区隐伏溶洞的勘查具有借鉴意义。In order to study the detection and identification effect of audio magnetotelluric method(AMT)on hidden caves,three cave models of no filling,half filling and full filling were established,and three models of Bostick and Occam TE,TM and TE+TM were selected for one-dimensional inversion.The one-dimensional inversion results are used as the initial model for regularized two-dimensional NLGG inversion,and the two-dimensional inversion results are compared and analyzed with the cave geological model,and the optimal inversion that can best reflect the shape of different cave models is selected.combination.Taking the measured section of Qianlong Cave in Songtao County as an example,the optimal inversion combination method closest to the karst cave model was selected for inversion and comparative analysis.It has a good corresponding relationship,which proves that audio magnetotelluric detection can identify hidden karst caves and provide valuable geophysical evidence.

关 键 词：隐伏溶洞 音频大地电磁法 模型 二维反演 

分 类 号：P631.2[天文地球—地质矿产勘探] P588.245[天文地球—地质学]