基于层状大地响应的异常场提取与载流环地-井TEM反演技术  

Anomalous field extraction based on layered earth response and filament inversion technique of borehole TEM

作　　者：杨毅[1,2,3] 智庆全 邓晓红[1,2] 王丽研 张杰[1,2] 武军杰 王兴春 YANG Yi;ZHI Qing-quan;DENG Xiao-hong;Wang Li-yan;ZHANG Jie;WU Jun-jie;WANG Xing-chun(The Institute of Geophysical and Geochemical Exploration,Hebei Langfang 065000,China;Electromagnetic Detection Technology Key Laboratory of Ministry of Land and Resources,Hebei Langfang 065000,China;Chengdu University of Technology,Chengdu 610059,China;Tianjin Geothermal Exploration and Development Designing lnstitue,Tianfin 300250,China)

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [2]国土资源部地球物理电磁法探测技术重点实验室,河北廊坊065000 [3]成都理工大学,成都610059 [4]天津地热勘查开发设计院,天津300250

出　　处：《地球物理学进展》2018年第5期2048-2055,共8页Progress in Geophysics

基　　金：国家重点研发计划项目"华北克拉通辽东/胶东重要成矿区带金多金属矿深部预测及勘查示范"下设课题"空-地-井立体探测技术方法构建与示范"(2018YFC0603803);物化探所基本科研业务费项目"地-井TEM人机交互式反演研究"(AS2017J07)和"适用于城市周边水域的TEM方法技术预研究"(AS2015J11)联合资助

摘　　要：基于等效载流环的异常场反演是一种地-井瞬变电磁快速反演方法,通过等效电流环能够迅速对井中TEM数据进行处理解释,给出异常的中心位置和空间展布,但是等效载流环只能对异常场进行反演,而实测数据中往往包含较强的背景场信息,造成了等效载流环反演难以直接应用于实测数据的反演解释,针对这一实际问题提出了采用层状大地响应来模拟背景场,通过"差值法"从实测数据中减去背景场的方法实现异常场提取,结合等效载流环技术完成异常场反演,最终实现地-井TEM数据的快速定量反演解释.Anomalous inversion method based on equivalent current is a fast borehole transient electromagnetic inversion method.According to the equivalent current,wo can can quickly accomplish borehole TEM data processing and interpretation,getting the center position and spatial distribution of anomaly. However,the equivalent current carrying only for anomalous field inversion,the measured data are contains strong background information,resulting the filaments inversion is difficult to be applied to real data inversion.In view of this practical problem,we extract anomalies through the＂difference＂from the measured data by subtracting the background field which used the layered earth to simulate,combined with the filaments inversion technology,finally,achieved the borehole TEM data rapid quantitative interpretation at last.

关 键 词：等效电流环 层状大地正演 背景场 异常场 反演 

分 类 号：P631[天文地球—地质矿产勘探]