半航空瞬变电磁一维聚焦反演研究  

One-dimensional focusing inversion of the semi-airborne transient electromagnetic method and its application

作　　者：王仕兴 何可 尹小康[1] 魏栋华[1] 赵思为[1] 郭明 WANG Shi-Xing;HE Ke;YIN Xiao-Kang;WEI Dong-Hua;ZHAO Si-Wei;GUO Ming(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;Education Information Technology Center,West China Normal University,Nanchong 637002,China;College of Geophysics,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]中国中铁二院工程集团有限责任公司,四川成都610031 [2]西华师范大学教育信息技术中心,四川南充637002 [3]成都理工大学地球物理学院,四川成都610059

出　　处：《物探与化探》2023年第2期410-419,共10页Geophysical and Geochemical Exploration

基　　金：中国中铁股份有限公司科技研究开发计划(CZ01-重点-05)。

摘　　要：半航空瞬变电磁法(SATEM)是一种采用地面发射—空中接收的新兴地球物理勘探方法,具有灵活、高效的特点。目前应用于SATEM的反演方法往往基于最大平滑准则,使反演结果较平滑,无法较好地识别具体的层界面信息。本文将聚焦反演理论引入到半航空瞬变电磁一维反演中,通过选择合适的聚焦因子和正则化因子来确定聚焦反演稳定器,然后对包含聚焦反演稳定器反演目标函数进行求解,使得反演结果更能清晰识别层状地层突变的界面。设置多个层状地电模型验证聚焦反演的可靠性,同时与Occam反演结果进行对比,突出了聚焦反演识别界面的优势。对某地区地下水探测的实际数据进行聚焦反演计算,与水文地质资料、测井信息进行综合分析,查明了该区域地下含水层的位置及其空间展布情况,同时验证了半航空瞬变电磁对地下水探测的可行性。The semi-airborne transient electromagnetic method(SATEM)is an emerging flexible and efficient geophysical exploration method using ground launch and air reception.The present inversion methods applied to the SATEM produce very smooth inversion results since they apply the maximum smoothing criterion,thus failing to effectively identify the information of specific layer interfaces.This study introduced the focusing inversion theory to the one-dimensional inversion of the SATEM.First,a focusing inversion stabilizer was determined by selecting appropriate focusing and regularization factors.Then,the inversion objective function including the focusing inversion stabilizer was solved to allow the inversion results to effectively identify the abrupt interfaces of layered strata.Furthermore,multiple layered geoelectric models were built to verify the reliability of the focusing inversion.Moreover,the focusing inversion results were compared with the Occam inversion results to highlight the advantages of the focusing inversion in interface identification.This study conducted the focusing inversion calculation of actual data on groundwater detection of a certain area.The calculation results were then combined with the hydrogeological and logging data for comprehensive analysis.Finally,this study determined the locations and spatial distribution of underground aquifers in the area,verifying the feasibility of the SATEM for groundwater detection.

关 键 词：半航空瞬变电磁法 聚焦反演 地下水探测 

分 类 号：P631[天文地球—地质矿产勘探]