Abstract：Borehole TEM is widely used in deep prospecting and has achieved fruitful results;nevertheless, qualitative and semi-quantitative interpretation is mainly used in borehole TEM data Interpretation at present, which restrictes the use and popularization of this method to a large extent. In view of this situation, the authors studied pure anomaly inversion of TEM based on current filament by using genetic algorithm.With this method, we can accurately determine the size, dip and center coordinates of the in-hole or off-hole abnormal body.The inversion results of sheet model forwarded by Maxwell software and measured data further prove the correctness and applicability of the algorithm.
[1] 蒋邦远.实用近区磁源瞬变电磁法勘探[J].北京:地质出版社,1998.[2] 胡平,石中英.地井TEM工作方法及解释技术研究成果报告.地质矿产部"八五"科技攻关项目研究成果报告,1995.[3] 胡平.地井瞬变电磁法(TEM)方法技术手册.地质矿产部"八五"科技攻关项目研究成果报告,1995.[4] Mutton A J.Applications of downhole SIROTEM surveys in the agnew Nickel Belt,WA[J].Exploration Geophysics,1987,18(3):295-303.[5] Bishop J R,Lewis R J G,Macnae J C.Down-Hole electromagnetic surveys at Renison Bell,Tasmania[J].Exploration Geophysics,1987.[6] Irvine R J.Drillhole TEM surveys at Thalanga,Queensland[J].Exploration Geophysics,1987.[7] Lane R J L.The downhole EM rsponse of an itersected mssive slphide dposit,South Australia[J].Exploration Geophysics,1987.[8] Eadie T.The downhole EM rsponse of the hellyer ore deposit[J].Exploration Geophysics,1987.[9] Hughes N A,William R.Ravenhurst,three component DHEM surveying at Balcooma[J].Exploration Geophysics,1996.[10] Elders J,Wellington A.An application of reverse coupling to increase signal strength beneath conductive sediments-Miitel Mine,Kambalda,W.A.[J].Exploration Geophysics,1998.[11] 崔霖沛,吴其斌,等.寻找以铜为主的隐伏矿床的物探方法[M].地质矿产信息研究成果:三十,1994.[12] 国土资源部信息中心.国外重要成矿区带典型找矿案例和勘查技术应用[M].1999.[13] 施俊法,姚华军,李友枝,等.信息找矿战略与勘查百例[M].地质出版社,2005.[14] Woods D V.A model study of the crone borehole pulse electromagnetic (PEM) system.Kingston:Queen's University,1975.[15] Dyck A V,West G F.The role of simple computer models in interpretation of wide-band,drill-hole electromagnetic surveys in mineral exploration[J].Geophysics,1984,49:957-980.[16] 吴凤翔.瞬变场法研究."七五"国家重点科技攻关项目第55项子专题研究报告,1990[17] 张杰,吕国印,赵敬洗,等.地—井TEM向量交会技术的实现和应用效果[J].物探化探技术技术, 2007(S1):162-165.[18] Barnett C T.Simple inversion of time-domain electromagnetic data[J].Geophysics,1984,49:925-933.[19] Fullagar P K.Inversion of down-hole TEM data using circular current filaments[J].Exploration Geophysics,1987,18:872-888.[20] Nabighian M N.Quasi-static transient response of a conducting half-space-An approxi-mate representation[J].Geophysics,1979.[21] Keating P B,Crossley D J.The inversion of time-domain airborne electromagnetic data using the plate model[J].Geophysics,1990,55:705-711.[22] 米萨克纳比吉安.勘查地球物理电磁法:第一卷[M].赵经祥等译.北京:地质出版社,1992.
