CAJ | 학술논문

多道瞬变电磁法(MTEM)具有深度大且探测精度高的特点，是目前电磁法领域研究热点之一。为推进多道瞬变电磁法深部探测系统的研发，对多道瞬变电磁法的技术特点及地球物理机制进行了分析。首先，对多道瞬变电磁法的关键技术进行总结，其特点包括：采用大功率接地源形式；编码发射；多道观测；类地震资料处理。然后，指出多道瞬变电磁法的地球物理实质：多道瞬变电磁法属于近源测深，即通过改变偏移距达到测深目的；接收信号包括系统响应和大地脉冲响应(即含有一次场与二次场的混合场)信号，采用反卷积方法获取大地脉冲响应。最后，针对中国复杂环境下的深部探测，对现有的多道瞬变电磁法提出改进思路：①把二维观测系统改进成三维观测系统，即三维数据采集系统，使其应用性更强且更方便，探测深度大，精度高；②把常规一维拟地震资料简单处理改进成三维拟地震成像解释；③从油气勘探领域拓展到复杂的深部矿产资源领域。
다도순변전자법(MTEM)구유심도대차탐측정도고적특점，시목전전자법영역연구열점지일。위추진다도순변전자법심부탐측계통적연발，대다도순변전자법적기술특점급지구물리궤제진행료분석。수선，대다도순변전자법적관건기술진행총결，기특점포괄：채용대공솔접지원형식；편마발사；다도관측；류지진자료처리。연후，지출다도순변전자법적지구물리실질：다도순변전자법속우근원측심，즉통과개변편이거체도측심목적；접수신호포괄계통향응화대지맥충향응(즉함유일차장여이차장적혼합장)신호，채용반권적방법획취대지맥충향응。최후，침대중국복잡배경하적심부탐측，대현유적다도순변전자법제출개진사로：①파이유관측계통개진성삼유관측계통，즉삼유수거채집계통，사기응용성경강차경방편，탐측심도대，정도고；②파상규일유의지진자료간단처리개진성삼유의지진성상해석；③종유기감탐영역탁전도복잡적심부광산자원영역。
Multi-transient electromagnetic method (MTEM)has the merit of detecting deeper target with higher resolution, and becomes one of hot topics. In order to develop MTEM instrument system, Technical characteristics and geophysical mechanics of MTEM were discussed.Firstly,the key technology of MTEM includes that superpower grounded-wire is the source of MTEM;transmitter signal is generated by pseudo random binary sequence (PRBS) form;multi-channel receivers are employed for signal collection;seismic method is adopted in data processing.Secondly,the geophysical mechanics of MTEM include that because of the array layout,MTEM belongs to near-source sounding or geometric sounding,which means that changing the offset distance can finish the deep target;the receiver signals include system and impulse responses,which is an information mixed with primary field and secondary field,and the impulse response can be collected by deconvolution method. Finally, for the deeper buried target detection with complexity condition in China,the new modified MTEM is proposed that two-dimensional data collection system is modified into three-dimensional,so as to make the method more applicable and convenient for exploration and obtain a greater detection depth with higher detection accuracy;traditional one-dimensional pseudo-seismic interpretation is improved into three-dimensional data imaging system;the application scope is enlarge from petroleum exploration to ore deposit investigation.