(1. 有色金屬成礦預(yù)測與地質(zhì)環(huán)境監(jiān)測教育部重點(diǎn)實(shí)驗(yàn)室(中南大學(xué))，長沙 410083；
2. 有色資源與地質(zhì)災(zāi)害探測湖南省重點(diǎn)實(shí)驗(yàn)室，長沙 410083；
3. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長沙 410083)
摘 要: 礦產(chǎn)資源是實(shí)現(xiàn)“兩個(gè)一百年”奮斗目標(biāo)的物質(zhì)基礎(chǔ)，隨著淺部資源的日漸枯竭，“深地探測”戰(zhàn)略提出向地球深部進(jìn)軍。電磁法是深地探測的支柱方法之一，但由于地球內(nèi)部非均勻性強(qiáng)、耗散介質(zhì)多，致使地下電磁波傳播方程的求解成為世紀(jì)難題，因而傳統(tǒng)電磁法在探測深度、探測精度和探測準(zhǔn)確度方面存在不足，成為“深地探測”戰(zhàn)略的關(guān)鍵瓶頸。筆者經(jīng)過多年的科研攻關(guān)，發(fā)明了廣域電磁法，建立了以曲面波為核心的電磁勘探理論，構(gòu)建了全息電磁勘探技術(shù)體系，實(shí)現(xiàn)了頻率域電磁法由平面波到曲面波的跨越；研發(fā)了具有完全自主知識(shí)產(chǎn)權(quán)的大深度高精度探測技術(shù)與裝備，實(shí)現(xiàn)了強(qiáng)干擾條件下電磁信號(hào)的高信噪比-高精度-快速測量，打破了國外電磁法儀器裝備的長期壟斷。廣域電磁法的探測深度、分辨率和信號(hào)強(qiáng)度分別是可控源音頻大地電磁法(CSAMT法)的5倍、8倍和125倍，實(shí)現(xiàn)了電磁法由粗放到精細(xì)的跨越，有力地支撐了面向國家重大需求的“深地探測”戰(zhàn)略。
關(guān)鍵字: 廣域電磁法；大深度；高精度；偽隨機(jī)信號(hào)
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University), Ministry of Education; Changsha 410083, China;
2. Key Laboratory of Non-ferrous and Geological Hazard Detection, Changsha 410083, China;
3. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China）
Abstract:Mineral resources are the material basis for building a moderately prosperous society in all respects by the time the Communist Party of China celebrates its centenary in 2021, and to turn China into a modern socialist country that is prosperous, strong, democratic, culturally advanced, and harmonious by the time the People’s Republic of China celebrates its centenary in 2049. With the depletion of shallow resources, the strategy of ‘deep exploration’ is proposed for mineral resources. Electromagnetic method is one of the pillar methods for deep exploration. However, due to the strong inhomogeneity and dissipation of the earth, the solution of the propagation of underground electromagnetic wave has become a century-old problem. Therefore, the traditional electromagnetic method has some shortcomings in probe depth, accuracy and accuracy, which has become the key bottleneck of the ‘deep exploration’ strategy. The author invented a new geophysical exploration method-wide field electromagnetic method (WFEM), established the electromagnetic exploration theory with curved surface wave as the core, and constructed the technical system of holographic electromagnetic exploration. The span of frequency-domain electromagnetic method from plane wave to curved wave was realized. The author also developed a large-depth and high-precision exploration technology and equipment with completely independent intellectual property rights, which realizes high signal-to-noise ratio, high precision and fast measurement of electromagnetic signals under strong interference conditions. The probe depth, resolution and signal intensity of WFEM are 5, 8 and 125 times higher than those of CSAMT, respectively, realizing the leap from rough to fine of electromagnetic method.
Key words: wide field electromagnetic method; large depth; high precision; pseudo-random signal
