本文選題：音頻大地電磁法 + 中淺部勘探�。� 參考：《地質(zhì)學(xué)報》2017年03期

【摘要】：音頻大地電磁法(AMT)作為一種中淺部勘探技術(shù),相較于傳統(tǒng)直流電法,具有工作效率高、不受高阻層屏蔽和對低阻層分辨率較高等優(yōu)點。本文基于四川廣元寶輪地區(qū)深部地質(zhì)調(diào)查的需求,依托研究區(qū)物性測試成果和地質(zhì)構(gòu)造背景,建立包含逆沖斷層、飛來峰構(gòu)造和巖體構(gòu)造的典型地電模型,使用正演軟件開展大地電磁正演模擬,分析了方法的有效性;然后在垂直構(gòu)造走向的方向開展AMT勘探工作,采用NLCG反演技術(shù)獲取高精度二維電性剖面,結(jié)合研究區(qū)物性測試成果和地表地質(zhì)調(diào)查成果,開展地質(zhì)地球物理綜合解釋并建立沿剖面方向的地質(zhì)模型,查明了梨樹壩斷層的深部展布特征、飛來峰構(gòu)造及主要地質(zhì)體的深部邊界與規(guī)模等地質(zhì)問題。研究結(jié)果表明:音頻大地電磁法是開展中淺部地質(zhì)調(diào)查的有效手段,能較好分辨出中淺部具有電性差異的不同規(guī)模地質(zhì)要素。
[Abstract]:Audio frequency magnetotelluric method (AMT), as a medium and shallow exploration technology, has the advantages of high working efficiency, no shielding from high resistance layer and high resolution to low resistivity layer, compared with the traditional DC method. Based on the requirement of deep geological survey in Guangyuan Baolun area, Sichuan province, a typical geoelectric model including thrust fault, Feilai peak structure and rock mass structure is established based on the physical property test results and geological structure background of the study area. Magnetotelluric forward modeling is carried out using forward modeling software, and the validity of the method is analyzed, then AMT exploration is carried out in the direction of vertical structural strike, and the high precision two-dimensional electrical profile is obtained by using NLCG inversion technique. Combined with the results of physical property test and surface geological survey in the study area, the geological geophysical comprehensive interpretation and the geological model along the section are established, and the deep distribution characteristics of the Lishuba fault are found out. Feilefeng structure and deep boundary and scale of main geological bodies and other geological problems. The results show that the Audio magnetotelluric method is an effective means to carry out the middle and shallow geological survey, and it can distinguish the different scale geological elements with electrical difference in the middle and shallow areas.
【作者單位】： 成都理工大學(xué)地球探測與信息技術(shù)教育部重點實驗室;中國地質(zhì)大學(xué)(北京);寧夏回族自治區(qū)地質(zhì)礦產(chǎn)勘查開發(fā)局;
【基金】：中國地質(zhì)調(diào)查局項目“龍門山構(gòu)造帶深部地質(zhì)調(diào)查”(編號1212011220263) 國家自然科學(xué)基金項目(編號41274078)資助成果
【分類號】：P631.325

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