【摘要】：隨著礦產(chǎn)資源消耗的日益加劇,能源危機日益成為制約社會發(fā)展的主要因素,為了解決這個問題,在江西某區(qū)開展了MT大地電磁測深工作,為深部找礦研究提供理論和方法上的指導(dǎo)作用。由于該地區(qū)復(fù)雜的地形形勢,使得地震方法無法在當?shù)卣归_工作,大地電磁測深法其本身具有裝備簡便、操作容易、野外工作成本低、工作效率高、裝置布設(shè)靈活、探測深度大等特點,此外其還具有穿透高阻屏蔽層的影響,因此MT法在該區(qū)深部地質(zhì)構(gòu)造調(diào)查中能夠得到有效的應(yīng)用。在利用MT方法進行工作之前我們必須先在該地區(qū)對同時工作的多臺儀器和磁棒進行標定,通過標定曲線確定儀器和磁棒的性能穩(wěn)定性是否符合要求。同一個工區(qū)多臺儀器同時工作一致性試驗不可缺少,通過在同一測點多臺儀器同時測量,由測量的曲線進行分析,得出儀器的一致性符合工作要求的需要。同時通過試驗確定了有效的采集時間和裝置系數(shù)。對測點的布置和注意事項進行了詳細的說明。同時由于工作條件的限制,本次工作在數(shù)據(jù)處理的過程中遇到受到污染較為嚴重的數(shù)據(jù)的時候,采取了互參考道試驗,通過試驗我們得到了在處理受到污染較嚴重的數(shù)據(jù)時互參考磁道的效果最好,在本次數(shù)據(jù)處理的過程中對質(zhì)量較差的數(shù)據(jù)通常會采用磁參考道進行處理。同時也嘗試形態(tài)濾波法對含有方波、三角波、脈沖等干擾的實測大地電磁數(shù)據(jù)進行剔除和信號重構(gòu),取得很好的效果。通過對該區(qū)的測線通過不同反演模式對比,得出二維TM反演方式能夠在該區(qū)得到最佳的應(yīng)用效果,并且討論了不同反演參數(shù)的選擇對處理的影響,得到最佳的適合該區(qū)的參數(shù)設(shè)置,最后通過對該區(qū)的兩條2D反演圖進行分析,反演結(jié)果很好劃定斷裂帶和深部地質(zhì)結(jié)構(gòu),論文的研究成果為該區(qū)和相似地區(qū)的深部找礦與探測提供技術(shù)的支撐。本文最后提供了相關(guān)建議,在工作條件具備建立遠參考點時,可以采用此方法對受到較大污染的數(shù)據(jù)進行處理,并且在解釋的過程中結(jié)合重、磁和鉆井等相關(guān)資料進行解釋。
[Abstract]:With the increasing consumption of mineral resources, the energy crisis has become the main factor restricting the development of society. In order to solve this problem, MT magnetotelluric sounding work was carried out in a certain area of Jiangxi Province. It provides guidance in theory and method for deep prospecting. Because of the complex terrain situation in this area, seismic method can not be carried out in the local area. The magnetotelluric sounding method itself has the advantages of simple equipment, easy operation, low field work cost, high work efficiency and flexible installation. In addition, it has the influence of penetrating high resistivity shielding layer, so MT method can be effectively applied in the deep geological structure survey in this area. Before we can work with MT method, we must calibrate several instruments and magnetic rods in this area at the same time. The calibration curve is used to determine whether the performance stability of the instruments and rods meets the requirements. The consistency test of multiple instruments in the same working area is indispensable. Through simultaneous measurement of multiple instruments at the same measuring point and analysis of the measured curves, it is concluded that the consistency of the instrument meets the requirements of the work. At the same time, the effective collection time and device coefficient are determined by experiments. The layout and points for attention of the survey points are described in detail. At the same time, due to the limitation of working conditions, when the work encountered more seriously polluted data in the process of data processing, the cross-reference channel test was adopted. The results show that the cross-reference track is the best in dealing with the seriously polluted data. In the process of this data processing, the data with poor quality are usually processed by the magnetic reference track. At the same time, morphological filtering method is also attempted to eliminate and reconstruct the measured magnetotelluric data with square wave, triangular wave, pulse and so on, and good results are obtained. Through the comparison of different inversion models for the measured lines in this area, it is concluded that the two-dimensional TM inversion method can obtain the best application effect in this area, and the influence of different inversion parameters on the processing is discussed. The best parameter setting suitable for this area is obtained. Finally, through the analysis of two 2D inversion maps in this area, the inversion results are very good in delineating the fault zone and deep geological structure. The research results of this paper provide technical support for deep prospecting and exploration in this area and similar areas. At the end of this paper, some suggestions are given. When the working conditions are good enough to set up the remote reference points, the method can be used to process the polluted data, and to interpret the related data such as gravity, magnetism and drilling in the process of interpretation.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P631.325

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