【摘要】：隨著礦產(chǎn)資源消耗的日益加劇,能源危機(jī)日益成為制約社會(huì)發(fā)展的主要因素,為了解決這個(gè)問題,在江西某區(qū)開展了MT大地電磁測(cè)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(shì),使得地震方法無法在當(dāng)?shù)卣归_工作,大地電磁測(cè)深法其本身具有裝備簡(jiǎn)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(cè)深度大等特點(diǎn),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(jìn)行工作之前我們必須先在該地區(qū)對(duì)同時(shí)工作的多臺(tái)儀器和磁棒進(jìn)行標(biāo)定,通過標(biāo)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(gè)工區(qū)多臺(tái)儀器同時(shí)工作一致性試驗(yàn)不可缺少,通過在同一測(cè)點(diǎn)多臺(tái)儀器同時(shí)測(cè)量,由測(cè)量的曲線進(jìn)行分析,得出儀器的一致性符合工作要求的需要。同時(shí)通過試驗(yàn)確定了有效的采集時(shí)間和裝置系數(shù)。對(duì)測(cè)點(diǎn)的布置和注意事項(xiàng)進(jìn)行了詳細(xì)的說明。同時(shí)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(yán)重的數(shù)據(jù)的時(shí)候,采取了互參考道試驗(yàn),通過試驗(yàn)我們得到了在處理受到污染較嚴(yán)重的數(shù)據(jù)時(shí)互參考磁道的效果最好,在本次數(shù)據(jù)處理的過程中對(duì)質(zhì)量較差的數(shù)據(jù)通常會(huì)采用磁參考道進(jìn)行處理。同時(shí)也嘗試形態(tài)濾波法對(duì)含有方波、三角波、脈沖等干擾的實(shí)測(cè)大地電磁數(shù)據(jù)進(jìn)行剔除和信號(hào)重構(gòu),取得很好的效果。通過對(duì)該區(qū)的測(cè)線通過不同反演模式對(duì)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(duì)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(duì)該區(qū)的兩條2D反演圖進(jìn)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(cè)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(yuǎn)參考點(diǎn)時(shí),可以采用此方法對(duì)受到較大污染的數(shù)據(jù)進(jìn)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(jìn)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(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P631.325

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