大地电磁法在深部地质构造探测中的应用研究
发布时间：2018-10-29 11:48
【摘要】：随着矿产资源消耗的日益加剧,能源危机日益成为制约社会发展的主要因素,为了解决这个问题,在江西某区开展了MT大地电磁测深工作,为深部找矿研究提供理论和方法上的指导作用。由于该地区复杂的地形形势,使得地震方法无法在当地展开工作,大地电磁测深法其本身具有装备简便、操作容易、野外工作成本低、工作效率高、装置布设灵活、探测深度大等特点,此外其还具有穿透高阻屏蔽层的影响,因此MT法在该区深部地质构造调查中能够得到有效的应用。在利用MT方法进行工作之前我们必须先在该地区对同时工作的多台仪器和磁棒进行标定,通过标定曲线确定仪器和磁棒的性能稳定性是否符合要求。同一个工区多台仪器同时工作一致性试验不可缺少,通过在同一测点多台仪器同时测量,由测量的曲线进行分析,得出仪器的一致性符合工作要求的需要。同时通过试验确定了有效的采集时间和装置系数。对测点的布置和注意事项进行了详细的说明。同时由于工作条件的限制,本次工作在数据处理的过程中遇到受到污染较为严重的数据的时候,采取了互参考道试验,通过试验我们得到了在处理受到污染较严重的数据时互参考磁道的效果最好,在本次数据处理的过程中对质量较差的数据通常会采用磁参考道进行处理。同时也尝试形态滤波法对含有方波、三角波、脉冲等干扰的实测大地电磁数据进行剔除和信号重构,取得很好的效果。通过对该区的测线通过不同反演模式对比,得出二维TM反演方式能够在该区得到最佳的应用效果,并且讨论了不同反演参数的选择对处理的影响,得到最佳的适合该区的参数设置,最后通过对该区的两条2D反演图进行分析,反演结果很好划定断裂带和深部地质结构,论文的研究成果为该区和相似地区的深部找矿与探测提供技术的支撑。本文最后提供了相关建议,在工作条件具备建立远参考点时,可以采用此方法对受到较大污染的数据进行处理,并且在解释的过程中结合重、磁和钻井等相关资料进行解释。
[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.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.325
[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.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.325
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