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电阻率层析成像技术是20世纪80年代末期发展起来的一种电法勘探方法。该方法具有测点密度大、工作效率高等特点,兼具剖面法和测深法的功能,因此近十几年发展迅速。但三维电阻率层析成像技术在许多技术环节上还有待完善,目前国内外还处在理论研究和实践探索阶段。介绍了三维电阻率层析成像技术的方法原理以及单极、轴向偶极和赤道偶极装置的特点;并用德国resecs电阻率测量系统对这三种装置的应用效果进行了比较;且对二维观测与三维观测进行了对比实验。试验结果表明:三种装置的勘探效果基本相同,不过单极装置的勘探深度要深一些,但需要布置无穷远极,比较费事;而赤道偶极的数据点比其它两种装置要多几倍,测量工作比较费时;另外,三维观测效果明显优于二维观测的效果。
Resistivity tomography is an electrical prospecting method developed in the late 1980s. The method has the characteristics of measuring point density, high working efficiency and the like, and has the functions of profile method and sounding method. Therefore, the method has developed rapidly in recent ten years. However, the three-dimensional resistivity tomography has yet to be improved in many technical aspects. At present, it is still at the stage of theoretical research and practical exploration at home and abroad. The method principle of three-dimensional resistivity tomography and the characteristics of monopole, axial dipole and equatorial dipole are introduced. The application effects of these three devices are compared with the German resecs resistivity measuring system. The comparison between 3D observation and 3D observation is carried out. The experimental results show that the exploration results of the three devices are basically the same, but the exploration depth of the unipolar device is deeper, but the infinity polar need to be arranged, which is troublesome. However, the data points of the equatorial dipole are several times more than those of the other two devices , The measurement work is time-consuming; In addition, the 3D observation effect is obviously better than the 2D observation effect.