Three-dimensional numeral simulation method based on arbitrary dipole-dipole device for direct-current induced polarization method

Abstract

The invention discloses a three-dimensional numeral simulation method based on an arbitrary dipole-dipole device for a direct-current induced polarization method. The three-dimensional numeral simulation method includes the steps of adopting a three-dimensional direct-current induced polarization arbitrary dipole-dipole device to carry out all-region observation and parameter measurement; calculating a specific resistance model of a normalized background electric field of actually measured data; calculating the normalized transmission functions of the specific resistance and polarizability ofthe actually measured data; calculating the normalized transmission functions of the specific resistance and polarizability of a theoretical model. According to the method, under complex conditions, all-region observation of three-dimensional numeral simulation of the three-dimensional direct-current induced polarization arbitrary dipole-dipole device can be achieved without limitation of null lines of an electric field, the distribution of electrodes is flexible, and as for an important exploring area, the density of measurement points can be enhanced freely, the method is capable of adaptingto exploration in a complex environment; more abundant three-dimensional information of an underground target body can be obtained, and preparation conditions can be provided for inversion imaging ofeach anisotropic medium; the method has the advantages of being big in morphological difference, abundant in polarization information, high in resolution ratio, and capable of effectively improving the calculation accuracy of numeral simulation.

Description

technical field [0001] The invention specifically relates to a three-dimensional numerical simulation method based on an arbitrary dipole-dipole device using a direct current excitation method. Background technique [0002] Geophysics is a comprehensive discipline that studies the earth and searches for mineral resources inside the earth through quantitative physical methods (such as seismic elastic waves, gravity, geomagnetism, geoelectricity, geothermal and radioactive energy, etc.). Earth's crust, mantle, core, and atmosphere. In recent years, the development of geophysics has become faster and faster, and people have paid more and more attention to it. [0003] The direct current induced electricity method is a very important detection method in geophysics. DC IP method can be divided into ground DC IP method, borehole DC IP method and tunnel DC IP method according to different excitation and observation conditions. Resource detection, archaeology, environmental and d...

AI Technical Summary

Problems solved by technology

[0007] 1) Due to the use of single-pole-monopole or three-pole devices, it is difficult to supply large currents underground, and only shallow exploration can be carried out. In addition, due to the existence of "infinity" electrodes, field construction is inconvenient;

[0008] 2) All electrodes are connected to the same cable, resulting in inflexible field construction, very strict requirements for electrode layout, and difficult to construct in areas with complex terrain;

[0009] 3) The measurement data may be too dense, resulting in a waste of construction resources

[0010] Although the construction method of forming a 3D survey network with 2D survey lines is simple and feasible, it is difficult to obtain high-precision imaging results due to the limited 3D information of underground targets acquired by 2D survey lines.

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