Method and device for acquiring electric anisotropy of underground media based on direct current method

Abstract

The invention relates to a method and device for acquiring electrical anisotropy of underground media based on a direct current method. The method comprises the following steps: after arranging an emission field source at any position of a measurement area, carrying out whole-area observation in the measurement area by adopting mutually orthogonal electrodes to obtain mutually orthogonal potential differences in two directions between different measurement points, calculating apparent resistivity according to the potential differences, calculating normalized apparent resistivity, calculating background apparent resistivity according to a selected background resistivity model, calculating normalized background apparent resistivity, and calculating the resistivity anisotropy coefficient according to actual normalized resistivity and the normalized background apparent resistivity. According to the invention, field source arrangement is flexible and simple; by adopting the resistivity anisotropy coefficient, the influence of an apparent resistivity null line can be effectively suppressed, the projection and the shape of an underground anisotropic structure on the ground can be well reflected, tensor resistivity can be prevented from being solved, and high efficiency is obtained; and the normalized apparent resistivity is adopted, so the error of the apparent resistivity near the field source can be effectively counteracted, and precision is improved.

Description

technical field [0001] The present application relates to the field of geophysical prospecting, in particular to a method, device, computer equipment and storage medium for obtaining the electric anisotropy of underground media based on direct current prospecting. Background technique [0002] As a relatively mature geophysical method, direct current method is widely used in mineral exploration, hydrological environment detection, engineering exploration and other fields. The earth's surface rocks form complex structures and faults due to inhomogeneous components and geological processes, which have anisotropic characteristics. The electrical anisotropy characteristics of the underground medium can be obtained by using the direct current method to observe the surface or in the well. At present, the main exploration method of direct current method is P2 invariant apparent resistivity tensor measurement proposed by Bibby (1986). The measurement method is to use mutually ortho...

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Problems solved by technology

Obviously, this method needs to arrange two dipole field sources outside the measurement area. In addition, the tensor resistivity must be solved, and finally P can be obtained through calculation. 2 To represent the anisotropic characteristics of the resistivity of the underground medium, in this way, the field source layout is complicated, the processing process is complicated, and the work efficiency is low, especially when the amount of data is large, the processing is quite cumbersome

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