Vertical magnetic source wave number apparent resistivity measurement method and device

Abstract

The present invention discloses a vertical magnetic source wave number apparent resistivity measurement method and device. The method comprises the steps of: laying a vertical magnetic source at the earth's surface and supplying current signals; arranging a measurement point at a position having a distance r from the vertical magnetic source and collecting a tangential electric field and a vertical electric field, and substituting the tangential electric field and the vertical electric field into a following simple cubic equation to calculate parameters x; and calculating the wave number apparent resistivity corresponding to the frequency at the measuring point and the wave number of the electromagnetic field according to the parameters x, and calculating the phase based on the electromagnetic field. The method for analyzing and calculating the wave number of the electromagnetic wave and the corresponding apparent resistivity through the electric field and the magnetic field is suitable for any frequency and any transmit-receive distance, is accurate in result, and has ability on detection of the underground depth electricity structure in a short transmit-receive distance.

Description

technical field [0001] The invention belongs to the technical field of exploration geophysics, and in particular relates to a method and device for measuring wavenumber apparent resistivity of a vertical magnetic source. Background technique [0002] The frequency-domain controllable source electromagnetic sounding method generally uses the transmitter to supply an alternating current of a certain transmission current frequency to the ground through a grounded wire (horizontal electric dipole) or an ungrounded return wire (vertical magnetic dipole). The measuring point is laid outside a certain distance of sending and receiving, and the receiver is used to receive the electric field and / or magnetic field propagated through the earth. The apparent resistivity is calculated by a certain method through the electromagnetic field, and the apparent resistivity should be able to reflect the objective electrical change of the ground. By changing the frequency in turn, the change la...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the current CSAMT and WFEM methods cannot accurately solve the apparent resistivity of any part of the entire region, and the apparent resistivity of the entire region cannot be directly calculated from the field value. The present invention provides a vertical magnetic source wave number apparent resistance A method and device for measuring the rate, which can calculate the wavenumber apparent resistivity of any place in the whole area without iterative search for the magnetic source, which is suitable for any transceiver distance and any frequency, and there is no distortion at low frequencies, which can reflect the objective nature of the electrical properties of the underground medium law of change

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