Apparent resistivity measuring system and method using semi-airborne electromagnetic method

An apparent resistivity measuring system using a semi-airborne electromagnetic method, comprising:

• a magnetic field sensor for acquiring magnetic field response data;
• an electric field sensor for acquiring electric field response data;
• wherein the electric field sensor comprises:
• a sensing unit comprising two capacitance modules symmetrically distributed and having the same size, wherein capacitance is calculated by measuring voltages of the two capacitance modules, and the electric field response data is calculated and obtained by means of the capacitance;
• and a readout unit comprising an integration module and an amplifier, wherein the integration module is configured to condition a frequency response curve of the electric field sensor into a flat straight line;
• a processor, wherein the magnetic field sensor and the electric field sensor each are connected to the processor, and the processor is configured to perform calculation to obtain tippers according to the magnetic field response data, perform calculation to obtain impedance, Cagniard apparent resistivity and fitted apparent resistivity according to the magnetic field response data and the electric field response data, and perform inversion according to one or more kinds of data of the tippers, the fitted apparent resistivity, the impedance and the Cagniard apparent resistivity to obtain underground resistivity;
• wherein the magnetic field response data is three-component magnetic field response data, and the electric field response data is two-component electric field response data;
• the processor calculates fitted apparent resistivity on the basis of the horizontal electric field response data of a single x direction and the magnetic field response data of a single vertical component;
• the processor calculates impedance and Cagniard apparent resistivity in x and y directions on the basis of the electric field response data in a horizontal direction and the magnetic field response data in the horizontal direction;
• and
• the processor calculates tippers on the basis of the magnetic field response data utilizing three components.