Chinese Academy of Sciences

Nannan Zhou

Guoqiang Xue

Shun Zhang

Weiying Chen

Qingyun Di

Shu Yan

Wen Chen

Kangxin Lei

Xinhao Wei

Disclosed are a multi-line source ground-borehole transient electromagnetic detection method and a multi-line source ground-borehole transient electromagnetic detection device. The method includes following steps: S1, constructing a multi-line source ground-borehole transient electromagnetic forward model; S2, obtaining multi-line source ground-borehole transient electromagnetic responses of an underground target layer by the multi-line source ground-borehole transient electromagnetic forward model; and S3, recognizing the underground target layer according to electromagnetic diffusion characteristics of the multi-line source ground-borehole transient electromagnetic responses. A resolution and a detection capability of the underground target by a ground-borehole transient electromagnetic method is greatly improved by adopting technical schemes.

Multi-line source ground-borehole transient electromagnetic detection method and multi-line source ground-borehole transient electromagnetic detection

Disclosed is a method for extracting IP information in a TEM response of a grounded-wire source, comprising the following steps: 1) obtaining subsurface resistivity through inversion of a vertical magnetic field less influenced by an IP effect; 2) obtaining an electric field response not influenced by the IP effect based on forward modeling of the obtained underground electrical structure; 3) removing the influence of the IP effect on an observed response to obtain a pure IP response; and 4) inverting the obtained IP response to obtain IP information of polarizability, a frequency dependence, and a time constant. The method of the present invention provides a new idea for further extracting IP information in a TEM response.

Method for extracting IP information from grounded-wire transient electromagnetic response

Provided are a method and a system for transient electromagnetic-induced polarization field separation and multi-parameter information extraction. The method includes the following steps: obtaining electromagnetic data influenced by an induced polarization effect; performing a separating treatment of an induced polarization field and an electromagnetic field on the electromagnetic data influenced by the induced polarization effect to obtain a pure electromagnetic response field and a pure induced polarization response field; based on the pure electromagnetic response field and the pure induced polarization response field, respectively performing a multi-parameter information inversion to complete an extraction of geoelectric parameters. This system includes a data obtaining module, a field separation module and a parameter inversion module.

Method and system for transient electromagnetic-induced polarization field separation and multi-parameter information extraction

Disclosed is an exploration method and system for pegmatite veins. The exploration method includes: three grounding electrodes are arranged at each observation point in a target area where pegmatite veins are located, and collecting electric field differences between two groups of grounding electrodes; drawing a multi-channel map, based on positions of the grounding electrodes, according to the electric field differences; obtaining resistivity variation characteristics of pegmatite veins according to the transverse variation of multi-channel map, and determining locations and lithologic characteristics of pegmatite veins according to the resistivity variation characteristics. Through functional modules with different functions, an exploration system is formed to realize the exploration method mentioned in the application.

Exploration method and system for pegmatite veins

The disclosure pertains to the field of electromagnetic exploration, and in particular relates to a device and method for ground source transient electromagnetic near-field detection and related device, with the purpose of solving the problems that the method for loop source transient electromagnetic detection has a relatively small detection depth and weak signals. The device of the disclosure includes an excitation source emitting device and a receiving device for signal detection. The excitation source emitting device includes an emission source, the emission source is a grounded conductor wire; the grounded conductor wire is used to convert a bipolar pulsed current into an electromagnetic field to be emitted underground; and the receiving device is configured for detecting a magnetic field and/or electric field signal in a survey line segment of an observation range of the grounded conductor wire using the method of areal sideline scanning survey.

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Beijing, China

Nannan Zhou