High-density resistivity measuring system for stabilizing current field and current field stabilizing method

Abstract

The invention provides a high-density resistivity measuring system for stabilizing an artificial current field and a current field stabilizing method. The system comprises a stepped power supply unit,an intelligent detection and determining unit for the stability of the artificial current field and an intelligent control unit. The stepped power supply unit is used for providing stepped power supply voltage; the intelligent detection and determining unit for the stability of the artificial current field is used for determining whether or not the artificial current field in an underground halfspace is stable and sending a reminding signal to the intelligent control unit when it is determined that the artificial current field in the underground half space is unstable; the intelligent control unit is used for receiving the reminding signal and then controlling the stepped power supply unit to achieve automatic adjustment of the power supply voltage. A new viewpoint of establishing the stable artificial current field in a high-density apparent resistivity measurement array is proposed. According to the system and the method, the influence of an unstable field can be eliminated, industrial interference is suppressed, the signal-to-noise ratio is increased, and a measurement result can truly and reliably reflect the distribution of apparent resistivity in a detection depth range ofthe underground half space.

Description

Technical field [0001] The invention relates to the technical field of electric prospecting, in particular to a high-density resistivity measurement system for stabilizing an artificial current field and a current field stabilization method. Background technique [0002] In the early 1990s, Japan’s OYO Company and the University of Birmingham, UK, first developed an array electrical survey observation system, which enables electrical surveys to use an overlaid observation method like seismic surveys to obtain geoelectric information of the underground medium. This resistivity The array exploration method is called the high-density resistivity method. After that, many foreign geological instrument companies began to develop such advanced equipment, mainly including OYO in Japan, AGT and ZONGE in the United States, DMT in Germany, PASI in Italy, and GF in the Czech Republic. The developed high-density electrical method instrument is mainly divided into two forms: centralized (elec...

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Problems solved by technology

[0005] At present, the high-density electrical instruments used in China generally adopt a power supply method in which the power supply voltage between the power supply electrodes A-B in a measurement arrangement is fixed, so that as the distance between the power supply electrodes increases, the current density in the underground half-space becomes lower and increases. To a certain extent, the artificial current field in the underground half-space will become weak or unstable, especially if the long section is arranged, and the number of electrodes is large. When the voltage between the power supply electrodes A-B is fixed, the measurement of the small pole distance must be ensured. Power supply requirements will inevitably affect the power supply with large pole distances, especially in exploration areas with uneven grounding conditions and large industrial interference

As a result, the relatively deep measurement signal on a measurement section is unstable, and the repeatability is poor, which limits the detection depth and brings great difficulties to the interpretation of exploration results.

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