Method and device for automatically removing electromagnetic coupling in induced polarization measurement

Abstract

A method and device for automatically removing electromagnetic coupling in induced polarization measurement, the method comprising the following steps: (1) sending a special waveform pulse current underground, using the special waveform pulse current as the excitation current source for the induced polarization method; (2) receiving The geoelectric response of the special waveform pulse current, the geoelectric response is the geoelectric response including the induced polarization potential difference, the electromagnetic coupling potential difference and the DC potential difference; the geoelectric response is integrated to automatically remove the induced polarization measurement The obtained electromagnetic coupling potential difference, and then extract the pure excited polarization potential difference or DC potential difference respectively. The invention also includes means for automatically decoupling electromagnetic coupling in induced polarization measurements. Using the present invention can automatically remove the influence of electromagnetic coupling during the process of induced polarization measurement, and extract the underground information reflecting deep mineral resources, which is beneficial to increase the exploration depth of the induced polarization method and improve the exploration effect of the induced polarization method. Developing the economy provides more mineral resources.

Description

technical field [0001] The invention relates to a method and a device for automatically removing electromagnetic coupling in excitation polarization measurement in the field of geophysical exploration. Background technique [0002] Electromagnetic coupling is a phenomenon of electromagnetic induction caused by changes in electric (magnetic) fields over time. The more intense the electric (magnetic) field changes with time, the stronger the electromagnetic coupling, and the more serious its influence on the excited polarization measurement. [0003] With the rapid development of the economy, the shallow mineral resources have been developed in large quantities, and it is urgent to increase the exploration depth of the induced polarization method, requiring a larger polar distance. The electromagnetic coupling interference in the induced polarization measurement is more prominent when the pole distance is increased (because the influence degree of electromagnetic coupling is ...

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Problems solved by technology

However, since the excited polarization itself is also a process of gradually decaying and disappearing with time, when the electromagnetic coupling disappears, most of the excited polarization itself is also attenuated, and only a small residual excited polarization potential difference can be measured

Therefore, the method of delaying the measurement time to overcome the electromagnetic coupling is not effective.

In addition, corrections for electromagnetic coupling potential differences have also been used in the past to reduce electromagnetic coupling in induced polarization measurements, but the correction requires prior knowledge of local electromagnetic coupling and requires additional field or indoor calculation work The amount, the work is cumbersome, and the effect is not good

So far there is no method and device for automatically removing electromagnetic coupling in excited polarization measurement

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