Method for extracting induced polarization model parameters prospected by electrical method

Abstract

The invention relates to a method for extracting induced polarization model parameters prospected by electrical methods. The method adopts relative phase spectrum and amplitude spectrum to extract four parameters of a Cole-Cole model. With the effective restriction of the relative phase spectrum to electromagnetic coupling effect, only four parameters of a single Cole-Cole model are needed to be extracted; the extraction method is a combined extraction method which combines the MCMC method in random statistical algorithm with the least square method in deterministic algorithm, and the method has high extraction speed and high extraction accuracy, thus effectively enhancing the work efficiency of induced polarization model parameters, reducing extraction time and effectively restricting interference of electromagnetic effects.

Description

technical field [0001] The invention relates to a method for extracting parameters of a geophysical model, in particular to a method for extracting parameters of a Cole-Cole model in the frequency domain IP method of electrical prospecting. Background technique [0002] In electrical prospecting, in order to better correct electromagnetic coupling effects and evaluate IP anomalies, some scholars have proposed Spectrum IP (SIP). This method uses complex resistivity to identify the properties of the polarized body, so that the evaluation of the polarized body can be developed from qualitative to quantitative, and the accuracy of abnormal evaluation is greatly improved. It operates in a fairly wide frequency band (2 -8 ~2 10 Hz) range to measure the amplitude and phase of the complex resistivity, which overcomes the shortcomings of the general IP method, which has less information and cannot meet the requirements of electromagnetic coupling effect correction and evaluation of...

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Problems solved by technology

However, this method also has certain defects. Generally speaking, our main purpose is to obtain the parameters of the IP effect, but when there is an electromagnetic coupling effect, we cannot ignore its existence. Through the above-mentioned Cole-Cole dispersion Although the sum model can solve this problem to a certain extent, it will undoubtedly increase the difficulty of extraction and reduce the accuracy of extraction due to the need to extract double or even two to three times more parameters. At the same time, it also requires higher accuracy for the data measured by the instrument

In addition, this model can only ensure that the low-frequency part of the electromagnetic effect spectrum can be represented by the Cole-Cole model, but it is powerless for the mid-high frequency part

[0006] Although the SIP method can provide a large amount of effective information on the identification and separation of IP and electromagnetic effects and the evaluation of IP anomalies, compared with the original purpose of obtaining the parameters of the Cole-Cole model of IP effects, the current extraction and evaluation methods exist. The workload is heavy, the extraction accuracy is not enough, and the requirements for the accuracy of the instrument are high, which cannot completely solve the evaluation problem of electromagnetic effects

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