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Fast and accurate depth inversion method of transient electromagnetic data

A transient electromagnetic method, transient electromagnetic technology, applied in the field of geophysical exploration

Inactive Publication Date: 2012-07-25
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology

[0005] The technical problem solved by the present invention is to provide a solution to the problem that the inversion depth existing in the existing transient electromagnetic data processing technology is difficult to match the actual geological conditions A Fast and Accurate Depth Inversion Method for Transient Electromagnetic Data

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  • Fast and accurate depth inversion method of transient electromagnetic data
  • Fast and accurate depth inversion method of transient electromagnetic data
  • Fast and accurate depth inversion method of transient electromagnetic data

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Embodiment Construction

[0047] The present invention will be described in detail below in conjunction with specific implementation methods and accompanying drawings.

[0048] see figure 1 , the present invention is realized through the following steps:

[0049] (1) According to the simple relationship that the period in the magnetotelluric method is equal to the delay time in the transient electromagnetic method

[0050]

[0051]The apparent resistivity curve calculated by the transient electromagnetic method can be approximately converted into the measured apparent resistivity curve of the magnetotelluric method, where is the period in the magnetotelluric method, is the delay time in the transient electromagnetic method;

[0052] (2) Use the Bostic inversion method in the magnetotelluric method to construct the initial model, and take the Bostic depth

[0053]

[0054] is the initial inversion depth at the corresponding period point , the resistivity at the corresponding depth point ...

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Abstract

The invention relates to a fast and accurate depth inversion method of transient electromagnetic data. According to the delay time equivalent simple relationship in a periodic and transient electromagnetic method of a magnetotelluric method, a Bostick inversion method of the magnetotelluric method is adopted for building an initial model, the Bostick depth is taken, and finally, the thickness and the electric resistivity of each electric layer are sequentially adjusted according to differences between measured values and apparent resistivity theoretical fitted values calculated through inversion. The invention has the advantages that the method is simple and convenient, the operation is easy, good processing effects are realized on theoretical data and actual measurement data, the fast inversion can be realized to obtain the depth conforming to the geologic structure, and the data processing speed and the explanation precision of the transient electromagnetic method are greatly improved, so the great development and the application of the method technology are promoted.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, and relates to a fast and accurate depth inversion method for transient electromagnetic data. Background technique [0002] Transient electromagnetic method, referred to as TEM, is an electromagnetic prospecting method widely used in resource exploration, engineering geophysical prospecting, hydrological prospecting and other fields in recent years. The current popular depth calculation methods of this method mainly include skin depth estimation method, equivalent conductive plane method and smoke ring theory method, etc. These methods are simple to calculate, but the calculation results often have large deviations from the actual geological conditions, and cannot be well calculated. It reflects the underground geological structure; while the generalized inverse inversion has high calculation accuracy, but due to the complex calculation method and large amount of calculation, the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38
Inventor 范涛王信文程建远
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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