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Method for rapidly and accurately correcting frame influence for transient electromagnetic data

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

Inactive Publication Date: 2012-08-01
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Application Information

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Problems solved by technology

[0009] The technical problem solved by the present invention is to provide a solution to the interaction between the large fixed source construction method and the central loop interpretation method existing in the existing transient electromagnetic data processing technology. A Fast and Accurate Bounding Effect Correction Method for Transient Electromagnetic Data for Conflicting Problems

Method used

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  • Method for rapidly and accurately correcting frame influence for transient electromagnetic data
  • Method for rapidly and accurately correcting frame influence for transient electromagnetic data
  • Method for rapidly and accurately correcting frame influence for transient electromagnetic data

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Embodiment Construction

[0046] (1) According to field measured data , using the late apparent resistivity calculation formula of the central loop

[0047]

[0048] Calculate the corresponding apparent resistivity of each point, where Heng / m, S T is the sending loop area, S R is the receiving coil area, t is the measurement time, For the normalized induced EMF is the transient value, is the apparent resistivity, and π is the circumference ratio;

[0049] (2), according to the skin depth estimation formula

[0050]

[0051] Calculate the corresponding apparent depth, where, is the apparent depth, is an empirical parameter, is the apparent resistivity, is the measurement time;

[0052] (3) Construct the "thickness-resistivity" forward modeling model through the corresponding apparent depth-late apparent resistivity relationship;

[0053] (4) According to the given model in step 3, pass

[0054]

[0055] Calculate the frequency-domain electromagnetic field between the center ...

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Abstract

The invention relates to a method for rapidly and accurately correcting frame influence for transient electromagnetic data. The method provided by the invention comprises the following steps of: utilizing a centre loop line late stage apparent resistivity computational formula and a skin depth evaluation formula to calculate corresponding view depth construction thickness, namely resistivity forward model according to field measured data; calculating a frequency domain electromagnetic field of the center position and an actual position of a transmitting loop line through the formula according to the given model, and calculating the forward modeling time domain secondary field value of the center position and the actual position of the transmitting loop line of the point through the formula; and calculating a corrected parameter according to the formula, calculating corrected actual measurement normalization induced electromotive force according to the formula, presetting a number in advance, if the error meets the condition, finishing a corrected process, if not, repeating the all the steps, and until meeting the condition. The correction method provided by the invention can rapidly effectively eliminate influence brought by a frame effect in a qualitative interpretation, and greatly improve data processing speed and interpretation precision of a transient electromagnetic method,,thereby pushing the wide margin development and application of the method of the technology.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, and in particular relates to a fast and accurate correction method for frame influence of 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. During the construction of this method, in order to improve work efficiency and resolution, the transmission mode of large fixed source is generally adopted, the observation is carried out in the center 1 / 9 of the transmission frame, and the working method of interpreting the data is using the center loop method. [0003] Due to the inhomogeneity of the primary vertical magnetic field within the observation range, it will cause the difference in the eddy current field, that is, the observed eddy current fiel...

Claims

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Application Information

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