Data processing method for carrying out static correction on transient electromagnetic data

A transient electromagnetic and data processing technology, applied in the field of geophysical exploration, can solve problems such as static effects, and achieve the effect of easy operation, simple method and good processing effect

Active Publication Date: 2012-06-13
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 data processing method for performing static correction on transient electromag

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  • Data processing method for carrying out static correction on transient electromagnetic data
  • Data processing method for carrying out static correction on transient electromagnetic data
  • Data processing method for carrying out static correction on transient electromagnetic data

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with specific implementation methods and accompanying drawings.

[0032] see figure 1 , the present invention is realized through the following steps:

[0033] (1) First, ensure that the data eliminates the influence of field electromagnetic interference and border effects;

[0034] (2), according to the late apparent resistivity formula

[0035]

[0036] Calculate late apparent resistivity, where Heng / m, S T is the transmit loop area, S R is the receiving coil area, t is the measurement time, V(t) / I is the normalized induced electromotive force;

[0037] (3) According to the empirical formula of apparent depth

[0038]

[0039] Calculate the apparent depth, where, is the apparent depth, is an empirical parameter, is the apparent resistivity, is the measurement time;

[0040] (4) Select the reference point and correction method according to the elevation data of the measur...

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Abstract

The invention relates to a data processing method for carrying out static correction on transient electromagnetic data. The method comprises the following steps: ensuring that influences of field electromagnetic interference and a frame effect are eliminated, calculating late period apparent resistivity according to a late period apparent resistivity formula, calculating apparent depth according to an apparent depth empirical formula, selecting a reference point and a correction mode according to measuring point elevation data, determining a static correction factor d through a ratio between each measuring point apparent depth and reference point apparent depth, correcting values of V and t by utilizing relations between the static correction factor d and cube and square of V and t, substituting obtained corrected Vc into the late period apparent resistivity formula to calculate new rho[c], substituting the new rho[c] into the apparent depth empirical formula to obtain corrected apparent depth, and adding reference point elevation to the depth to complete a static correction process. According to the invention, false abnormity generated by landform fluctuation in qualitative interpretation can be rapidly and effectively eliminated, transient electromagnetic method data processing speed and interpretation precision are substantially raised, and large scale development and 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 data processing method for performing static correction on transient electromagnetic data. Background technique [0002] The concept of static correction is mostly used in seismic exploration technology in the field of geophysical exploration. With the development of technology, this concept is gradually introduced in some electromagnetic prospecting. For example, in the frequency electromagnetic sounding method, when there are local electrical inhomogeneous two- and three-dimensional geological bodies on the surface or near the surface, a charge accumulation effect will be formed on the surface of the inhomogeneous body, which will distort the electric field, and the distortion value is the same as The emission frequency is irrelevant, this is the static effect, which requires static correction processing, otherwise it will seriously affect the qualitative proces...

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Application Information

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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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