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Optimization processing technology for heavy magnetism by using continuation returning and vertical derivation technology

A processing method and target optimization technology, applied in the field of gravity prospecting and magnetic prospecting and processing, can solve problems such as difficult to distinguish between true and false, inconsistent interpretation, judgment, false anomalies, etc., to achieve the effect of improving resolution and realizing target processing

Inactive Publication Date: 2008-11-19
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcoming the shortcomings of the traditional vertical second derivative when amplifying the signal and amplifying the high-frequency noise at the same time, resulting in false anomalies, making it difficult for geological interpreters to distinguish between true and false when analyzing data, misjudgment occurs, and occurrences are different from the actual situation Inconsistent explanations and judgments lead to exploration mistakes

Method used

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  • Optimization processing technology for heavy magnetism by using continuation returning and vertical derivation technology
  • Optimization processing technology for heavy magnetism by using continuation returning and vertical derivation technology
  • Optimization processing technology for heavy magnetism by using continuation returning and vertical derivation technology

Examples

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Effect test

Embodiment 1

[0058] Embodiment 1: see attached figure 1 . Taking the gravity data of a certain area in the Jiyang Depression as an example, the effects of the traditional second derivative and the present invention are compared. The method of the present invention is that when processing indoors, first input the gravity and magnetic anomaly signals collected in the field into the computer, and process the gravity data according to the 9 steps described in the summary of the invention, namely:

[0059] ① Firstly, the gravity anomaly signal observed with irregular grid is gridded to form anomalous signal of regular grid;

[0060] ② Perform Fourier forward transform on the gravity signal of the regular network to obtain the spectrum of the original abnormal signal;

[0061] ③ Spectrum analysis: Determine the filter parameters on the spectrum diagram according to the distribution interval, amplitude and phase difference of the signal and noise, the number of derivatives n=2, the height of up...

Embodiment 2

[0075] Embodiment 2: see attached figure 1 . The following is the optimal processing of the continuation return vertical derivative target of the gravity anomaly signal in a certain area in North China. The method of the present invention is that when processing indoors, first input the gravity and magnetic anomaly signals collected in the field into the computer, and process the gravity data according to the 9 steps described in the summary of the invention, namely:

[0076] ① Firstly, the gravity anomaly signal observed with irregular grid is gridded to form anomalous signal of regular grid;

[0077] ② Perform Fourier forward transform on the gravity anomaly signal of the regular network to obtain the spectrum of the original anomalous signal;

[0078] ③ Spectrum analysis: Determine the filter parameters on the spectrum diagram according to the distribution interval, amplitude and phase difference of the signal and noise, the number of derivatives n=3, the height of upward...

Embodiment 3

[0089] Example 3: The upward continuation and downward return vertical derivative target optimization process of the magnetic anomaly in the Songliao Basin. The method of the present invention is that when processing indoors, first input the gravity and magnetic anomaly signals collected in the field into the computer, and process the magnetic anomaly signals according to the nine steps described in the summary of the invention, namely:

[0090] ① Firstly, the magnetic anomaly signal observed by the irregular grid is gridded to form a regular grid anomaly signal;

[0091] ② Carry out Fourier forward transform on the magnetic anomaly signal of the regular network to obtain the spectrum of the original anomalous signal;

[0092] ③ Spectrum analysis: Determine the filter parameters on the spectrum diagram according to the distribution interval, amplitude and phase difference of the signal and noise, the number of derivatives n=2, the height of upward extension and downward return...

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Abstract

Disclosed is a method for improving heavy magnet abnormal resolution. The method comprises gridding the heavy magnet abnormal grid data to form regular grid data; performing Fourier positive transformation on the regular grid heavy magnet data and calculating the frequency spectrum of the original data; analyzing spectrum, signal and the noise distribution area to identify filtering parameter; expanding upward with parsing method; returning downward with difference method; repeating the expanding upward and returning downward processes p times and be multiplied with the filter operator of the broad sense vertical n times differential coefficient; after Fourier transformation, calculating the processed data; drawing the two-dimensional or three-dimensional graphs of the processed data.

Description

technical field [0001] The invention relates to the technical field of gravity prospecting and magnetic prospecting processing in geophysical prospecting, in particular to a processing method for improving the resolution of gravity and magnetic anomalies on the premise of suppressing high-frequency noise in gravity and magnetic anomalies. Background technique [0002] The geophysical prospecting methods mainly used in geological prospecting include gravity prospecting, magnetic prospecting, electrical prospecting, seismic prospecting, etc. [0003] Gravity exploration is to use the gravimeter to observe the gravity anomaly caused by the difference of underground material density to find out the underground geological structure and lithological anomaly. Magnetic exploration is the use of magnetometers to observe magnetic anomalies caused by magnetic differences in underground objects to find out underground geological structures and magnetic anomalies such as volcanic rocks. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V7/06
Inventor 杨辉邹才能张研李明李建忠文百红
Owner PETROCHINA CO LTD