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Method for correcting interference of variance coefficient in gravity and magnetic interference zone

A technology for interference correction and interference area, which is applied in the field of geophysical exploration and can solve the problems of uncorrected interference, errors, and distortion of gravity and magnetic data interpretation.

Active Publication Date: 2011-11-09
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

However, there is no corresponding correction method for multi-point and contiguous interference areas, and there is no good method in the actual gravity and magnetic data processing. The interpretation of the gravity and magnetic data is distorted or wrong

Method used

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  • Method for correcting interference of variance coefficient in gravity and magnetic interference zone
  • Method for correcting interference of variance coefficient in gravity and magnetic interference zone
  • Method for correcting interference of variance coefficient in gravity and magnetic interference zone

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] The present invention is realized through the following technical solutions:

[0024] 1) Collect gravity data or magnetic three-column data in the field, and obtain the data collection point distance and field data collection observation error;

[0025] The three columns of data are x coordinate, y coordinate, gravity value or magnetic value z.

[0026] For example, it is known that the data collection point distance is 20m, and the collection observation error is 2.0nT. The implementation is as follows:

[0027] 2) Calculate the valve value f, and the valve value f=12.0nT.

[0028] 3) Calculate the mean A and variance σ of the observed data value z(0) within 60m around the first measuring point (4068620, 761340, 50.0), and calculate the difference dz between the observed value z(0) and the mean value A of the measuring point , z(0)=50.0nT, A=65.0nT, σ=4.0...

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Abstract

The invention relates to a method for correcting the interference of a variance coefficient in a gravity and magnetic interference zone in geophysical exploration, which comprises the following steps of: calculating a threshold value according to gravity data or magnetic force three-row data, wherein the threshold value is 6 times a data acquisition error; calculating an average value and a variance of observed data values of points which are 3 times an acquisition point distance far away from the periphery of a first measuring point; calculating a difference between the observed value and the average value of the measuring point, comparing the difference with the threshold value, and correcting when the absolute value of the difference is greater than the threshold value; operating otherobserved data points once to acquire data subjected to one-time iteration; and acquiring the corrected data values. By the method, a gravity and magnetic anomaly becomes smooth and continuous and theanomaly change accords with the anomaly characteristic of an underground field source after correction, and the distribution characteristics of an underground geologic body are reflected.

Description

technical field [0001] The invention belongs to geophysical prospecting methods, and relates to a variance coefficient interference correction method in gravity and magnetic interference areas. Background technique [0002] Gravity and magnetic exploration methods are two important geophysical exploration methods, which are widely used in the exploration of oil and gas, metal and non-metal minerals. Human interference on the surface causes data distortion in ground gravity and magnetic prospecting. It is necessary to correct this interference distortion in order to obtain undisturbed real data of underground geological bodies. In the existing gravity and magnetic prospecting specifications ("Technical Regulations for Ground Gravity Prospecting (SY / T5819-2002)"; "Technical Regulations for Surface Magnetic Prospecting (SY / T5771-2004)"), the correction method proposed for the influence of interference distortion is "Remove singular point", that is, to delete the single-point d...

Claims

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Application Information

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IPC IPC(8): G01V7/06
Inventor 刘云祥
Owner BC P INC CHINA NAT PETROLEUM CORP
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