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Compensation direction filtering method of two-dimensional grid data

A technology of direction filtering and two-dimensional grid, which is applied in the field of digital filtering and compensation direction filtering of two-dimensional grid data. Noise data and other problems, to achieve the effect of strong directionality of filtering

Active Publication Date: 2014-01-15
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Problems solved by technology

This method does not have the effect of iterative and local field compensation, and the directionality is poor
[0004] Geological Press, 2005.6, P194-204 discloses a method of "Gravity Field and Gravity Exploration", which uses the space domain sliding window weighted average method to establish a smoothing filter, which has a smoothing filtering effect on the data and can obtain the regional field, but The directional filtering method of this method has poor performance, and the directional anomalies are often smoothed, so it is impossible to extract directional anomaly information in the processing and interpretation of gravity and magnetic exploration data, and the directional filtering method cannot be used to suppress the directional gravity and magnetic noise data in the gravity and magnetic data.

Method used

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  • Compensation direction filtering method of two-dimensional grid data
  • Compensation direction filtering method of two-dimensional grid data
  • Compensation direction filtering method of two-dimensional grid data

Examples

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Embodiment Construction

[0057] The present invention will be described in detail below in conjunction with examples.

[0058] This example is implemented through the following steps:

[0059] 1) Carry out field aeronautical magnetic prospecting, collect the original data of aeronautical magnetic force and perform grid processing, see image 3 ;

[0060] 2) The calculation window adopts a window with 7 rows and 7 columns (see figure 1 ), the number of iterations is 2;

[0061] Step 2) The operation window size is 7 rows and 7 columns, see figure 1 .

[0062] 3) Divide the azimuth angle in the window and the node distribution in the window corresponding to each azimuth, see figure 1 ;

[0063] Step 3) Dividing azimuths in the window is divided into South and North, East and West, North East and Southwest, North West and Southeast, North North East and South South West, North East and South West West, There are 16 north-northwest and south-southeast orientations, north-west-west and south-east or...

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Abstract

The present invention relates to a gravity and magnetic force exploration data processing technique in geophysical exploration, and is a compensation direction filtering method for two-dimensional grid data. Gridding processing is performed on original data. Azimuth and node distribution in each window which corresponds with each orientation are divided in each window. The node coefficient in background field filtering and the node coefficient in calculating a residual field compensation filtering on each orientation are set. The background field value of the filtering orientation in each window is calculated. Cyclic iteration is performed for finishing compensation direction filtering. The compensation direction filtering method of the two-dimensional grid data has high filtering directivity and satisfies the required for extracting direction abnormity information in heavy magnetic processing, and simultaneously can satisfy the requirement for restraining abnormity information in a certain direction. The compensation direction filtering method for the two-dimensional grid data leads to progress in heavy magnetic exploration data processing and interpreting technique, and simultaneously provides a new method for processing directional filtering of the two-dimensional grid data in other subjects.

Description

technical field [0001] The invention relates to the field of gravity and magnetic prospecting data processing in geophysical prospecting, belongs to digital filtering technology, and is a compensation direction filtering method for two-dimensional grid data. Background technique [0002] In the acquisition of magnetic (including aeromagnetic) data, the linear anomalies along the line caused by reasons such as consistency differences between survey lines have directions, and these directional anomalies are the interference of geological research (that is, data noise). Therefore, in In the processing and interpretation of gravity and magnetic exploration data, it is necessary to extract directional anomaly information to meet the needs of interpreting faults and structures. It needs to be processed before data processing and interpretation, that is, the directional filtering method is used to suppress the directional gravity and magnetic noise in the gravity and magnetic data. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V7/02G01V3/38
Inventor 刘云祥
Owner BC P INC CHINA NAT PETROLEUM CORP
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