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Round window band-pass amplitude preservation filtering data processing method in geophysical exploration

A geophysical exploration and data processing technology, applied in the field of geophysical exploration, can solve the problems that the filter is not a continuous function, the signal does not maintain amplitude, and the passband and stopband attenuation areas are large.

Active Publication Date: 2012-02-01
PETROCHINA CO LTD
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Problems solved by technology

There are three main problems with other filters other than compensating smooth filtering. One is that the filter is not a continuous function, that is, there is a sudden break between the passband and the stopband, which causes the Gibbs phenomenon; the other is that it is not suitable for highlighting in The wavenumber domain is an intermediate frequency useful signal with a circular window; the third is that the attenuation area between the passband and stopband of the filter is relatively large, and the passband and stopband are not completely separated, and the signal in the passband of the filter does not maintain amplitude. The signal in the stop band is not completely suppressed, which not only affects the subsequent qualitative analysis, but more seriously affects the quantitative analysis

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  • Round window band-pass amplitude preservation filtering data processing method in geophysical exploration
  • Round window band-pass amplitude preservation filtering data processing method in geophysical exploration
  • Round window band-pass amplitude preservation filtering data processing method in geophysical exploration

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Embodiment Construction

[0036] The present invention will be described in detail below with reference to the accompanying drawings.

[0037] The LCR type gravimeter was used to collect 1 / 50,000 high-precision gravity data in a work area. The gravity data is processed according to the steps described in the summary of the invention, namely:

[0038] 1) Use a gravimeter in the work area to collect gravity data in the field;

[0039] 2) Carry out various routine corrections and corrections to the gravity data collected in the field;

[0040] 3) Use the interpolation method to grid the gravity data to form a regular network gravity data f a (x, y), where x and y are the coordinates of the plane grid points of the gravity data, respectively; the size of the gridded data is 275 rows × 327 columns.

[0041] 4) Use low-precision gravity data to supplement the edging; a (x, y) is transformed into an integer power of 2 gravity data f with the number of lines and points expanded b (x, y); in order to achie...

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Abstract

The invention relates to a round window band-pass amplitude preservation filtering data processing method in geophysical exploration. The method comprises the following steps of: gridding gravity and magnetic data by an interpolation method; supplementing an edge by using low-accuracy gravity and magnetic data; performing fast Fourier transform; calculating a round band window filtering frequencyresponse function in a wave number domain, and compensating; performing the fast Fourier transform to acquire the gravity and magnetic data subjected to band-pass filtering; and processing the gravity and magnetic data which has the size of the original data and is subjected to the band-pass filtering by using a reverse edge. By the method, a filter is subjected to signal amplitude preservation in a pass band, signals are completely restrained in a stop band, and gravity and magnetic abnormal low-frequency backgrounds and high-frequency noise can be suppressed; and the method is particularly suitable for intermediate-frequency useful signals of a round window in the wave number domain.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to a data processing method for circular window band-pass amplitude-preserving filtering in geophysical exploration. Background technique [0002] Geophysical exploration includes gravity, magnetism, electrical method, seismic exploration, etc. Gravity and magnetism are two geophysical methods with the earliest development, mature theory and wide application. Gravity and magnetic methods cover a wide area and are economical and fast, and are widely used in oil and gas, solid mineral resource exploration, regional and deep structural research, environmental and engineering surveys and other fields. Gravity and magnetic exploration includes three parts: data acquisition, processing and interpretation. [0003] Digital filtering is the filtering of signals in the case of digital signals. In digital signal processing, low-pass, high-pass, and band-pass filtering are the...

Claims

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Application Information

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IPC IPC(8): G01V3/38
Inventor 杨辉张研文百红王玲
Owner PETROCHINA CO LTD
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