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

A technology for geophysical exploration and data processing, which is applied in the field of geophysical exploration and can solve problems such as large attenuation areas of passband and stopband, quantitative analysis of influence, and unprotected signal amplitude.

Active Publication Date: 2013-04-24
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

Method used

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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 in conjunction with the accompanying drawings.

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

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

[0039] 2) Perform various routine corrections and corrections on the gravity data collected in the field;

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

[0041] 4) Use the low-precision gravity data to supplement the border; the regular net gravity data f a (x, y) is transformed into the integer power gravity data f whose lines and points are expanded to 2 b (x, y); In order t...

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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 prospecting, in particular to a data processing method for circular window bandpass amplitude-preserving filtering in geophysical prospecting. Background technique [0002] Geophysical prospecting includes gravity, magnetic force, electrical method, seismic prospecting, etc. Gravity and magnetic force 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 various fields such as oil and gas, solid mineral resource exploration, regional and deep structure research, environmental and engineering surveys, etc. Gravity and magnetic prospecting include three parts: data acquisition, processing and interpretation. [0003] Digital filtering is to filter signals in the case of digital signals. In signal digital processing, low-pass, high-pass, and band-pass filter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/38
Inventor 杨辉张研文百红王玲
Owner PETROCHINA CO LTD
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