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Method for removing abnormal noise in single-point reception of seismic record by digital detector

A digital geophone and seismic recording technology, applied in the direction of seismic signal processing, etc., can solve the problems of damaging high-frequency information of seismic records, destroying data fidelity, etc., achieving removal of abnormally strong energy interference, removal of high-frequency interference, and improvement of signal quality. The effect of the noise ratio

Active Publication Date: 2011-04-20
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Compared with conventional geophones, digital geophones have many advantages, such as better amplitude and phase response at low frequency and high frequency, single-point multi-component reception, higher vector fidelity, and it is not affected by external electromagnetic waves. The effect of signal interference, but there is high-frequency background noise and other strong energy interference
The existing methods for removing abnormal noise are all developed for the seismic data received by the combination of conventional analog geophones. If they are applied to the single-point seismic data received by digital geophones, the fidelity of the data will be destroyed, especially the seismic records. High-frequency information in the medium, which is contrary to the application of the digital detector

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  • Method for removing abnormal noise in single-point reception of seismic record by digital detector

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Embodiment Construction

[0020] The present invention is completed in the frequency space domain and the time space domain. First, the weighted median constraint of the adjacent channel is used in the frequency space domain to eliminate the noise components in the frequency domain, and then the weighted median constraint of the adjacent channel is used in the time space domain. , and further remove the noise components, achieving effective attenuation of abnormal noise.

[0021] Realization principle of the present invention is as follows:

[0022] Suppose a group of seismic records is x(i, j), which is X(i, j) after Fourier transform, and the amplitude spectrum is F(k, j), where i is the time sequence number (i=1, 2, ..., N ); j is the track number (j=1, 2, . . . , 2m+1); k is the frequency number (k=1, 2, . . . , NFFT).

[0023] Each item of the sequence repeats w k The median value of the sequence composed of times is the weighted median value of the sequence, where w k is the weighting coeffici...

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Abstract

The invention relates to a method for removing abnormal noise in single-point reception of seismic record by a digital detector when seismic data processing. The method comprises the following steps: obtaining a weighted median for a trace adjacent to each frequency sample point relative to an amplitude spectrum; comparing the median and an amplitude value of each frequency sample point, and calculating a weighted value if the amplitude value is more than a threshold value; attenuating a trace where the frequency sample point is located in a frequency space field to obtain a noise frequency spectrum; carrying out inverse transformation on the noise frequency spectrum to obtain time and space field noise; detracting noise from the original record, removing the abnormal value of the frequency field, and changing and calculating residual strong energy interference in an envelope trace attenuation record. The invention effectively attenuates abnormal noise, can effectively remove high-frequency interference and abnormal energy interference in the record and improves the signal-to-noise ratio of the seismic data.

Description

technical field [0001] The invention relates to seismic data processing technology, and is a method for removing abnormal noise in single-point receiving seismic records of a digital geophone for suppressing high-frequency background and other strong energy interference. Background technique [0002] In order to improve the imaging quality of complex underground structures and the ability and accuracy of surface seismic description of oil and gas reservoirs, high-density acquisition technology based on single-point reception of digital geophones emerged as the times require. Compared with conventional geophones, digital geophones have many advantages, such as better amplitude and phase response at low frequency and high frequency, single-point multi-component reception, higher vector fidelity, and it is not affected by external electromagnetic waves. The influence of signal interference, but there is high-frequency background noise and other strong energy interference. The ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
Inventor 陈海峰李彦鹏侯爱源孙鹏远岳媛媛雷娜
Owner BC P INC CHINA NAT PETROLEUM CORP
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