Method for suppressing controllable seismic-source harmonic-wave interference

A technology of harmonic interference and source, applied in the field of harmonic interference suppression, can solve problems such as difficulty in determining the removal range, and difficulty in completely eliminating harmonic interference.

Inactive Publication Date: 2012-05-30
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

This method has certain practicability, but there are also shortcomings: due to the f -K T The harmonic interference in the domain is very close to the effective wave, so it is difficult to determi

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  • Method for suppressing controllable seismic-source harmonic-wave interference
  • Method for suppressing controllable seismic-source harmonic-wave interference
  • Method for suppressing controllable seismic-source harmonic-wave interference

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Embodiment Construction

[0097] The present invention can extract the fundamental wave signal from the time-frequency domain, and can also extract the harmonic interference in the time-frequency domain, and then subtract the harmonic interference from the original signal in the time domain to obtain an effective signal. Compression process such as figure 1 As shown, the rectangular box in the figure indicates the state of the data, the oval box indicates the processing of the data, and the arrow indicates the flow direction of the data.

[0098] Specific embodiments of the present invention will be described below in combination with actual seismic data.

[0099] The implementation of time-frequency domain extraction of fundamental signal is divided into 6 steps.

[0100] 1) Collect seismic data in the field, take a piece of seismic data before correlation and perform short-time Fourier transform, and transform the time-domain signal into the time-frequency domain;

[0101] Step 1) described short-t...

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Abstract

The invention discloses a method for suppressing harmonic-wave interference existed in an original seismic record of controllable land seismic source excitation acquisition. Method is characterized by: taking a related previous earthquake data to carry out short-time Fourier transform and transforming a time domain signal to a time-frequency domain; taking a time sampling sequence number and a frequency sampling sequence number in a related previous time-frequency domain signal as two coordinate axes of a rectangular coordinate, carrying out coordinate transformation so that a fundamental wave is parallel to a time axis; separating the harmonic wave interference from the signal, carrying out coordinate inverse transformation of the time-frequency domain and carrying out short-time Fourier inverse transform so as to acquire time domain data which can remove the harmonic wave interference; after all unrelated seismic data collected from a filed is processed, acquiring the related seismic data after the harmonic wave interference is suppressed. By using the method of the invention, disadvantages of a filtering method in a frequency wave number domain can be avoided. Through the controllable seismic source, the seismic data with high qualities can be collected.

Description

technical field [0001] The invention relates to a petroleum seismic exploration data collection technology, and is a method for suppressing harmonic interference existing in original seismic records excited and collected by a vibrator on land. Background technique [0002] The first step in oil seismic exploration data acquisition is to use artificial methods to excite seismic waves. There are some basic requirements for the excitation of seismic waves. However, in order to adapt to various surface conditions and the characteristics of specific working methods, the used seismic sources and excitation methods are varied. The energy for exciting seismic waves must be strong enough, because in oil exploration, seismic reflection is used to find out the structural form of a set of formations in the depth range of several kilometers underground. Seismic waves start from the source, travel underground and then reflect back to the ground. To travel such a long distance, there is ...

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Application Information

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IPC IPC(8): G01V1/36
Inventor 夏建军唐东磊郭勇
Owner BC P INC CHINA NAT PETROLEUM CORP
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