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Method for eliminating harmonic interference of earthquake data

A technology of harmonic interference and seismic data, applied in the fields of development, exploitation, and oilfield exploration, which can solve the problems of time-consuming and slow speed.

Active Publication Date: 2011-05-25
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the two parameters of frequency and time delay of harmonic interference are obtained by scanning, the calculation speed is relatively slow, especially when the amount of data is large, it is very time-consuming

Method used

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  • Method for eliminating harmonic interference of earthquake data
  • Method for eliminating harmonic interference of earthquake data
  • Method for eliminating harmonic interference of earthquake data

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Embodiment Construction

[0097] High-voltage transmission lines or periodic vibrations (such as generators, etc.) will generate periodic harmonic interference near the ground. In the process of seismic data acquisition, if there are high-voltage transmission lines or periodic vibrations (such as generators, etc.) near the ground receiver, the seismic records received by the ground receiver are the superposition of effective seismic signals and harmonic interference. A method for eliminating harmonic interference of seismic data in the present invention is to identify and eliminate harmonic interference in seismic records.

[0098] The invention expresses the harmonic interference as the sum of the cosine function and the sine function with the same frequency and different amplitude, and subtracts it from the record to eliminate the harmonic interference. The frequencies of the cosine and sine functions are estimated by an adaptive method, and the amplitudes of the cosine and sine functions are directl...

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Abstract

The invention claims a method for eliminating harmonic interference of earthquake data, comprising the following steps: according to the original waveform data in the earthquake data, determining the initial frequency of harmonic interference through the oscillation period of the original data and the maximum position of the amplitude spectrum; calculating the amplitude of the harmonic interference cosine function; and according to the earthquake data vector, the amplitude of harmonic interference cosine function, the harmonic interference cosine function vector and the target function derivative, the harmonic interference frequency amendment quantity and the time delay amendment quantity, adopting a frequency modifier formula to determine the harmonic interference frequency; and calculating the effective signal of earthquake. The method overcomes the disadvantage that the frequency domain suppresses the harmonic interference, and is quicker in speed than the time domain harmonic interference suppressing method, thereby improving the signal-to-noise ratio, and being capable of eliminating the harmonic interference in the earthquake data generated by high voltage transmission line and also eliminating the harmonic interference in the earthquake data generated by periodic vibration.

Description

technical field [0001] The invention relates to oil field exploration, development and mining technologies, in particular to a method for eliminating harmonic interference of seismic data that provides high-resolution seismic graphics and data for reflecting underground formation layers and oil reservoir description. Background technique [0002] The process of seismic exploration is to artificially excite seismic waves at a series of points on the ground, and the seismic waves propagate underground. When the wave impedance of the upper and lower strata is unequal surface), the seismic wave reflects on the wave impedance interface, the propagation direction of the seismic wave changes, and the seismic wave begins to propagate upward. Receivers are placed on a series of receiving positions on the ground to receive the upwardly propagating seismic wave data to complete field exploration. [0003] During the field acquisition of seismic data, if the seismic line passes under o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 高少武赵波刘建红程春华祝宽海
Owner BC P INC CHINA NAT PETROLEUM CORP
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