Method for eliminating single-frequency interference of earthquake data
A technology of single-frequency interference and seismic data, which is applied in the fields of development, oilfield exploration, and exploitation, and can solve a large number of problems such as invalid calculation and storage space.
Active Publication Date: 2011-05-25
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
For a typical record of 2ms sampling, the accuracy requirement of 0.001Hz means that N must not be less than 524288 (that is, k must not be less than 19)! ! ! In fact, all that is needed is a limited narrow-band spectrum centered on the estimated frequency. In the conventional FFT method, a large amount of calculation and storage space is ineffective.
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[0140] The invention expresses single-frequency interference as the sum of cosine function and sine function with different amplitudes at the same frequency, and subtracts it from the record to eliminate single-frequency 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 directly calculated.
[0141] The present invention comprises the following steps:
[0142] 1) Using a seismic source to excite and collect seismic data and perform preprocessing. The preprocessing refers to labeling the seismic data and defining an observation system.
[0143] 2) Determine the initial frequency of single-frequency interference. Using spectrum analysis method to analyze the original waveform data x in seismic data i Spectrum of , according to the original waveform data x in the seismic data i and its amplitude spectrum, the initial frequency f of the single-frequency interference in the ...
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The invention relates to the technical field of exploiting, developing and mining oil field, in particular to a method for eliminating single-frequency interference of earthquake data. The method comprises the following steps: determining sampling frequencies with unequal intervals through rapid frequency scanning algorithm; calculating the frequency sampling linear frequency modulation spectrum frequency sample of unequal interval frequency and linear frequency modulation spectrum sample; determining the frequency corresponding to the largest value in the linear frequency modulation spectrum frequency spectrum sample as the frequency of single-frequency interference; calculating the earthquake efficient signal after eliminating the single-frequency interference according to single-frequency interference amplitudes of cosine function and sine function and time sampling interval recorded by earthquake. The method has rapid speed without damaging efficient wave, thereby improving signal-to-noise ratio of frequency component; and the method also can eliminate the single-frequency interference generated by periodical vibration in earthquake data.
Description
technical field [0001] The invention relates to oil field exploration, development and mining technology, in particular to a method for eliminating single-frequency interference of seismic data by providing 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. During field seismic data acquisition, if there are high-voltage transmission lines ...
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IPC IPC(8): G01V1/36
Inventor 高少武罗国安
Owner BC P INC CHINA NAT PETROLEUM CORP