Electromagnetic-type vibroseis seismic signal detection method
A detection method and seismic signal technology, applied in the direction of seismic signal receivers, etc., can solve the problems that the excitation signal cannot be directly measured and the quality of signal detection is degraded, and achieve the effect of improving the signal-to-noise ratio of the detection results and good coupling
Inactive Publication Date: 2012-08-15
JILIN UNIV
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According to the relevant detection principle, the reference signal should be the actual excitation signal of the seismic source, but the excitation signal cannot be directly measured
The commonly used cross-correlation detection method uses the control signal of the source control system or the seismic signal collected near the base plate as the reference signal. Due to the dissimilarity between the two and the actual excitation signal, when the coupling between the source and the ground is not good or the underground structure is complex, Signal detection quality degradation
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[0021] Below in conjunction with accompanying drawing and embodiment for further detailed description:
[0022] The electromagnetic vibrator seismic signal detection method based on excitation signal estimation, through the analysis of the geophone signal near the substrate, using the inconsistency of arrival time of various seismic waves, extracts the direct wave signal, and then through inverse filtering processing, to estimate the actual excitation signal of the seismic source the goal of.
[0023] Taking the data acquisition of a single shot point in a certain metal mine in Liaoning as an example, the vibration source seismic signal excitation and the signal acquisition process near the substrate related to the present invention are explained, the characteristics of the signals near the substrate are systematically analyzed, and a detection method for the excitation signal of the seismic source is proposed .
[0024] An electromagnetic vibrator seismic signal detection me...
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The invention relates to an electromagnetic-type vibroseis seismic signal detection method. When electromagnetic-type vibroseis seismic data is collected in an exploration area, a wave detector position is selected on the presence that the single received by the wave detector is not saturated; and according to deconvolution operation, the related detection is carried out on the single shot record of the vibroseis to obtain an earthquake record comprising an seismic subwave. An experiment proves that the electromagnetic-type vibroseis seismic signal detection method is suitable for the detection process of any electromagnetic-type vibroseis seismic data and is especially suitable for detecting vibroseis seismic signal under the situations that the vibroseis is poorly coupled with the ground, or the geologic body structure is complex and the exploration condition is poor. Compared with the existing mutual correlation detection method which takes the seismic control signal and the substrate neighbouring signal as relevant reference signals, the electromagnetic-type vibroseis seismic signal detection method is characterized in that a signal to noise ratio is obviously improved, and especially the problem that a mine can not be found with an earthquake exploration method in the metal mine area because of low signal to noise ratio can be solved; and the earthquake exploration can be used for collecting the earthquake data in the metal mine area and finding the mineral deposits.
Description
Technical field: [0001] The invention relates to an electromagnetic vibrator seismic signal detection method, in particular to an electromagnetic vibrator seismic signal detection method based on excitation signal estimation. Background technique: [0002] The existing electromagnetic vibrator seismic exploration method has received more and more attention in seismic exploration due to its non-destructiveness to the environment. The main problem of vibrator seismic exploration is that the source energy is weak and the background noise is strong, so the signal-to-noise ratio of the received data is low. Therefore, it is of great significance to study high-precision vibrator seismic signal detection methods. At present, the detection of vibroseis seismic signals generally adopts the cross-correlation detection method, and cross-correlation detection requires the selection of appropriate correlation reference signals. According to the relevant detection principle, the referenc...
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IPC IPC(8): G01V1/16G01V1/20
Inventor 姜弢杨志超林君徐学纯贾海青
Owner JILIN UNIV