Suppression system and method based on multi-signal generator cooperated vibroseis vibration distortion

Abstract

The invention relates to a suppression system and method based on multi-signal generator cooperated vibroseis vibration distortion. The method comprises the steps that an upper computer builds a vibroseis mathematic model through pre-vibration work and sensor feedback signals, and updates the parameters of a vibroseis model in real time; and the total harmonic distortion rate and the signal-to-noise ratio in the vibroseis feedback signal are analyzed, and the corresponding multiple harmonic component amplitudes are calculated. A lower computer main control unit starts the corresponding fundamental frequency signal generator and N auxiliary signal generators, the N auxiliary signal generators output harmonic signals with reversed phases, then higher harmonics contained in feedback signals when the fundamental frequency signal generator works are offset, and fundamental frequency band vibration signal distortion is suppressed. The problem that high-quality standard sinusoidal signals aredifficult to output due to the fact that vibration signals output by a vibroseis are nonlinearly affected by structures such as machinery, hydraulic pressure and electromagnetism is solved. The harmonic distortion of the vibroseis vibration signal can be effectively suppressed.

Description

technical field [0001] The invention belongs to the field of seismic exploration, in particular to a multi-signal generator cooperative seismic controllable [0002] Source vibration distortion suppression system and method. Background technique [0003] Vibroseis is an active source widely used in land oil and gas exploration and other fields, and it is also a generation device for exploration vibration signals. The basic theory of the vibroseis is: use hydraulic, electromagnetic and other driving methods to excite continuous sinusoidal vibration signals with low energy density radiating to the earth; continuous sinusoidal vibration signals form reflection or refraction vibration signals at the interface of different formations; reflection or refraction vibration signals It is picked up by a high-sensitivity detector laid on the surface of the earth to form a recorded signal. Through processing such as cross-correlation between the recorded signal of the geophone and the ...

AI Technical Summary

Problems solved by technology

Although the above-mentioned control system and control algorithm have improved the quality of the vibration signal excited by the vibrator to a certain extent, they are still limited to the excitation control idea of ​​a single signal generator.

However, since a single signal generator can only stimulate a certain sinusoidal signal, the improvement effect is limited

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