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Seismic source nonlinear scanning signal design method based on forced vibration

A nonlinear scanning and forced vibration technology, applied in the field of geophysical exploration, which can solve the problems of poor signal design accuracy and no consideration of surface conditions.

Pending Publication Date: 2021-05-07
CHINA PETROCHEMICAL CORP +2
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for designing a nonlinear scanning signal of a seismic source based on forced vibration, so as to solve the problem that the currently designed nonlinear scanning signal does not consider the ground surface conditions, resulting in poor signal design accuracy.

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  • Seismic source nonlinear scanning signal design method based on forced vibration
  • Seismic source nonlinear scanning signal design method based on forced vibration
  • Seismic source nonlinear scanning signal design method based on forced vibration

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Embodiment Construction

[0042] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0043] like figure 2 As shown, the forced vibration is that the vibration system is under the periodic external force, and the vibration that occurs is called forced vibration. The resonant (resonant) frequency is the inherent property of the forced vibration system. The forced vibration has the following regular characteristics :

[0044] when f 驱 =f 固 , the system reaches the resonance state A=A m ; f 驱 with f 固 The closer, the larger the amplitude of the forced vibration; f 驱 with f 固The farther the difference is, the smaller the amplitude of the forced vibration is; when resonance occurs, within one cycle, the energy provided by the outside is equal to the energy consumed by the system to overcome resistance and do work.

[0045] During the vibration process, the part of the vibroseis that is directly affected by the flat plate ...

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Abstract

The invention relates to a seismic source nonlinear scanning signal design method based on forced vibration, and belongs to the technical field of geophysical exploration. According to the method, the actual earth surface condition is considered, a target frequency-energy value is determined according to the vibration characteristic information of a near-surface forced vibration system during scanning excitation of a vibroseis, so that the frequency change rate, the instantaneous frequency, the instantaneous phase and the instantaneous output data of nonlinear scanning signals are determined, and design of the nonlinear scanning signals of the vibroseis is achieved. The method can effectively adapt to different earth surfaces, enhance the construction adaptability of the vibroseis in a complex environment, meanwhile, can effectively improve the signal-to-noise ratio of vibroseis construction data; and the method is closer to practical production application.

Description

technical field [0001] The invention relates to a design method of a seismic source nonlinear scanning signal based on forced vibration, and belongs to the technical field of geophysical exploration. Background technique [0002] During the construction of vibroseis seismic data acquisition, the scanning signal excites seismic waves through the vibrator electric control system and hydraulic control system to drive the vibration system. The scanning signal is one of the key factors affecting the quality of seismic waves. Seismic waves propagate through the ground to the acquisition system of ground instruments, and are correlated by scanning signals to form a single-shot record. Due to the filtering effects of geophones, instruments, and ground absorption attenuation, the frequency spectrum of the obtained seismic records is narrowed and tends to be low-frequency, and these effects cannot be artificially changed. [0003] There are two types of vibroseis scanning signals: li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/02
CPCG01V1/02
Inventor 田新琦碗学俭张伟王宁许亚博康智清曹志刚刘明王永平师晨旭冯丽华
Owner CHINA PETROCHEMICAL CORP
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