Method and device for quickly identifying seismic phase by using controllable vibrating source to excite seismic signals

A seismic signal and seismic source technology, applied in seismic signal processing, seismology, measuring devices, etc., can solve problems such as cross-item interference, failure to meet survey needs well, and large amount of calculations

Active Publication Date: 2018-09-14
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI +1
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Problems solved by technology

For example, some nonlinear transformations will bring serious cross-term interference, which seriously interferes with people's interpretation of the time-frequency characteristics of the signal; in order to suppress the cross-term, the time-frequency resolution has to be sacrificed, and the calculation is huge
In addition, the research on the above method is mainly applicable to nonlinear and non-stationary signals, rather than chirp signals generated by vibrators
In the research on the signals excited by vibroseis, Yang Wei et al. (2013

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  • Method and device for quickly identifying seismic phase by using controllable vibrating source to excite seismic signals
  • Method and device for quickly identifying seismic phase by using controllable vibrating source to excite seismic signals
  • Method and device for quickly identifying seismic phase by using controllable vibrating source to excite seismic signals

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[0070] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0071] The terms "first", "second", "third", "fourth" and the like in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily to describe specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate ...

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Abstract

The invention provides a method and device for quickly identifying a seismic phase by using a controllable vibrating source to excite seismic signals. Fractional order Fourier transform is used to fastly identify the seismic phase of the linear frequency modulation seismic signals excited by the controllable vibrating source, linear properties of traditional Fourier transform are inherited, interference of cross terms in time-frequency analysis can be suppressed, time-frequency distribution characteristics of the linear frequency modulation seismic signals excited by the controllable vibratingsource can be improved, a pulse function is taken as an analysis object, a signal-to-noise ratio of the seismic phase can be improved, and a reliable data foundation can be provided for geological interpretation when the seismic phase is identified.

Description

technical field [0001] The invention relates to the field of seismic exploration, in particular to a method and a device for quickly identifying seismic phases by using a vibrator to excite seismic signals. Background technique [0002] In seismic exploration, observation technology plays a vital role. The precision vibrator can generate frequency-controllable elastic waves. Due to the high frequency accuracy, the geophone can receive signals in a narrow bandwidth; through the precise control of the waveform phase, the signal-to-noise ratio is further improved by using signal superposition technology to achieve a relatively high frequency. Low power for long-distance seismic data acquisition. The precision vibrator device can operate continuously and stably for a long time. Compared with artificial sources such as blasting and hammering, it has great application prospects. [0003] The seismic signal excited by the vibroseis is a linear frequency modulation (LFM) signal, i...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/307G01V2210/63
Inventor 刘康游庆瑜李志伟王宝善姚华建肖雪
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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