基于同步挤压改进短时傅立叶变换的分频蚂蚁追踪在断裂识别中的应用

doi:10.11720/wtyht.2021.1022

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Abstract

Since the application of the time-frequency analysis method in the field of geophysics,it has been favored by geophysicists and is widely used to detect faults and cracks.Therefore,seeking for time-frequency analysis methods with higher precision has become the goal pursued in the field of seismic signal processing.The improved short-time Fourier transform method has low accuracy of time-frequency analysis due to its own window function limitation.In order to improve the time-frequency resolution to a greater extent,the authors squeezed the time-spectrum values after the improved short-time Fourier transform,and developed synchronous extrusion improved short-time Fourier transform.The synthetic signal analysis results show that synchronous squeeze improved short-time Fourier transform has higher time-frequency convergence,and can more accurately characterize the time-frequency characteristics of the signal.The theory shows that the high-frequency components of seismic data can accurately engrave tiny secondary cracks,and ant tracking technology is an effective means to detect crack and fault information.Therefore,based on the high-resolution time-frequency analysis method and the ant tracking technology,the authors predicted the three-dimensional data volume of the South China Sea by cracks.The results show that the method can describe the micro-cracks and associated folds well,and the recognition accuracy is obviously improved as compared with the algorithm of the traditional ant tracking method,thus proving the effectiveness and practicability of the proposed method.

Key words： high resolution time-frequency analysis micro-cracks secondary cracks ant tracking crack prediction associated folds

Received: 15 January 2020 Published: 29 April 2021

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	Articles by authors
	Wei HUANG
	Jie ZHOU
	Li-Jun GAO
	Sheng-Li WANG
	Hai-Tao YAN

Cite this article:

Wei HUANG,Jie ZHOU,Li-Jun GAO, et al. The application of frequency division ant tracking based on synchronous extrusion improvement of short time Fourier transform in crack detection[J]. Geophysical and Geochemical Exploration, 2021, 45(2): 432-439.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1022 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I2/432

Improved ant tracing process framework of short-time Fourier transform based on synchronous extrusion

Synthesized signal and time spectrum obtained by different analysis methods
a—original synthesized signal;b—time frequency spectrum of short time Fourier transform;c—improved time frequency spectrum of short time Fourier transform;d—synchronous to improve time frequency spectrum of short time Fourier transform

Noise-added signal and time spectrum obtained by different analysis methods
a—original noise signal;b—time frequency spectrum of short time Fourier transform;c—improved time frequency spectrum of short time Fourier transform;d—synchronous to improve time frequency spectrum of short time Fourier transform

Original seismic record and single frequency profile
a—original seismic signal;b—improved short time Fourier transform single frequency profile;c—single channel cycle squeeze to improve short time Fourier transform single frequency profile;d—multi channel cycle squeeze to improve short time Fourier transform single frequency profile

Seismic trajectory by the well and the time spectrum obtained by different analysis methods
a—single channel seismic record near the well;b—time frequency obtained by short time Fourier transform;c—synchronous squeezing to improve the time spectrum obtained by short time Fourier transform

Amplitude slice along the layer

Full-band ant slice along the layer

25 Hz ant slice along the layer

55 Hz ant slice along the layer

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