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Amplitude spectrum method for automatically calculating seismic data cable coupling noise intensity degree

A seismic data and coupled noise technology, applied in the field of seismic exploration data processing, can solve the problems of inaccuracy, lack of accuracy, and inability to determine the strength of data, and achieve the effect of good noise suppression results

Active Publication Date: 2017-12-05
XI AN JIAOTONG UNIV
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Problems solved by technology

[0007] 1. The index determined by this method is a subjective estimate, which is not precise enough and lacks in accuracy
[0008] 2. This method determines an index of comprehensive strength and weakness for multi-channel data, and cannot determine the strength and weakness of each channel of data

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  • Amplitude spectrum method for automatically calculating seismic data cable coupling noise intensity degree
  • Amplitude spectrum method for automatically calculating seismic data cable coupling noise intensity degree
  • Amplitude spectrum method for automatically calculating seismic data cable coupling noise intensity degree

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Embodiment Construction

[0053] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] The invention is an amplitude spectrum method for automatically calculating the intensity of seismic data optical cable coupling noise, by converting single-channel seismic data from the time domain to the frequency domain, and calculating the variance or kurtosis of the normalized amplitude spectrum, and combining the The value is used as an index to measure the strength of optical cable coupling noise.

[0055] see Figure 15As shown, the present invention is an amplitude spectrum method for automatically calculating the intensity of seismic data optical cable coupling noise, and implements steps 01-04 for seismic recording signals, specifically including:

[0056] Step 01: Read the single-channel data recorded by the VSP collected by the DAS;

[0057] Step 02: Perform Fourier transform on the single-channel data read in st...

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Abstract

The invention discloses an amplitude spectrum method for automatically calculating a seismic data cable coupling noise intensity degree. The method comprises steps that step 01, single-channel data which is acquired by a DAS and is recorded by a VSP is read; step 02, fast Fourier transform of the single-channel data of the step S01 is carried out, and conversion from the time domain to the frequency domain is carried out; step 03, normalization processing on a discrete sampling value X[k] of the frequency domain is carried out; step 04, variance or a peak degree of normalization amplitude spectrum is calculated; and step 05, the steps 01-04 are repeated till all the channel data is processed. The method is advantaged in that a sparse optimization algorithm parameter is selected based on the cable coupling noise intensity degree, cable coupling noise can be adaptively inhibited, an automatic cable coupling noise intensity degree calculation problem in the DAS seismic data can be solved, and accurate single-channel calculation is realized.

Description

technical field [0001] The invention belongs to the field of seismic exploration data processing, in particular to an automatic calculation method for the intensity of optical cable coupling noise. Background technique [0002] Distributed Acoustic Sensing (Distributed Acoustic Sensing, DAS) is a technology that has developed rapidly after its appearance. Its working principle is based on the scattering effect, and it integrates two functions of sensing and transmission, which can realize long-distance detection. and measure. The optical fiber instrument of the DAS system is resistant to electromagnetic interference, high temperature and high pressure, and can repeat the test without moving the downhole instrument, thereby increasing production. The VSP (Vertical Seismic Profile) data recorded by the DAS system is widely used in imaging and formation detection, and the signal-to-noise ratio can meet the requirements of data imaging. [0003] However, since the optical fibe...

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Application Information

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IPC IPC(8): G01V1/28G01V1/32
Inventor 陈文超陈建友师振盛王晓凯刘达伟郭桑陈昕
Owner XI AN JIAOTONG UNIV