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Linear-scanning-based method for improving recognition capability of thin interbed

A technology with linear scanning and recognition capabilities, applied in seismic signal processing and other directions, can solve problems such as lack of low-frequency information

Active Publication Date: 2019-01-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Conventional methods have the problem of lack of low-frequency information, but the vibroseis can be excited by "long-term, small-energy signals" through frequency scanning, and equivalently output "short-time, large-energy signals"

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  • Linear-scanning-based method for improving recognition capability of thin interbed
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  • Linear-scanning-based method for improving recognition capability of thin interbed

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Embodiment Construction

[0047] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below, and are described in detail in conjunction with the accompanying drawings.

[0048] Such as figure 1 as shown, figure 1 It is a flow chart of the method for improving thin interlayer recognition ability based on linear scanning in the present invention.

[0049] In step 101, the forward modeling of seismic data is carried out first, and the basic characteristics of thin layers are analyzed to provide a theoretical basis for the identification of thin layers in actual data; the dominant frequency range and phase information of seismic data are obtained by analyzing the frequency spectrum and waveform characteristics of seismic data.

[0050] Step 102, using the complex spectrum to extract the wavelet of the target seismic record, and adjusting the frequency band and phase of the obtained wavelet by sliding the time win...

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Abstract

The invention provides a linear-scanning-based method for improving the recognition capability of a thin interbed. The method comprises: carrying out spectrum and waveform characteristic analysis on seismic data to obtain a dominant frequency band range and phase information of the seismic data; extracting wavelets of all seismic data by using the complex cepstrum and adjusting obtained wavelet frequency bands and phases; with broadband information of a linear scan signal, sliding a time window and selecting an optimal linear scanning wavelet ; for a single-track record, carrying out wavelet shaping deconvolution by extracting the wavelet and optimal linear scanning wavelet to obtain a shaping operator of a target track; and acquiring a new high-resolution seismic record by using a new composite shaping operator and target seismic recording track convolution. According to the invention, high-precision processing is carried out on the thin layer and thin interbed; according to the broadband characteristics of linear scanning wavelets, bandwidth compensation is reasonably carried out, so that the main frequency is increased and the frequency band range is extended; a high-resolutionseismic profile is obtained; and the recognition ability of the thin layer is improved effectively.

Description

technical field [0001] The invention relates to the technical field of seismic data processing, in particular to a method for improving the recognition ability of thin interbeds based on linear scanning. Background technique [0002] Thin bed and thin interbed oil and gas reservoirs are a very important type of oil and gas reservoirs. Due to the limited ability of seismic data to resolve thin layers, seismic prediction of this type of reservoir is very difficult. Conventional methods have the problem of missing low-frequency information, while vibroseis can be excited by "long-term, small-energy signals" through frequency scanning, and equivalently output "short-time, high-energy signals". Applying this idea to the target processing of thin interlayer data can broaden the frequency band of the data, thereby improving the resolution of thin interlayer and enhancing its recognition ability. It is very important to use a reasonable bandwidth compensation method to finely iden...

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 刘立彬王延光汪浩吕喜滨毕丽飞揭景荣周小平
Owner CHINA PETROLEUM & CHEM CORP
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