Pre-stack seismic data spectrum expansion method based on angle division processing

A pre-stack seismic and sub-angle technology, applied in the field of seismic exploration data processing, to achieve the effect of expanding, realizing seismic bandwidth, and not compromising the signal-to-noise ratio

CN109782340AInactive Publication Date: 2019-05-21XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-05-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a pre-stack seismic data spectrum expansion method based on angle division processing. The method comprises the following steps: step 01, reading CRP gather data, and dividingthe data into a far angle, a middle angle and a near angle; step 02, setting corresponding ratio parameters at the CRP gather sub-angles in the step 01, and determining a reference frequency and a frequency expansion range for each gather of data in the sub-angles; step 03, performing continuous wavelet transform on each gather of data of the CRP gather sub-angles in the step 02, and converting the data from time domain to time-scale domain; and step 04, expanding the signal bandwidth in the time-scale domain, carrying out inverse transformation of continuous wavelet transformation, reconstructing a spread-spectrum high-resolution time signal, and obtaining CRP gather data after bandwidth expansion; repeating the steps 03 and 04 till finishing processing all gathers of data. By applying the method, the energy information of the high-frequency end and the low-frequency end can be effectively predicted, the seismic signal bandwidth is expanded, the signal resolution is obviously improved, and a high signal-to-noise ratio is kept.
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Description

Technical field

[0001] The invention belongs to the field of seismic exploration data processing, and in particular relates to a method for broadly expanding the frequency spectrum of pre-stack seismic data through angle processing technology. Background technique

[0002] Improving the resolution of seismic data is one of the main tasks of seismic data processing. To obtain a high-resolution seismic profile, it is often necessary to rely on technology to improve resolution processing. Since the post-stack data suppresses the noise, the high-frequency effective information is obviously lost, so the high-frequency expansion capability based on the post-stack seismic data is obviously limited. The pre-stack seismic data is the most primitive record of seismic signals, which contains abundant high-frequency and low-frequency effective information. The profile after pre-stack migration has clear fault imaging, accurate homing, more detailed geological morphology, and better results ...

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Embodiment Construction

[0044] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0045] The present invention provides a pre-stack seismic data spectrum expansion method based on angle processing. First, CRP gather data is divided into far angle, middle angle and near angle, and a ratio parameter is set respectively to determine the reference frequency and the frequency range to be expanded. Then perform continuous wavelet transform on the single-channel seismic data, decompose the seismic trace into the time-scale domain, and expand the bandwidth in the time-scale domain, so that the widened spectrum of each part is more consistent, and finally through the inverse transformation of the continuous wavelet transform , Rebuild the spread spectrum high-resolution time signal.

[0046] See Picture 9 As shown, the present invention provides a pre-stack seismic data expansion method based on angle processing. Steps 01 to 04 are implemente...