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Earthquake gyration analysis method

An analysis method and technology of seismic data, applied in the field of high-resolution processing and interpretation, can solve the problem of unusable

Inactive Publication Date: 2011-08-03
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

Therefore, using windowed FFT for seismic cycle analysis, a result with a large error is obtained, which is almost unusable.

Method used

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Embodiment Construction

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0023] The present invention provides a seismic cycle analysis method based on the Hilbert transform, which uses the Hilbert transform to perform time-frequency analysis and processing on the seismic signals of the seismic section, and then conducts the seismic cycle analysis to study the stratum during the deposition process. The changing law of the , guides the prediction of ultra-thin reservoirs.

[0024] The core idea of ​​the Hilbert transform is to decompose the time series data into multiple intrinsic mode functions (IMF) through Empirical M...

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Abstract

The invention provides a seismic cycle analysis method, comprising the steps of: establishing a seismic sequence model base which includes a plurality of seismic sequence models corresponding to the stratum sequences, each seismic sequence model corresponding to a group of reflection coefficient series and a time-frequency analysis chart; performing band-pass filter for the reflection coefficient series; carrying out Hilbert transform and decomposing the reflection coefficient series to different frequency band ranges through empirical mode decomposition; scanning the frequency, dividing seismic facies according to frequency characteristics of the reflected wave; performing the empirical mode decomposition for seismic data of a target stratum, and obtaining time-frequency response thereof; searching models which have corresponding relation with the seismic sequence model base according to the time-frequency response of the seismic data of the target stratum, futher determining the reflected characteristics of the target stratum. The invention utilizes Hilbert to analyze seismic section to obtain accurate and reliable frequency spectrum, and can obtain effective information which is not displayed for the original sections after decomposition so as to provide data for reservoir predication.

Description

technical field [0001] The present invention relates to a high-resolution processing and interpretation method in seismic exploration, in particular to a seismic cycle analysis method based on Hilbert transform (HHT: Hilbert-Huang Transform). Background technique [0002] At present, the known seismic cycle analysis is all based on window Fast Fourier Transform (FFT, FastFourier Transform), which requires a fixed time window length. Once the time window length is determined, it cannot be changed, and the length of the time window is only for a certain frequency f 0 Correct, the frequency f 0 is the frequency corresponding to the window. For ratio f 0 High frequency, the window is too large; for ratio f 0 For small frequencies, the window is too small. Therefore, the length of the fixed time window is not highly adaptable to signals, and cannot be applied to non-stationary signals. [0003] Since the length of the time window can only correspond to a certain frequency f ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 曹思远
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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