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Series-type seismic signal optimization time frequency transformation method

A seismic signal, time-frequency transformation technology, applied in seismic signal processing, seismology, geophysical measurement, etc., can solve the problems of low identification and utilization of high and low frequency weak amplitude information, less information utilization, etc., to eliminate human subjective influence factor, high computational efficiency, and the optimal effect of energy aggregation

Active Publication Date: 2017-04-05
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

Conventional time-frequency analysis methods often only use the seismic information within the passband, and seldom use the information outside the cutoff frequency and frequency limit, especially when the amplitude information of seismic signals changes greatly, for those high and low frequency weak amplitude information identify and utilize fewer

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  • Series-type seismic signal optimization time frequency transformation method
  • Series-type seismic signal optimization time frequency transformation method
  • Series-type seismic signal optimization time frequency transformation method

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Embodiment Construction

[0039] In order to achieve the above object, the present invention adopts the following technical solutions: a serial seismic signal optimization time-frequency transformation method, which includes the following steps: 1) input the original seismic trace x(t); 2) use the complete set empirical mode decomposition to The original seismic trace is decomposed into multiple intrinsic mode function (IMF) narrowband signal components of different frequency bands, and each IMF narrowband signal component is used as a new input signal imt i (t); 3) Find each new input signal imt i (t) main frequency f d , and according to the objective function of the energy optimal criterion, the position of each frequency domain window function and its optimal parameter γ opt ; 4) Use the optimized time-frequency distribution calculation formula to calculate each new input signal imt in turn i (t) Time-Frequency Distribution Spectrum TFR i (t, f); 5) Superimpose each time-frequency distribution spe...

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Abstract

The invention discloses a series-type seismic signal optimization time frequency transformation method, which relates to an oil exploration data processing and interpretation technology. Complete set empirical mode decomposition is used for decomposing an original seismic trace x(t) to a plurality of different bands of intrinsic mode function (IMF) signal components, each signal component serves as a new input signal imf(t), an energy optimization criterion objective function is then used for solving the optimal frequency domain window parameter, an optimization time frequency distribution calculation formula is used for sequentially solving the time frequency distribution TFR(t, f) for each newly-inputted signal, and finally, the obtained time frequency distribution is overlapped to obtain a seismic signal time frequency spectrum TFR(t, f) with the time frequency resolution improved obviously. The technology makes full use of effective information of seismic exploration data, the time frequency resolution is high, the calculation speed can be improved exponentially, the information utilization rate in the seismic exploration data is improved, and the seismic data interpretation reliability is also improved.

Description

technical field [0001] The invention relates to the field of petroleum seismic exploration data processing and interpretation, and solves the problems of low resolution and energy aggregation existing in other conventional time-frequency transformation methods through a serial seismic signal optimization time-frequency transformation method, and improves time-frequency resolution. The aggregation of frequency and time-frequency energy in the time-frequency plane can effectively improve the ability to extract stratigraphic structures from time-frequency domain seismic signals, and can be used as a reliable time-frequency transformation technology in seismic signal processing. Background technique [0002] The time-frequency transform method is one of the important methods for directly applying seismic data to hydrocarbon monitoring, and it is also an important step in seismic signal processing. The time-frequency transformation method aims to express a one-dimensional time si...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/28G01V2210/40
Inventor 陈学华贾江锋蒋伟罗鑫张杰蒋帅帅张传良
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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