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Amplitude gain method and processing terminal based on Hilbert transform

A technology for processing terminals and amplitudes. It is used in seismic signal processing, geophysical measurement, seismology, etc. It can solve problems such as formation energy imbalance, and achieve the effect of high computing efficiency and remarkable processing effect.

Active Publication Date: 2020-03-27
GUANGZHOU MARINE GEOLOGICAL SURVEY
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Problems solved by technology

[0010] The second object of the present invention is to provide a processing terminal, which can solve the problem of energy imbalance from shallow to deep in the formation, effectively highlight the effective reflected energy in deep layers, avoid the whitening phenomenon of the profile caused by conventional AGC, and retain the phase-frequency characteristics , which can be better used for geological structure interpretation

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  • Amplitude gain method and processing terminal based on Hilbert transform
  • Amplitude gain method and processing terminal based on Hilbert transform
  • Amplitude gain method and processing terminal based on Hilbert transform

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Embodiment Construction

[0060] Below, in conjunction with accompanying drawing and specific embodiment, the present invention is described further:

[0061] like Figure 2 to Figure 3 Shown, a kind of amplitude gain method based on Hilbert transform, it comprises the following steps carried out in sequence:

[0062] Step S1: Preprocessing the obtained raw seismic data according to the following sub-steps: spherical diffusion compensation, noise removal, surge static correction, air bubble removal, multiple wave suppression and signal enhancement, etc. Of course, in the actual processing , one or more of the above processing procedures can be selected according to the actual seismic data, and after preprocessing, a high-SNR and high-resolution pre-stack gather can be obtained;

[0063] Step S2: Extract the envelope amplitude and phase value of the pre-stack gather, using the following methods:

[0064] The analytical signal Z(t) of seismic waves can be expressed in the form of complex traces, and Z(...

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Abstract

The invention relates to an amplitude gain method based on Hilbert transform and a processing terminal. The method comprises the following steps of: S1, preprocessing the original seismic data; S2, extracting an envelope amplitude and a phase value of the preprocessed data; S3, separating out a principal component and a singular value component of the envelope amplitude to acquire an average amplitude value of the envelope amplitude in the S2, and separating out the envelope amplitude acquired in the S2 according to the average amplitude value; S4, calculating a weight w value; and S5, constructing a new envelope amplitude to calculate a seismic trace amplitude after the gain. According to the amplitude gain method based on Hilbert transform and the processing terminal, the envelope amplitude is acquired based on the Hilbert transform, the envelope amplitude is reinforced or weakened, the phase frequency characteristic is retained, the amplitude value of the seismic trace after the gain is balanced by shallow to deep energy levels, and the method can be better applied to the geological structure interpretation; the blank phenomenon generated by conventional AGC is avoided, the lineups which are otherwise difficult to identify are displayed, the calculation efficiency is high, and the processing effect is remarkable.

Description

technical field [0001] The invention relates to the technical field of seismic data processing, in particular to an amplitude gain method based on Hilbert transform and a processing terminal. Background technique [0002] With the rapid development of seismic exploration technology, fine seismic processing technology is the current development trend. Amplitude-based interpretation technology is widely used in seismic exploration of oil and gas, hydrate, mineral resources, etc. Therefore, in seismic data processing, how to correctly restore The amplitude value is very important. However, the seismic records we actually record are affected by factors such as wavefront diffusion, transmission loss, ground absorption, scattering, and inconsistent excitation and acceptance conditions, so the attenuated event is blurred and difficult to identify. [0003] At present, there are many methods for recovering amplitude, among which automatic gain control (AGC) is one of the important ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/301G01V2210/48G01V2210/512
Inventor 刘玉萍张宝金
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY
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