CN105158799B - The identification of physical detecting echo-signal and extracting method based on phase criterion - Google Patents
The identification of physical detecting echo-signal and extracting method based on phase criterion Download PDFInfo
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Abstract
The present invention relates to a kind of identification of physical detecting echo-signal and extracting method based on phase criterion, this method comprises: 1) carrying out Hilbert transform to echo-signal obtains corresponding analytic signal: 2) according to the instantaneous value for accordingly parsing available phase theta (t)；3) phase compensation is done to the instantaneous phase information of signal, extracts preliminary abnormal；4) wavelet transformation, the accurate exception information extracted in original waveform are carried out to the signal of preliminary anomaly extracting.The identification of physical detecting echo-signal and extracting method based on phase criterion in the present invention, it can be under conditions of identical seismic source energy, it is accurate to pick up the echo information from stratum deeper inside, and relatively accurately extract the echo information of weak reflector, and it is precisely separating, extracts the echo information of thin layer top, bottom surface, aftershock can also be effectively suppressed simultaneously, reduces the influence of multiple wave.
Description
Technical field
The present invention relates to the identification of physical detecting echo-signal and extraction, specifically a kind of object based on phase criterion
Reason detection echo-signal identification and extracting method.
Background technique
Currently, with the continuous improvement of seismic exploration extent, exploration object becomes increasingly complex hidden, such as buries depth, face
Product is small, Reservoir Body that thickness is thin, often corresponds to weak reflection even areflexia on common seismic section, objective body signal substantially by compared with
Strong background signal is flooded.Especially river channel sand, thin reservoir and further object etc., generated reflection weak output signal.
It thus needs to carry out processing and prediction work for seismic reflection weak signal, to improve weak signal exploration targets precision of prediction, from
And meet exploration demand.
It is well known that either which kind of signal (elastic wave, sound wave or electromagnetic wave) is all with its phase, frequency
Three rate, amplitude characteristic quantities characterize.It all the time, is all to identify echo-signal using amplitude criterion both at home and abroad.But it should
The following limitations exist for kind of method: first, attenuation ratio is very fast when seismic wave is propagated in underground medium, when signal-to-noise ratio < < 1 when, together
The identification of phase axis difficulty, this method will fail；Second, echo-signal is influenced very seriously by aftershock；Third, to the echo-signal of thin layer
Identification is difficult；Fourth, being identified to the echo-signal of weak reflector difficult.
Summary of the invention
In view of the deficiency of above-mentioned existing method, present invention aims to overcome that the deficiency of above-mentioned existing method and one kind is provided
Tracer signal and its instantaneous parameters, effective with the strong reflection signal of high accuracy and weak signal recognition capability can be analyzed simultaneously
Identification and extracting method.
The object of the invention is realized the technical solution adopted is that a kind of physical detecting echo-signal identification based on phase criterion
With extracting method, this method comprises:
1) Hilbert transform is carried out to echo-signal and obtains corresponding analytic signal:
X (t) is the real part of its analytic signal Z (t),It is the imaginary part of the Z (t) obtained by Hilbert transform；
2) according to the instantaneous value for accordingly parsing available phase theta (t)；
3) phase compensation is done to the instantaneous phase information of signal, extracts preliminary abnormal；
4) wavelet transformation, the accurate exception information extracted in original waveform are carried out to the signal of preliminary anomaly extracting.
The identification of physical detecting echo-signal and extracting method based on phase criterion in the present invention, can be in identical focus energy
It is accurate to pick up the echo information from stratum deeper inside under conditions of amount, and relatively accurately extract the echo letter of weak reflector
Breath, and it is precisely separating, extracts the echo information of thin layer top, bottom surface, while can also effectively suppress aftershock, reduce the shadow of multiple wave
It rings.
Detailed description of the invention
Fig. 1 is that the present invention is based on the flow charts of the physical detecting echo-signal of phase criterion identification and extracting method.
Fig. 2-1 is echo-signal waveform diagram, and Fig. 2-2 is the waveform diagram of up time phase, and Fig. 2-3 is to extract preliminary abnormal wave
Shape figure, Fig. 2-4 are the waveform diagram carried out after wavelet transformation to the signal of preliminary anomaly extracting.
Fig. 3-1 is laminate structure schematic diagram, and Fig. 3-2 is signal processing schematic diagram.
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
As shown in Figure 1, the present invention is based on the identification of the physical detecting echo-signal of phase criterion and extracting method, including it is as follows
Step:
S100, corresponding analytic signal is obtained to echo-signal (as shown in Fig. 2-1) progress Hilbert transform:
X (t) is the real part of its analytic signal Z (t),It is the imaginary part of the Z (t) obtained by Hilbert transform.
S200, basis accordingly parse the instantaneous value of available phase theta (t)；
The waveform of up time phase is as shown in Fig. 2-2.
S300, phase compensation being done to the instantaneous phase information of signal, extracting preliminary exception, waveform is as Figure 2-3.
S400, wavelet transformation, the accurate exception information extracted in original waveform, example are carried out to the signal of preliminary anomaly extracting
Such as extract reflection coefficient to illustrate thin subsurface layer information, as in Figure 2-4.
The present invention is to identify echo-signal based on phase criterion, to thin subsurface layer resolution capability with higher, such as
Shown in Fig. 3, Fig. 3-1 is laminate structure, for thin layer, if two reflection signals on top, bottom surface are combined with each other, and Wo Men
It is difficult to separate them on time shaft, here it is differentiate the highly difficult reason of thin layer.But the present invention is added using phase information
Upper small echo processing, it will be able to reduce a wave shared space on a timeline, and be isolated and come.Waveform a in Fig. 3-2
It is the original signal being combined with each other by the reflection signal of top and bottom two, waveform b is to waveform a by above-mentioned steps
The instantaneous phase spectrum that Hilbert transform obtains in S100；T in waveform c in positive arrow and negative sense arrow, with waveform aTopWith
tBottomIt is corresponding, the as top of thin layer, bottom interface, to realize resolution thin layer.
Using the method for the present invention, the reflection signal new for one, regardless of how faint it is, as long as it exists, although
It can not be gone to differentiate where is it with energy, but accurately its " looking for " is come out using its phase information by the method for the invention,
Here it is the superiority of phase criterion.
Claims (1)
1. a kind of identification of physical detecting echo-signal and extracting method based on phase criterion characterized by comprising
1) Hilbert transform is carried out to echo-signal and obtains corresponding analytic signal:
X (t) is the real part of its analytic signal Z (t),It is the imaginary part of the Z (t) obtained by Hilbert transform；
2) according to the available instantaneous phase θ (t) of the real and imaginary parts of Z (t)；
3) phase compensation is done to the instantaneous phase θ (t) of signal, extracts preliminary abnormal；
4) wavelet transformation, the accurate exception information extracted in original waveform, the exception are carried out to the signal of preliminary anomaly extracting
Information includes the time of echo-signal, directional information, exception obtained in temporal information, that is, treatment process of the echo-signal
Point temporal information, the directional information are greater than zero with another minus abnormal point to judge by one.
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| CN109359633B (en) * | 2018-12-10 | 2021-12-07 | 西北工业大学 | Signal joint classification method based on Hilbert-Huang transform and wavelet ridge line |
| CN109765617B (en) * | 2019-01-31 | 2021-03-02 | 太原理工大学 | Method for suppressing multiple reflection refraction wave by vertical double seismic sources based on kinematics |
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| CN101545984A (en) * | 2009-05-05 | 2009-09-30 | 中国石油集团西北地质研究所 | Seismic coherence algorithm based on wavelet transformation |
| CN102053276A (en) * | 2009-10-30 | 2011-05-11 | 中国石油化工股份有限公司 | Two-dimensional filtering method for a plurality of gathers of digital seismic signal |
| CN104570087B (en) * | 2013-10-29 | 2017-05-10 | 中国石油天然气集团公司 | Method for performing seismic data first break and event pickup extraction through instantaneous attributes |
| CN103645504A (en) * | 2013-12-17 | 2014-03-19 | 中国海洋石油总公司 | Weak earthquake signal processing method based on generalized instantaneous phase and P norm negative norm |
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| 基于于希尔伯特-黄变换的探地雷达信号处理与分析;余凯;《中国优秀硕士学位论文全文数据库 基础科学辑》;20110215(第02(2011)期);第A011-55页 * |
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