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Instantaneous phase gradient attribute extraction method based on ocean broadband seismic data waveform

A technology of instantaneous phase and seismic data, applied in the field of petroleum exploration and development, can solve problems such as ignoring the corresponding relationship of phase discontinuity characteristics, achieve the effect of stable phase characteristics, improve signal-to-noise ratio, and improve resolution

Active Publication Date: 2020-06-23
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

Marine seismic data are generally affected by ghost waves, and the sidelobe effect of seismic wavelets will cause obvious multiple solutions to the phase discontinuity feature. Therefore, deconvolution must be performed when using the instantaneous phase attribute of conventional data to obtain the instantaneous frequency winding processing, thus ignoring the corresponding relationship between the phase discontinuity feature and the sequence interface

Method used

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  • Instantaneous phase gradient attribute extraction method based on ocean broadband seismic data waveform
  • Instantaneous phase gradient attribute extraction method based on ocean broadband seismic data waveform
  • Instantaneous phase gradient attribute extraction method based on ocean broadband seismic data waveform

Examples

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Effect test

Embodiment 1

[0046] figure 1 and figure 2 It is the result of the method without using broadband seismic data, that is, the effect analysis of different polarity wavelets without using broadband seismic data. figure 1 is the instantaneous phase gradient attribute graph calculated by the positive polarity Riker wavelet with a main frequency of 35Hz, where figure 1 (a) is a zero-phase positive Ricker wavelet with a main peak and two obvious side lobes; figure 1(b) is the instantaneous phase obtained after the Hilbert transform of the wavelet, and the winding phenomenon of the phase from π to -π appears at the position of the side lobe of the corresponding wavelet, and two discontinuous change points appear; figure 1 (c) is the instantaneous phase gradient attribute after obtaining the first derivative of the instantaneous phase by retaining the phase winding phenomenon. Two false discontinuous interfaces appear at the corresponding wavelet side lobe positions, indicating the wavelet side ...

Embodiment 2

[0052] Such as Figure 7 As shown, it is an example of calculating seismic signals fitted by different wavelets, and this embodiment is used to illustrate the advantages of calculating instantaneous phase gradient attributes based on broadband seismic data. Figure 7 (a) is the reflection coefficient of the formation, corresponding to three reflection coefficients at the positions of time 250ms, 350ms and 450ms respectively, and the reflection coefficient values ​​are: -0.5, 0.2, -0.4; figure 1 (a), image 3 (a) and Figure 5 The positive polarity wavelet in (a) is convolved with the reflection coefficient to obtain the corresponding seismic trace data and calculate its corresponding instantaneous phase gradient attribute. Figure 7 (b) is the reflected seismic signal synthesized by the 35Hz positive polarity Rake wavelet, Figure 7 (c) is the instantaneous frequency attribute calculated by the conventional method. Because the conventional method performs unwrapping process...

Embodiment 3

[0054] Adopt the conventional method and the method of the present invention to survey and map the seismic section and the instantaneous attribute section somewhere, the result is as follows Figure 8 (a)~ Figure 8 (f) shown. in, Figure 8 (a) is the seismic section acquired by conventional horizontal streamers and processed conventionally; Figure 8 (b) is the instantaneous frequency attribute profile calculated by conventional methods on conventional data. It can be seen that the resolution is very low, and it is difficult to see the development characteristics of waterways; Figure 8 (c) is an instantaneous phase gradient attribute profile calculated based on conventional data using the method proposed by the present invention. Due to the interference of ghost waves in conventional seismic data, the position of the discontinuous interface does not have a good correspondence with the stratigraphic sequence interface , there are obvious multiple solutions in the calculati...

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Abstract

The invention relates to an instantaneous phase gradient attribute extraction method based on an ocean broadband seismic data waveform. The method comprises the steps: collecting original seismic datathrough an inclined cable, carrying out ghost wave suppression, and obtaining broadband seismic data; performing Hilbert transform on the broadband seismic data, and calculating to obtain an instantaneous phase attribute; keeping a winding phenomenon of the instantaneous phase, and solving a first-order derivative about time for the instantaneous phase to obtain an instantaneous phase gradient; and performing sequence interface identification by utilizing an instantaneous phase gradient. The method can be widely applied to ocean broadband seismic data, a resolution capability of an underground sequence interface is effectively improved, and interpretation multiplicity is reduced. The method can be widely applied to a marine oil and gas exploration process.

Description

technical field [0001] The invention relates to the field of petroleum exploration and development, in particular to a method for extracting instantaneous phase gradient attributes based on waveform characteristics of marine broadband seismic data. Background technique [0002] In recent years, the seismic data acquisition and supporting processing technology of marine deep-water inclined cables have made great progress, and the frequency band range of seismic data has been greatly expanded. Broadband seismic data can not only improve the imaging accuracy of complex underground structures and the accuracy of seismic inversion results, but also have significant advantages in sedimentary sequence interpretation and reservoir parameter prediction. However, in the process of practical application, the potential of broadband seismic data is far from being fully explored, mainly because the interpretation and attribute calculation methods of broadband seismic data still continue t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/307G01V2210/63
Inventor 刘春成叶云飞张益明焦振华牛聪黄饶
Owner CHINA NAT OFFSHORE OIL CORP
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