Method and device for extracting hybrid-phase seismic wavelets

A seismic wavelet and mixed-phase technology, which is applied in the field of petroleum geophysical exploration, can solve the problems of large influence, difficult selection of control parameters, and low accuracy of spectral estimation, and achieves the effect of improving accuracy.

Active Publication Date: 2011-06-15
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

However, the steepest descent method has two disadvantages as a linear fitting method: the final result is greatly affected by the given initial value, and has a tendency to be similar to the initial value; the result may fall into a local extremum, if the initial value is given inappropriately , the result may have a large error
[0006] In order to reduce the error, Velis and Ulryc proposed a nonlinear fitting method, that is, the simulated annealing method, which can effectively avoid the possibility of the result falling into a local minimum, but the simulated annealing algorithm also has its own shortcomings, such as the control param...

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  • Method and device for extracting hybrid-phase seismic wavelets
  • Method and device for extracting hybrid-phase seismic wavelets
  • Method and device for extracting hybrid-phase seismic wavelets

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[0039] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with 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.

[0040] An embodiment of the present invention provides a method for extracting mixed-phase seismic wavelets, such as figure 1 As shown, the method includes:

[0041] Step 101, calculating the fourth-order cumulant of seismic data;

[0042] Step 102, smoothing the fourth-order cumulant of the seismic data through a three-dimensional lag window function, and estimating the triple spectrum of the seismic wavelet;

[0043] Step 103, extracting the mixed-phase seismic wavelet through the triple spectrum of the seismic wavelet.

[0044] In this embodiment, according to the convolution model, th...

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Abstract

The embodiment of the invention provides a method and device for extracting hybrid-phase seismic wavelets, wherein the method comprises the following steps of: calculating fourth-order cumulants of seismic data; smoothing the fourth-order cumulants of the seismic data by using three-dimensional hysteretic window functions and estimating three spectrums of the seismic wavelets; and extracting the hybrid-phase seismic wavelets by using the three spectrums of the seismic wavelets. With the embodiment of the invention, the estimation precisions of high-order spectrums and wavelets can be improved.

Description

technical field [0001] The invention relates to the field of petroleum geophysical exploration, in particular to a method and a device for extracting mixed-phase seismic wavelets by using three spectra of seismic records. Background technique [0002] In seismic forward modeling, conventional inversion and seismic deconvolution methods, it is necessary to use seismic wavelets directly or indirectly. In the seismic forward modeling problem, it is necessary to use the wave equation or convolution model, combined with the seismic wavelet forward modeling to form a seismic numerical simulation record; in the inversion and deconvolution problems, it is also necessary to estimate the wavelet through seismic data, and the seismic wavelet The extraction accuracy has a great influence on the final inversion result. [0003] Seismic wavelet estimation methods can be divided into two categories, one is deterministic method and the other is statistical method. At present, the determin...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 王尚旭
Owner BC P INC CHINA NAT PETROLEUM CORP
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