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High-precision wave impedance inversion method and system based on full-waveform inversion

A technology of full waveform inversion and wave impedance inversion, which is applied in seismic signal processing and other directions, and can solve problems such as inapplicability of fine interpretation of complex structures

Active Publication Date: 2020-03-03
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

None of these published schemes are suitable for the fine-grained interpretation of complex constructs

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  • High-precision wave impedance inversion method and system based on full-waveform inversion
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  • High-precision wave impedance inversion method and system based on full-waveform inversion

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Embodiment Construction

[0061] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0062] (1) Method principle

[0063] ①Earthquake forward modeling based on the velocity-impedance wave equation

[0064] Seismic forward modeling is the basis of seismic inversion. The commonly used acoustic wave equation seismic forward modeling is usually expressed by the velocity-density acoustic wave equation in the time domain:

[0065]

[0066] where v(x) is velocity, ρ(x) is density, P(x, t) is pressure field, f(x, t) is source in time domain, x s is the coordinates of the source position, δ(x-x s ) represents the impulse function. In order to use the wave equation to perform wave impedance inversion, the present invention establishes a first-order velocity-impedance wave equation based on the acoustic wave equation according to the relationship between wave impedance and velocity density:

[0067]

[0068] where p is the pressure field, I p is the ...

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Abstract

The invention provides a high-precision wave impedance inversion method and system based on full-waveform inversion and belongs to the field of seismic data interpretation. According to the high-precision wave impedance inversion method based on full-waveform inversion, a speed-impedance equation based on CPML boundary conditions is adopted for seismic wave numerical value forward modeling, so that a seismic numerical value simulation record can be obtained; and high-precision wave impedance is obtained through the full-waveform inversion according to the difference between the seismic numerical value simulation record and actual observation data. According to the method, the impedance obtained through the full-waveform inversion can not only be accurate at a well position, but also a structural form in a real model can be obtained through inversion; and the boundaries of faults and blocks are clear. When an impedance model obtained by the full waveform inversion is used for seismic data interpretation, so that the accuracy and reliability of oil and gas prediction can be greatly improved.

Description

technical field [0001] The invention belongs to the field of seismic data interpretation, and in particular relates to a high-precision wave impedance inversion method and system based on full waveform inversion. Background technique [0002] Using seismic data to perform wave impedance inversion is a commonly used seismic special processing and interpretation technology in seismic oil and gas exploration. Wave impedance has a clear physical meaning, and is a deterministic method for reservoir prediction and reservoir characterization, and has achieved remarkable results in the application of actual data. The existing seismic wave impedance inversion methods also have certain disadvantages. The propagation of seismic waves is three-dimensional in space. The existing seismic wave impedance inversion method is based on the ray theory and uses the convolution model to carry out in one-dimensional depth space, without considering the comprehensive effect of seismic wave propaga...

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 何兵红方伍宝胡光辉
Owner CHINA PETROLEUM & CHEM CORP
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