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A 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, can solve problems such as inapplicability to fine interpretation of complex structures, achieve clear boundaries of fault blocks, and improve accuracy and reliability

Active Publication Date: 2021-12-31
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

Method used

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  • A high-precision wave impedance inversion method and system based on full waveform inversion
  • A high-precision wave impedance inversion method and system based on full waveform inversion
  • A 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, belonging to the field of seismic data interpretation. The high-precision wave impedance inversion method based on full waveform inversion uses the velocity-impedance equation based on CPML boundary conditions to carry out seismic wave numerical forward modeling to obtain seismic numerical simulation records, and uses the error between the seismic numerical simulation records and actual observation data to pass the full Waveform inversion obtains high-precision wave impedance. The impedance obtained through the inversion of the full waveform by the method of the present invention not only obtains an accurate impedance value at the well position, but also inverts to obtain the structural form in the real model, and the boundary of the fault block is clear. Using the impedance model obtained from full waveform inversion for seismic data interpretation will greatly improve the accuracy and reliability of oil and gas prediction.

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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Patent Type & Authority Patents(China)
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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