Viscoelastic medium seismic inversion method based on Zoeppritz equation

A seismic inversion and medium technology, which is applied in the fields of seismology, seismology, and seismic signal processing for logging records. Errors and other problems, to achieve the effect of good industrial production application value, strong inversion parameters, and avoid cumulative errors

Active Publication Date: 2021-06-29
CENT SOUTH UNIV
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  • Application Information

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Problems solved by technology

[0004] The inventors found that the linear inversion method based on the approximate Zoeppritz equation can stably solve ill-conditioned inversion problems or local extremum problems. large error, failed to make full use of the rich pre-stack information, and could not meet the fine characterization requirements of actual reservoirs in terms of inversion accuracy, especially for actual 3D large offset seismic data
For isotropic viscoelastic media, the traditional approximate reflection coefficient based on the Zoeppritz equation is an e

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  • Viscoelastic medium seismic inversion method based on Zoeppritz equation
  • Viscoelastic medium seismic inversion method based on Zoeppritz equation
  • Viscoelastic medium seismic inversion method based on Zoeppritz equation

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Embodiment 1

[0045] Such as Figure 1-Figure 6 As shown, Embodiment 1 of the present disclosure provides an accurate Zeoppritz equation seismic amplitude inversion method based on viscoelastic media, for the prediction of reservoir attenuation characteristics of isotropic viscoelastic media, the traditional approximate reflection coefficient based on Zoeppritz equation is unknown Too many parameters cause the inversion to be ill-conditioned, and the attenuation parameters cannot be estimated directly. An accurate Zeoppritz equation seismic amplitude inversion method based on viscoelastic media is proposed.

[0046] Firstly, the complex-valued seismic wave velocity with inverse Q factor is introduced into the Zoeppritz equation of viscoelastic medium to characterize the isotropic viscoelastic medium; then, using the disturbance theory and Taylor expansion method, the problem of solving the objective function is transformed into finding the reflection coefficient Gradient or partial derivati...

Embodiment 2

[0093] Embodiment 2 of the present disclosure provides a Zoeppritz equation-based seismic inversion system for viscoelastic media, including:

[0094] The data acquisition module is configured to: acquire seismic data and logging data;

[0095] The seismic wavelet acquisition module is configured to: obtain angle-dependent seismic wavelets according to the acquired seismic data;

[0096] The prior data acquisition module is configured to: obtain the prior data of the geological horizon model according to the acquired logging data;

[0097] The initial parameter acquisition module is configured to: obtain the initial value of the parameters of the geological horizon model according to the acquired prior data;

[0098] The inversion module is configured to: obtain the parameters of the geological horizon model according to the obtained initial value of the geological horizon model parameters, the angle-dependent seismic wavelet and the preset Zeoppritz reflection coefficient eq...

Embodiment 3

[0101] Embodiment 3 of the present disclosure provides a computer-readable storage medium on which a program is stored, and when the program is executed by a processor, the accurate Zeoppritz equation seismic amplitude inversion based on the viscoelastic medium as described in the first aspect of the present disclosure is realized. steps in the method.

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Abstract

The invention provides a viscoelastic medium seismic inversion method based on a Zoeppritz equation. The method comprises the following steps: acquiring seismic data and logging data; obtaining angle-dependent seismic wavelets according to the obtained seismic data; obtaining prior data of a geologic horizon model according to the obtained logging data; obtaining geologic horizon model parameter initial values according to the obtained prior data; obtaining geologic horizon model parameters according to the obtained geologic horizon model parameter initial values, the angle-dependent seismic wavelets and a preset viscoelastic medium Zeoppritz reflection coefficient equation, and obtaining an inversion result according to the obtained model parameters; according to the method, inversion is carried out based on the accurate Zeoppritz equation of a seismic pre-stack viscoelastic medium AVO, the inversion calculation precision is high, the inversion parameter purposiveness is high, and accumulative errors caused by step-by-step inversion or indirect calculation are avoided.

Description

technical field [0001] The present disclosure relates to the technical field of seismic inversion, in particular to a method for seismic inversion of viscoelastic media based on the Zoeppritz equation. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Seismic inversion is an effective method to obtain internal images of subsurface media and describe reservoirs in detail, and it is also the final form of high-resolution seismic exploration. Seismic data inversion greatly improves the value of reservoir characterization. As the focus of seismic research shifts from exploration to development, and from conventional oil and gas to unconventional oil and gas, especially shale gas, the fine distribution characteristics of underground oil and gas reservoirs are revealed through seismic inversion and other means, and the oil and gas reservoirs Th...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/48G01V1/50G01V1/30G06F17/11
CPCG01V1/282G01V1/48G01V1/50G01V1/30G06F17/11
Inventor 潘新朋葛子建张鹏飞李磊柳建新
Owner CENT SOUTH UNIV
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