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PP wave and PS wave joint AVO inversion method using average angle of incidence gather

A technology of average incident angle and incident angle, which is applied in the field of seismic exploration and can solve problems such as large errors in inversion methods

Active Publication Date: 2015-10-07
北京多分量地震技术研究院
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Problems solved by technology

[0005] The main purpose of the present invention is to provide a combined AVO inversion method of PP wave and PS wave using the average incident angle gather, so as to solve the problem of large errors in the inversion method existing in the prior art

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  • PP wave and PS wave joint AVO inversion method using average angle of incidence gather

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Embodiment Construction

[0027] The main idea of ​​the present invention is that based on the input data used is the average incident angle gather, and using a unified objective function, the residual error between the forward modeling gather of PP wave and PS wave and the actual data average incident angle gather Combined together, to calculate the accurate PP wave and PS wave reflection coefficient, carry out the simultaneous least squares inversion of P-wave velocity, S-wave velocity and density, and further in the inversion process, modify the initial model through multiple iterations, so that the target The function reaches the minimum, thereby making the parameters obtained by the present invention more accurate.

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] First of all, in an isotropic mediu...

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Abstract

The invention discloses a PP wave and PS wave joint AVO inversion method using an average angle of incidence gather. The method comprises the steps of calculating a compression coefficient of compressing a PS wave into a PP wave time domain; applying the compression coefficient to a PS wave AVA gather to obtain a PS wave AVA gather of the PP wave time domain; sorting the PP wave AVA gather and the compressed PS wave AVA gather into AVA gathers in first and second angle of incidence ranges; performing weighted stack for the PP wave and PS wave AVA gathers in the first and second angle of incidence ranges, forming an average angle of incidence gather, and extracting seismic wavelets of the PP and PS waves respectively in the same time window; and extrapolating the P wave speed, S wave speed and density which are obtained by well logging into an initial model so as to calculate reflection coefficients of the PP and PS waves, and combining the seismic wavelets into an average angle of incidence gather. The invention can be used for solving the problem of there being large errors in an inversion method in the prior art.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a combined AVO inversion method of PP waves and PS waves using average incident angle gathers. Background technique [0002] With the deepening of exploration and development of oil and gas fields in my country, there are fewer and fewer structural oil and gas reservoirs, and unconventional oil and gas resources such as tight oil, shale gas, and coalbed methane have become an important direction for exploration. In this process, the technical means of seismic exploration are also constantly developed to deal with the increasingly complex problems of oil and gas exploration. Among many new seismic exploration technologies, multi-component seismic technology shows obvious advantages in solving complex reservoir exploration problems. A large number of theoretical studies have shown that the combined AVO inversion of PP and PS waves obtained from multi-component seismic ...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 芦俊王赟
Owner 北京多分量地震技术研究院
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