Anisotropy attenuation surface wave analogy method based on Chebyshev pseudo-spectral method

An anisotropic and Chebyshev technology, applied in the field of anisotropic attenuation surface wave simulation based on the Chebyshev pseudospectral method, to achieve the effect of improving accuracy

Active Publication Date: 2016-07-27
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method to solve the problem of shallow anisotropic attenuation surface wave simulation existing in the prior art

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Embodiment Construction

[0013] The main idea of ​​the present invention is, based on obtaining the shallow geophysical parameter data, defining the observation system and the source function, and then obtaining the update equation of the surface wave field at the free interface according to the vertical and tangential stress continuity conditions of the free interface, and then In the vertical direction, the Chebyshev pseudospectral method is used to calculate the derivative, and in the horizontal direction, the Fourier pseudospectral method is used to calculate the derivative. Boundary, using a method similar to the free boundary, absorbs the seismic wave field reflected into the model, thereby obtaining the wave field update equation of the bottom interface, and calculates the surface wave field according to the wave field update equation of the bottom interface, and outputs the surface wave Cannon records and TRON snapshots. In this way, the problem of shallow anisotropic attenuating surface wave ...

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Abstract

The invention discloses an anisotropy attenuation surface wave analogy method based on a Chebyshev pseudo-spectral method.The analogy method includes the steps of obtaining shallow geophysical parameter data, a definition observing system and a seismic source function; obtaining a free interface surface wave field updating equation from a wave equation according to free interface vertical and tangential stress conditions; calculating vertical and horizontal derivatives of the free interface surface wave field updating equation by adopting the Chebyshev and Fourier pseudo-spectral method in the vertical and horizontal directions; calculating time differentiation of an anisotropy attenuation medium surface wave equation of the free interface surface wave field updating equation through four-order Runge-Kutta discretization; calculating wave field absorption of two boundaries in the horizontal direction of a model; decomposing the wave equation into an incident wave equation and an emergent wave equation, obtaining a wave field updating equation of the bottom boundaries, and calculating surface waves of the current moment based on the wave field updating equation of the bottom boundaries to generate surface wave shot records and wave field snapshots.The problem of shallow anisotropy attenuation surface wave simulation in the prior art is solved by the anisotropy attenuation surface wave analogy method.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to an anisotropic attenuation surface wave simulation method based on the Chebyshev pseudospectral method. Background technique [0002] High-precision 3D seismic technology has been successfully promoted and innovated in various oilfields. The old oilfields in eastern my country, such as Shengli Oilfield and Daqing Oilfield, are located in plain areas, while other major production areas, such as Tahe and Ordos Basins, are mostly deserts and loess. In complex surface areas such as plateaus, the exploration area has great resource potential, and the extremely thick and loose loess layer and shallow desert strata are not conducive to the generation of effective seismic waves, and the shallow surface has a strong absorption and attenuation effect on seismic waves, which seriously affects seismic data processing. [0003] However, shallow surface waves are developed, and the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 杨春颖王赟
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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