Seismic wave numerical simulation method

A numerical simulation and seismic wave technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., to achieve the effect of suppressing false waves, large step size, and low calculation cost

Active Publication Date: 2018-05-25
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] The present invention proposes a seismic wave numerical simulation method for the numerical simulation of seismic wave field by discontinuous Galerkin finite element method based on leapfrog time format, in which obvious false waves such as source noise are usually observed in the numerical simulation results. This method can effectively suppress the false wave phenomenon

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[0033]The specific implementation manners of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0034] In this embodiment, the model calculation area is a triangular area. Define the grid density function according to the velocity distribution of the model and the spatial sampling requirements of the seismic wave finite element method Among them, v s is the shear wave velocity, f max is the maximum frequency of the wavelet used in the simulation, and N represents the number of sampling points required within a shortest shear wave wavelength. When the second-order space is used, N takes 1.9, and when the third-order space is used, N takes 0.9.

[0035] Apply the basic principle of the discontinuous Galerkin finite element method to deduce the integral equation (finite element equation) corresponding to the first-order velocity-stress equation of the elastic wave, and realize the decoupling of adjacent grid ce...

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Abstract

The invention relates to the technical field of seismic wave field numerical simulation, and discloses a seismic wave numerical simulation method for complex surfaces and complex structures. For reasons of false wave problems of seismic source noises and the like easily occurring in an original algorithm, a stricter numerical flow mode such as local Lax-Friedrich numerical flow is forcedly adoptedfor performing wave field exchange between adjacent units in the original algorithm; by introducing a penalty factor, the influence of time step length reduction and the like caused by forced adoption of the local Lax-Friedrich numerical flow is reduced; and the advantages of large step length and low calculation cost of a leapfrog time DGFEM-based seismic numerical simulation algorithm can be kept and high-precision false-wave-free numerical simulation can be realized.

Description

technical field [0001] The invention relates to the technical field of numerical simulation of seismic wave fields, in particular to a method for numerical simulation of seismic waves in complex surface and complex structures. Background technique [0002] At present, in the southern and western regions of my country, the focus of oil and gas seismic exploration is shifting to complex areas such as hills and piedmont structural belts. The surface conditions in these areas are extremely complex, with severe topographical ups and downs, great changes in elevation, and large changes in lithology velocity lead to serious inhomogeneity in the near-surface structure. At the same time, the underground structure is complex, such as strong folds, developed faults, steep structures, and large stratum changes. . They lead to problems such as low signal-to-noise ratio and difficult static correction of seismic data in these areas. Fundamentally solving these exploration problems requi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 薛昭佘德平杨丽
Owner CHINA PETROLEUM & CHEM CORP
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