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A Method of Seismic Wave Numerical Simulation

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

Active Publication Date: 2021-02-19
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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  • A Method of Seismic Wave Numerical Simulation

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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 present invention relates to the technical field of numerical simulation of seismic wave fields. The method for numerical simulation of seismic waves in complex surface and complex structures proposed by the present invention aims at the reason why false waves such as seismic source noise are prone to occur in the original algorithm. Strict numerical flow method is used to exchange wave fields between adjacent units, such as local Lax-Friedrich numerical flow. At the same time, the introduction of penalty factors reduces the impact of the time step reduction caused by the forced use of local Lax-Friedrich numerical flow. Based on the leap-frog time DGFEM earthquake numerical simulation algorithm has the advantages of large step size and low calculation cost, it can also achieve high-precision numerical simulation without false waves.

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 Patents(China)
IPC IPC(8): G06F30/23G06F111/10G06F119/14
CPCG06F30/23
Inventor 薛昭佘德平杨丽
Owner CHINA PETROLEUM & CHEM CORP
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