Earthquake wave equation generation method and system

A wave equation and generation system technology, applied in the fields of seismic exploration and geological exploration, can solve the problems of difficult to deal with the change of medium speed, low precision, insufficient hardware conditions, etc., to improve the calculation accuracy and stability, good numerical stability, good stability

Inactive Publication Date: 2009-02-18
BC P INC CHINA NAT PETROLEUM CORP +2
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AI Technical Summary

Problems solved by technology

The main problems are: ① It is difficult to deal with strong velocity changes in the medium; ② It is difficult to find the global minimum travel time in the multi-valued travel time; ③ The amplitude information of the complex wave field is inaccurate; ④ The ray coverage density in the shadow area is insufficient
The finite element method can start from the scalar and vector motion equations, not limited to a specific coordinate system, and can flexibly divide the entire area. It is suitable for complex structural forms composed of uniform and non-uniform strata. However, when the calculation domain is large, use The finite element method solution, because of the large number of unknowns after the space coordinates are discrete, will inevitably lead to a large amount of computer time consumption and high calculation costs
At present, the hardware conditions for 3D seismic forward modeling are not enough
[0010] At present, the 3D forward simulation has low calculation efficiency, low accuracy, and relatively simple model, which cannot meet the needs of production.

Method used

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  • Earthquake wave equation generation method and system
  • Earthquake wave equation generation method and system
  • Earthquake wave equation generation method and system

Examples

Experimental program
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Effect test

example 1

[0208] Example 1: dt=0.00025s, vΔt Δx = 1.228 .

[0209] in, image 3 The result of the finite difference method of the left figure is unstable and the solution diverges;

[0210] image 3 the right Figure II The result of the order ADPI method is stable and the solution is correct.

example 2

[0211] Example 2: dt=0.00075s, vΔt Δx = 1.165 .

[0212] in, Figure 4 The result of the finite difference method in the left figure is unstable and the solution diverges

[0213] Figure 4 the right Figure II The results of the first-order ADPI method are stable and the solution is correct

[0214] Boundary condition analysis:

[0215] Absorbing boundary conditions are very important when modeling seismic records using the wave equation. In a limited area, when numerical methods are used to calculate, if the boundary is not processed, boundary reflection will occur. There are many methods for eliminating boundary reflections. Cerjan et al. attenuate outwardly propagating waves by introducing a lossy medium near the computational boundary. Since there will be reflection at the interface of two lossy media with different absorption coefficients, more absorbing layers are required to have a bette...

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Abstract

The invention provides a seismic-wave motion equation generating method and a system thereof. The seismic-wave motion equation generating method comprises: obtaining acoustic wave equation data; obtaining geological parameter information; executing arbitrary difference precise integration according to the acoustic wave equation data and the geological parameter information so as to get the seismic spread equation; obtaining the stability condition, the initial input condition and the boundary processing condition; and generating the seismic-wave motion equation by the seismic spread equation, the stability condition, the initial input condition and the boundary processing condition. The method has higher precision and better value stability, can greatly improve the precision and the stability of the calculation with hardly additional computational complexity. The completely matching layer boundary condition which is obtained according to the arbitrary difference precise integration plays a fine attenuating role in the boundary reflection. The method can provide the seismic-wave spread rule study in complex region with a high-precision data system with fine stability.

Description

technical field [0001] The present invention relates to the technical field of geological exploration, in particular to the technical field of seismic exploration, in particular to a method and system for generating seismic wave equations. Background technique [0002] In oil and gas exploration, it is particularly important to know the geological structure better and more accurately. After knowing the geological structure, the location of gas fields and oil fields, and the seismic wave propagation process of earthquake propagation can be judged. [0003] At present, the study of seismic wave propagation is carried out by finding out the seismic wave equation, that is, by means of seismic wave field numerical simulation technology. [0004] The above-mentioned seismic wave field numerical simulation technology is a technology that uses theoretical calculation methods to study the propagation law of seismic waves in the underground medium and obtain artificially synthesized s...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 王润秋胡天跃
Owner BC P INC CHINA NAT PETROLEUM CORP
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