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High-precision spatial and temporal arbitrary multiple variable grid finite difference forward modeling method

A finite-difference, high-precision technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of time variable step size and reduced simulation efficiency

Inactive Publication Date: 2016-01-27
中石化石油工程地球物理有限公司胜利分公司
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Problems solved by technology

However, if the traditional unified time step is used, there will be a time oversampling problem in the medium slowly changing region, which will greatly reduce the simulation efficiency
The problem of time-varying step size remains to be solved

Method used

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  • High-precision spatial and temporal arbitrary multiple variable grid finite difference forward modeling method
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  • High-precision spatial and temporal arbitrary multiple variable grid finite difference forward modeling method

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Embodiment Construction

[0039] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0040] figure 1 It is a flow chart of the high-precision space and time arbitrary multiple variable grid finite difference forward modeling method of the present invention. The specific implementation process is as follows:

[0041] In step 101, a forward velocity model of the subsurface medium is established, and large grids and small grids are divided according to the model area. And according to the grid size, set the forward modeling simulation time sampling step in different spatial grid areas.

[0042] Such as figure 2 As shown, the present invention realizes multi-level variable grid model subdivision. The area in the model that needs to be calculated using small grids is nested and subdivided with two layers of small grids inside and...

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Abstract

The invention provides a high-precision spatial and temporal arbitrary multiple variable grid finite difference forward modeling method, which comprises the steps of: step 1, establishing a forward modeling speed model of an underground medium; step 2, subjecting the forward modeling speed model to two-dimensional grid discretization, and subjecting an acoustic wave field in the forward modeling speed model to two-dimensional grid discretization, wherein the acoustic wave field is located on grid nodes; step 3, subjecting a perfectly matched layer boundary condition to grid discretization; and step 4, conducting time-domain finite difference forward modeling simulation through an acoustic wave equation, wherein time sampling step lengths are variable step lengths at grids of different sizes. The high-precision spatial and temporal arbitrary multiple variable grid finite difference forward modeling method can effectively suppress forward modeling frequency dispersion, significantly increases signal-to-noise ratio, and greatly improves precision and efficiency of forward modeling simulation.

Description

technical field [0001] The invention relates to seismic wave forward modeling simulation technology, in particular to a high-precision space and time variable grid finite difference forward modeling method with arbitrary multiples. Background technique [0002] Seismic wave forward modeling technology is an important research field in the field of geophysics at home and abroad, and the calculation method based on wave theory has the most application prospects, because it can maintain the kinematics and dynamics characteristics of seismic waves, and can accurately simulate the propagation characteristics of seismic waves. Purpose. Among them, the finite difference method is one of the most commonly used seismic wave forward modeling numerical simulation methods. It has the advantages of simple concept and calculation format, and is applicable to homogeneous media, heterogeneous media, and anisotropic media, so it has been widely valued in the seismological field. [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/28G06F19/00
Inventor 刘斌刘成斋王增明牟风明陈吴金邸志新谷玉田张在武魏耀文
Owner 中石化石油工程地球物理有限公司胜利分公司
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