Partition local densification and unequal distance dual grid generation method in complex mountainous area

A technology of meshing and refining meshes, which is used in seismic signal processing, preparation of test samples, special data processing applications, etc., to achieve the effect of increasing the depth sampling rate
CN104123449BInactive Publication Date: 2017-02-15JILIN UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
JILIN UNIV
Publication Date
2017-02-15
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a subregion local variable-density non-equidistant dual mesh division method for a complex mountainous region. The method comprises the steps that an overall model framework of the complex mountainous region is established according to the earth surface elevation and the calculated region range, the whole model framework is divided through square coarse meshes in sequence, a complex earth surface nearby region is divided through variable-density densified non-equidistant meshes, a seismic origin nearby region is divided through variable-density densified meshes, and other regions are divided through dual uniformly-multiplied densified meshes. By means of the meshes, the complex earth surface morphology and the distribution conditions of complex media nearby the earth surface can be depicted accurately and subtly, the boundary conditions nearby the complex earth surface can be achieved accurately and stably, the problem of a large error nearby a source point can be solved on the premise of not substantially increasing the calculated amount, the calculating efficiency can be improved substantially on the premise of guaranteeing the calculating accuracy, and spending of too much mesh generation cost, an extra storage space and extra calculated amount are not needed.
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Description

technical field

[0001] The invention relates to a grid subdivision method for complex medium models in technologies such as seismic wave numerical simulation and data processing in the field of geophysics, especially a fine grid subdivision method for complex mountain models. Background technique

[0002] Complex mountainous geological conditions often bring many thorny problems to technologies such as seismic wave numerical simulation and data processing in complex mountainous areas. The meshing technology for complex mountain models is a basic and key technology that affects the accuracy, efficiency, and stability of seismic wave numerical simulation and data processing technologies under complex mountain conditions.

[0003] At present, for the grid division of complex mountain models, uniform and single stepped grids, unequal grids, and curved grids are usually used. In the important technical links such as the accurate description of the complex surface shape of the co...

Claims

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