Surface Fitting Method of Multilevel Subdivision Mesh Based on Complex Boundary Constraints

A boundary constraint and surface fitting technology, which is applied in the field of multi-level subdivision grid surface fitting, can solve problems such as no application scheme and no support for boundary constraints, so as to achieve seamless fitting, solve interpolation accuracy and artificial The contradiction of computer interaction speed and the effect of good compatibility

Inactive Publication Date: 2016-03-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

But for now, these schemes have limitations for domestic petroleum geological exploration, such as: only for a specific application, such as generating contours, restoring geological caps, three-dimensional blocks, etc., but not universal for a variety of applications; or does not support some complex boundary constraints

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  • Surface Fitting Method of Multilevel Subdivision Mesh Based on Complex Boundary Constraints
  • Surface Fitting Method of Multilevel Subdivision Mesh Based on Complex Boundary Constraints
  • Surface Fitting Method of Multilevel Subdivision Mesh Based on Complex Boundary Constraints

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Embodiment Construction

[0038] First define some basic geological structures and scheme terms:

[0039] Point: Refers to the control point of the formation layer and fault plane shape or the point where it intersects with the model boundary, x and y are the plane coordinate control quantities, and z is the vertical space control quantity. Points are the basic data describing the shape of strata and fault planes. In practice, interpolation can be performed on the basic control points to form new control points, which is more conducive to describing strata and fault planes.

[0040] Triangle: refers to the triangle formed by connecting three adjacent points on the stratum or fault plane, and it is not allowed to cross the strata and fault planes. The basic principles to follow when using triangular surfaces to describe strata and fault planes are: on the one hand, make the triangles fit into regular triangles as much as possible and avoid narrow and long triangles, which is conducive to the numerical p...

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Abstract

The invention discloses a multi-level subdivision grid surface fitting method based on complex boundary constraints, which comprises the following steps: generating a two-dimensional rectangular grid; constraining the boundary to project on the horizon surface subdivision grid; Surface grid point interpolation; horizon surface triangulation fitting. The positive effects of the present invention are: the solution for space surface fitting suitable for various applications has good compatibility with various horizon data; it supports various complex boundary constraints and has good adaptability; it supports Various applications of horizon surface fitting have good versatility; using the idea of ​​multi-level grid nesting, it not only ensures the accuracy of horizon interpolation, but also solves the contradiction between interpolation accuracy and human-computer interaction speed; by solving The problem of triangulation between mesh and subdivision mesh is achieved, and the seamless fitting inside the surface is realized.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional geological modeling, in particular to a multi-level subdivision grid surface fitting method based on complex boundary constraints. Background technique [0002] In the petroleum industry, a serious problem is: how to find small-scale and deeply buried oil and gas fields, and transform existing oil fields and prolong the oil production life of existing oil fields. The main method of oil and gas exploration is to reconstruct the large-scale geological structure through the propagation of seismic waves generated by artificial earthquakes in the geological structure, and to understand the stratum structure in local areas through well logging data, and to find out the location of oil and gas reservoirs and their distribution, estimated reserves and their exploration value. Due to the high cost of drilling, blind drilling development is not allowed. To this end, it is necessary to carry out ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/30
Inventor 鲁才岳鹏飞胡光岷
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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