Multi-level subdivided mesh surface fitting method based on complicated boundary constraint

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 versatility

Inactive Publication Date: 2013-01-09
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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  • Multi-level subdivided mesh surface fitting method based on complicated boundary constraint
  • Multi-level subdivided mesh surface fitting method based on complicated boundary constraint
  • Multi-level subdivided mesh surface fitting method based on complicated boundary constraint

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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 subdivided mesh surface fitting method based on a complicated boundary constraint. The method comprises the following steps of: generating a two-dimensional rectangular mesh; projecting a constrained boundary on a horizon surface subdivided mesh; performing interpolation on horizon surface mesh points; and performing triangular mesh fitting on the horizon surface. The method is suitable for the spatial curved surface fitting solution of various types of application, and has high compatibility with various types of horizon data; the method supports various complicated boundary constraint conditions, so that the method has high adaptability; the method supports various types of application of horizon surface fitting, so that the method has high universality; a multi-level mesh nested thought is utilized, the horizon interpolation precision is ensured, and the conflicts between the interpolation precision and a human-computer interaction speed are avoided; and the seamless fit in a curved surface is realized by avoiding triangularization between a mesh and a subdivided mesh.

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 ...

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Application Information

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Patent Type & Authority Applications(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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