Three-dimensional geological modeling meshless method

Abstract

The invention discloses a three-dimensional geological modeling meshless method comprising the method of establishing the formation interface by using discrete point interpolation, the method of checking and optimizing the formation interface by using the data acquired in the geological section, the method of optimizing the special geological condition by using stratigraphic line extension, the method of cutting the model boundary by using BSP (Binary Space Partitioning) vector cutting technology and the method of assigning the correlated attribute values by using space discrete point interpolation. Construction of the three-dimensional geological model can be rapidly realized, and the modeling accuracy can be considered and the certain complex features in the geological bodies can also be expressed, such as pinch out, lenticle and rock and earth mass density change. Compared with the conventional modeling method based on the mesh, the discrete points are directly used as the basic units so that the complexity of mesh division and modeling reconstruction can be omitted and the modeling efficiency can be enhanced.

Description

technical field [0001] The invention relates to a gridless method for three-dimensional geological modeling. Background technique [0002] 3D geological modeling technology is an important part of geological and engineering informatization, which is helpful for geological evolution analysis, resource development and utilization, and engineering safety research. Its purpose is to establish a digital model that can reflect the geological form, structural relationship and internal attribute changes of geological bodies, including structural models (structural models) and attribute models. The structural model describes the morphological characteristics of the geological body, and the attribute model realizes the expression of the heterogeneity of the geological body. [0003] At present, 3D geological modeling is mainly based on three data models: (1) surface model, such as triangulated irregular network (TIN) model; (2) volume model, which contains regular voxels (such as str...

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Problems solved by technology

[0004] Modeling based on borehole data can complete the simulation of relatively regular continuous layered geological bodies, but the actual geological bodies generally contain special geological conditions such as pinch-outs or lenses, and modeling with this method will result in low model accuracy

Although the data obtained in the reconnaissance section is accurate, large-scale 3D geological modeling requires complex manual interaction, making modeling difficult

When constructing a 3D model using a grid as the basic unit, there are the following disadvantages: (1) Once a construction error is found or the geological changes are caused by internal and external dynamics, etc., it involves large deformation of the grid and grid reconstruction, which is time-consuming and laborious; (2) The choice of grid precision will greatly affect the modeling accuracy; (3) When expressing the heterogeneity of geological bodies, the amount of data is large, and the calculation is difficult and slow

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