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Geological-stratum-structure-based method for generating triangular lattice grids

A grid generation and layer structure technology, applied in image data processing, 3D modeling, instrumentation, etc., to ensure connectivity

Inactive Publication Date: 2011-09-21
BEIHANG UNIV
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Problems solved by technology

However, this method only solves the problem of triangulation with arbitrary constraints on a single layer, and the numerical simulation of oil and gas migration requires that the grid structure not only achieve geometric consistency but also topological consistency at the interface between layers, so it is necessary to study a set of A connected grid grid generation method that can achieve geometric and topological consistency enables continuous simulation calculation of oil and gas migration attribute values ​​on strata and faults

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  • Geological-stratum-structure-based method for generating triangular lattice grids

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[0038]Any flow of oil and gas in the formation can be collectively referred to as oil and gas migration. Oil and gas migration is a dynamic process that occurs in geological history, and it is impossible to observe it directly. However, due to the limitation of experimental conditions, large-scale, long-term, and multiple Experiments influenced by these factors are often not possible. Therefore, the migration process can only be confirmed by various indirect means, and an accurate description of the oil and gas migration process can assist oil and gas exploration personnel to obtain relevant geographic information, thereby bringing some help to the exploration process. The main pathways for oil and gas migration are the permeable formations, unconformity surfaces, faults and fractures in the transport layer. They intersect and cut each other to form a complex three-dimensional network fluid transport system. Therefore, it is necessary to construct a three-dimensional geological...

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Abstract

The invention discloses a geological-stratum-structure-based method for generating triangular lattice grids, which is used for a system providing input grids for oil-gas migration and accumulation analog computation. The geological-stratum-structure-based method is characterized by comprising the following steps of: constructing a three-dimensional geological stratum structure model and calculating intersecting lines among stratums based on the geological stratum structure; constructing a triangular grid generation unit for each stratum; cooperatively processing a plurality of units sharing the intersecting lines among the stratums to realize a plurality of lattice grids which continuously transition among stratums; storing the triangular lattice grids by using non-manifold half-side data; and optimizing the local connectivity of a grid vertex point unit by adopting a consistent triangular subdividing method. By using the geological-stratum-structure-based method, the automatic generation of the triangular lattice grids under various geological stratum conditions can be realized and the connectivity of computational grids at stratum junction parts is ensured, so that an attribute value of the oil-gas migration can be used for continuous analog computation on various stratums and furthermore, an effective supplementary means is provided for geological experts to predict the favorable accumulation area of oil gas.

Description

technical field [0001] The invention relates to a method and system for generating a triangular lattice grid according to a three-dimensional geological layer structure, in particular to a method for generating a triangular lattice grid that maintains geometric and topological consistency at the junction of layers. Background technique [0002] A severe problem facing the petroleum industry at present is how to find large-scale and deeply buried oil and gas fields. Any flow of oil and gas in the formation can be collectively referred to as oil and gas migration. Studying the history of oil and gas migration and accumulation is an important means to find hidden oil and gas reservoirs. The construction of a three-dimensional oil and gas migration model can help geologists correctly understand oil and gas migration It is of great significance to guide the next step of oil and gas exploration, especially the exploration of subtle oil and gas reservoirs in areas with high explora...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/05
Inventor 孟宪海李吉刚杨钦
Owner BEIHANG UNIV
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