【作者】 刘林；

【导师】 王泽兵； 孙霖；

【作者基本信息】 浙江大学 ， 计算机应用技术， 2013， 硕士

【摘要】 随着我国国民经济的深入发展,经济增长的速度和潜力对油气等能源的依赖越来越强烈。然而传统的油气资源探测方法已经远远不能满足经济发展的需求,世界各国均纷纷投入裂缝性油气资源的研究。通过对地质结构进行三维建模,利用有限元分析方法对地质结构进行分析和裂缝预测已经成了计算机在油气勘探应用领域的研究热点。本文针对通过有限元分析方法建立地质结构裂缝预测模型的需求,进行了三维地质结构建模研究,具体工作如下：1.在分析主流地质建模方法和各种地质模型优缺点的基础上,结合有限元分析具体需求采用四面体模型建模三维地质体。2.研究曲面重构与曲面运算方法。提出了一种基于曲率的三维地表重构方法和基于边界过滤的三维地层曲面切割方法。基于曲率的三维地表重构方法利用曲率控制插值密度生成地质曲面自适应网格；基于边界过滤的三维地层曲面切割方法结合曲面延伸,曲面求交,边界过滤技术实现曲面的任意分割以支持附带断层的三维地质体表面模型生成。3.基于地块模型和分组模型,提出了附带断层的三维地质结构表面模型自动生成方法。该方法对输入的地层、断层数据自动分组,利用曲面重构方法重构地层表面,利用曲面切割方法建立地质结构表面模型。4.利用有限元剖分方法对地质结构表面模型进行剖分生成裂缝预测所需的地质结构四面体模型,并采用有限元方法对模型进行计算。更多还原

【Abstract】 With the in-depth development of our national economy, the speed and potential of the economic growth has become increasingly dependent on gas and oil and other energy strongly. Traditional resource exploration method, however, has been far from being able to meet the needs and many countries have been investing research on the exploit of fractured oil and gas resources, which has a big potential. Modeling the geological structure in three-dimension and analyzing by finite element method has become a research hotspot for computer science applying in gas and oil resource exploit field.This paper, considering the requirements of finite element method, makes a deep research on the modeling and visualization of the geological structure in three-dimension and makes several contributions as follows:1. Study the major geological model to analyze their advantages and disadvantages and decide to choose facet and tetrahedral model to support the modeling and visualization in this paper.2. Study the common surface reconstruction and operation method. Propose a curvature-based surface reconstruction method which uses a curvature-density convert model to decide the interpolation density to generate self-adaptive mesh; propose a boundary filtering based surface split method which can split surface along any given boundary and is used to recovery the geological surface.3. Basing on block model and group model, the auto-modeling method for3D geological structure with faults is proposed. This auto-modeling method reconstructs the strata and fault surfaces, makes group models from input and generates3D geological structure surface model.4. Triangulate the surface model into tetrahedrons, which is the base of fracture prediction model, by constrained Delaunay method and analyze the model by the finite element method. Design and implement the modeling prototype system and finite element computing prototype system to perform modeling, analysis and visualization.更多还原