【摘要】：隨著地質(zhì)資源勘探，地質(zhì)災(zāi)害防治，海洋戰(zhàn)略等工作的大力開(kāi)展，國(guó)家對(duì)于地球物理的研究越來(lái)越深入。在國(guó)家大力開(kāi)展實(shí)施國(guó)家深部探測(cè)技術(shù)與實(shí)驗(yàn)研究專(zhuān)項(xiàng)的背景下，各個(gè)高校和科研單位協(xié)同合作，共同承擔(dān)起項(xiàng)目的開(kāi)發(fā)與實(shí)施。作為承擔(dān)地學(xué)數(shù)據(jù)可視化開(kāi)發(fā)，在大規(guī)模地學(xué)數(shù)據(jù)下進(jìn)行圖形繪制和可視化平臺(tái)建設(shè)的開(kāi)發(fā)人員，在充分了解了需求，結(jié)合國(guó)內(nèi)外同行業(yè)發(fā)展水平，各方進(jìn)行調(diào)研論證后，決定開(kāi)發(fā)一套專(zhuān)項(xiàng)專(zhuān)用的地學(xué)應(yīng)用的可視化平臺(tái)�？茖W(xué)計(jì)算可視化是通過(guò)計(jì)算機(jī)工具，，把實(shí)驗(yàn)獲取的大量數(shù)據(jù)轉(zhuǎn)換成為人的視覺(jué)可以直接感受到的計(jì)算機(jī)圖像，由于地學(xué)數(shù)據(jù)抽象復(fù)雜，對(duì)地學(xué)數(shù)據(jù)轉(zhuǎn)化成可視的圖形后，對(duì)于地學(xué)專(zhuān)家能很方便通過(guò)交互操作進(jìn)行分析研究。 本文針對(duì)項(xiàng)目中承擔(dān)的工作進(jìn)行了深入的研究和分析，對(duì)項(xiàng)目所要求的二維Mesh網(wǎng)格可視化進(jìn)行廣泛的探討，其中二維Mesh網(wǎng)格是一種簡(jiǎn)單的結(jié)構(gòu)網(wǎng)格，能非常直觀的顯示各種地學(xué)數(shù)據(jù)，其中等值線就是網(wǎng)格顯示數(shù)據(jù)中最常用的一種表達(dá)形式，本文制定出可行的方案，對(duì)網(wǎng)格中等值線的繪制給出了完善的解決方法。同時(shí)本文對(duì)三維Mesh網(wǎng)格的等值面可視化也進(jìn)行了初步的討論，由于三維Mesh網(wǎng)格的復(fù)雜性，本文對(duì)各種可能出現(xiàn)的情況進(jìn)行了歸納，提出了一套可行的可視化方案。 本文對(duì)項(xiàng)目中對(duì)斷層的需求展開(kāi)論述，并應(yīng)用到角點(diǎn)網(wǎng)格這一模型，角點(diǎn)網(wǎng)格是一種結(jié)構(gòu)化網(wǎng)格，這種網(wǎng)格中每個(gè)網(wǎng)格單元都有自己獨(dú)立的八個(gè)頂點(diǎn)，這種網(wǎng)格的好處就在于能很好的對(duì)地學(xué)斷層進(jìn)行描述。本文對(duì)角點(diǎn)網(wǎng)格展開(kāi)來(lái)進(jìn)行詳細(xì)的介紹和廣泛的討論，對(duì)角點(diǎn)網(wǎng)格中斷層的獲取進(jìn)行研究，對(duì)斷層面的可視化進(jìn)行說(shuō)明。對(duì)于大規(guī)模地學(xué)數(shù)據(jù)的載入，我們要兼顧速度和質(zhì)量，所以我們應(yīng)用到直角網(wǎng)格。直角網(wǎng)格是一種非常基礎(chǔ)的網(wǎng)格類(lèi)型，這種網(wǎng)格繪制速度非常快，但是效果一般，尤其是對(duì)斷層不能很好的表達(dá)。本文把直角網(wǎng)格和角點(diǎn)網(wǎng)格結(jié)合起來(lái)，建立混合網(wǎng)格模型，在斷層附近使用角點(diǎn)網(wǎng)格，在遠(yuǎn)離斷層的區(qū)域使用直角網(wǎng)格。這是一種混合化的非結(jié)構(gòu)模型，因?yàn)槎际橇骟w網(wǎng)格，在拓?fù)浣Y(jié)構(gòu)上差異不大，容易結(jié)合。在對(duì)斷層的表達(dá)上與全使用角點(diǎn)網(wǎng)格時(shí)沒(méi)有差別，但是在非斷層區(qū)域使用的簡(jiǎn)單結(jié)構(gòu)化網(wǎng)格會(huì)大大的減少計(jì)算和存儲(chǔ)，提高繪制的速度。最后，本文還對(duì)PEBI網(wǎng)格進(jìn)行了簡(jiǎn)單的研究，PEBI網(wǎng)格是用于油藏模擬的一種網(wǎng)格，對(duì)于PEBI網(wǎng)格的繪制，我們對(duì)三角網(wǎng)格和Voronoi圖的生成給出了方法，并最后進(jìn)行了裁剪。
[Abstract]:With the development of geological resources exploration, geological disaster prevention, marine strategy and so on, the research on geophysics is getting deeper and deeper. Under the background of the implementation of the national deep exploration technology and experimental research project, various universities and scientific research institutions cooperate to jointly undertake the development and implementation of the project. As a developer who undertakes the visualization development of geoscience data and builds a graphic drawing and visualization platform under large-scale geoscience data, after fully understanding the requirements and combining the development level of the same industry at home and abroad, all parties carry out investigation and demonstration. Decided to develop a special set of special geoscience application visualization platform. Visualization of scientific computation is to convert a large number of experimental data into computer images that can be directly felt by human vision through computer tools. Because of the complex abstraction of geoscience data, the geoscience data is transformed into visual graphics. It is convenient for geoscientists to analyze and study by interactive operation. In this paper, the work undertaken in the project has been deeply studied and analyzed, and the visualization of two-dimensional Mesh grid required by the project has been extensively discussed. Among them, two-dimensional Mesh grid is a simple structural grid. It can display all kinds of geoscientific data intuitively, and the isoline is one of the most commonly used expression forms in the grid display data. In this paper, a feasible scheme has been worked out, and a perfect solution to the drawing of the contour line in the grid has been given. At the same time, the visualization of isosurface of 3D Mesh mesh is also discussed in this paper. Due to the complexity of 3D Mesh mesh, various possible situations are summarized and a set of feasible visualization scheme is put forward. In this paper, the requirements for faults in the project are discussed and applied to the model of corner grid, which is a structured grid in which each grid cell has its own eight vertices. The advantage of this grid is that it can describe geoscientific faults well. This paper introduces and discusses the corner grid in detail, studies the acquisition of the interruption layer of the corner grid, and explains the visualization of the fault level. For large scale data loading, we have to consider both speed and quality, so we apply it to rectangular grids. Cartesian mesh is a very basic mesh type. The grid rendering speed is very fast, but the effect is general, especially the fault can not be well expressed. In this paper, a hybrid grid model is established by combining the right angle grid with the corner grid. The corner grid is used near the fault and the right angle grid is used in the area far away from the fault. This is a hybrid unstructured model, because it is a hexahedron mesh, which has little difference in topology and is easy to combine. There is no difference between the expression of fault and the full use of corner grid, but the simple structured grid used in non-fault area will greatly reduce the computation and storage, and improve the speed of rendering. In the end, the PEBI grid is a kind of grid used in reservoir simulation. For the drawing of PEBI mesh, we give a method to generate triangular grid and Voronoi diagram, and finally we cut it out.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：P208;TP391.41

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