Large-scale 3 D Seismic Data Volume Rendering Method Research And Software Development

Visualization in Scientific Computing(VSC) is a hot spot in Computer Graphicscurrently. The basic idea of VSC is convert large-scale data gained from scientificexperiments and the engineering into intuitional graphs with computer figure technology.VSC can reveal phenomena and rules in scientific data by graphs, which help peopleunderstand the data clearly. As an important branch in VSC, the volume rendering hasadvantage in implicit details of the inner structure of objects. Seismic exploration is animportant way in the search of oil and gas. When applied into seismic exploration, thevolume rendering can enhance the efficiency of exploration greatly, which aremeaningful for the realm of oil and the progress of economy and society. As mostseismic data are large-scale, there are more and more research focus on enhance theefficiency of plotting and interaction in base of high quality of graphs. In this article, weimprove the2D texture volume rendering algorithm according to the characteristics ofseismic data, and finish3D texture volume rendering based on the algorithm. Thecontents of our work is as follows:First, we introduce some classic volume rendering algorithms, analyze theiradvantages and flaws, explain whether they’re fit for volume rendering of3D seismicdata. Finally we choose the2D texture volume rendering algorithm and study it indepth.Second, we propose using the brick format instead of traditional SEG-Y formatto store seismic data, so that we can avoid the imbalance of efficiency when readingseismic data in random slice.Third, we propose an algorithm based on volume smooth in order to eliminatetexture pseudo boundary. Through reflecting the horizon data missed in sampling intodifferent colors and opacity in current texture slice according to specific rules, thealgorithm and is able to obscure or even eliminate pseudo boundary.Finally, we finish the design and development of visualization system of3Dseismic data. The system fuses the2D texture volume rendering algorithm together andthe algorithm we proposed for eliminating texture pseudo boundary, and adopts it as the algorithm in the module for volume rendering. In the display progress, we takeadvantage of multi-thread backstage update technology to improve the interactivity ofsystem. In the brick data generation module, we raise the efficiency of data reading byconverting the SEG-Y data into brick data.