用可视化技术分析虚拟现实环境下三维地震数据场的研究

目的 用可视化方法分析三维地震数据，直接观察数据中隐藏的地质现象。方法：将第每个反射子波用一个粒子模型表示，来自同一反射面的子波粒子相互叠合成一个同相面。为加快显示速度，将一个三维地震数据体转换为三维二值图像，用有序扩展算法追踪同相面所在的三维连通域，细化后得到反射面的坐标数据。再在虚拟现实系统下的对反射面进行立体显示，直观地分析地下地层的结构。结果 实际数据试验得到了反射面的三维形态及断层的分布规律，立体显示更深刻地揭示了复杂地质现象及其规律。结论 只有在虚拟现实系统中进行三维地震数据的可视化，才能直观地看到地下地层的真实场景，真正实现三维数据的全三维解释，所提出的方法是有效。

Visualization of 3-D Seismic Data in Virtual Reality

Purpose :To analyses the 3-D seismic data with visualization, and see the geologic phenomenon and regularity directly hidden in the data. Methods: Using a particle model to show a reflection wavelet, all the particles from the same bed will coincide to a reflection surface. In order to improve display velocity, transform the seismic data to a 3-D two-valued image, trace the 3-D connected zone with ordered cross algorithm, thin the zone to get the coordinate of the reflection surface. Observe directly the stratigraphic structure by drawing the stereoscopic image of reflection surfaces in virtual reality system. Results: The 3-D shape of reflection surfaces and the extension of the faults is observed by fact experiment. The stereoscopic image can reveal more profoundly the complex geologic phenomenon. Conclusion: The method is efficient. Only visualization in virtual reality can directly observe the underground scene, and may realize 3-D interpretation of 3-D seismic data really.