摘 要 相干体技术是近年来地震勘探在资料解释方面的重要突破，与原来揭示地下异常体的方法相比，相干体可以更清楚地识别断层。该方法是一种自动和半自动的解释技术，它利用三维地震数据体中相邻道之间地震信号的相似性来描述地层、岩性的横向非均质性。 在地质开采、石油勘探等领域，可视化技术有着十分重要的意义。应用三维地震数据体可视化技术，可以对原始地震数据做出正确解释，从而得到矿藏是否存在、位置和储量等重要信息。借助于三维可视化技术，可以更准确地描述断层构造信息。三维可视化技术有面可视化和体可视两种。 面可视化技术是使用Delaunay三角网格化来近似物体表面，由于三维相干数据体中断层构造的特殊性，会造成断层显示时局部区域的异常现象，针对此情况本文提出局部区域优化方法来改善成图质量。 体绘制的传统算法是光线投射法，由于地震数据量大而绘制速度太慢，本文在借鉴一些改进算法的基础上，结合地震数据的特点，提出了一种基于图像空间的逆视变换的加速光线投射算法，实验结果表明该算法在保证相同图像效果的同时，具有明显的速度优势。

ABSTRACT Seismic coherency is an important breakthrough in seismic data interpretation in recent years. It have proven to be an effective method for imaging geological discontinuities such as faults and stratigraphic features. Using the similarity of seismic signals between a adjacent traces in 3-D seismic volume to describe the lateral stratal and litho logic inhomogeneity, it can automatic interpret seismic data. Scientific Visualization is an important technology in the fields of exploitation of geology and petroleum, reconstruction of 3-D topography. Application the Scientific Visualization technology of 3-D seismic data, researchers can interpret original seismic data exactly, so can get the important information of position and reserves of mineral resources. 3-D Scientific Visualization technology has two methods. One is surface rendering. Another is volume rendering. Surface rendering technology uses Delaunay triangulation to display object surface nearly. Because of the particularity of faults in 3-D coherence cube, surface rendering can cause abnormity in some area to display faults. A new method is introduced to optimizing the quality of surface rendering in this paper. The traditional algorithm of Volume Rendering is Ray-Casting, not a proper algorithm for the large 3-D seismic data, referring some improved method and considering the characteristic of seismic data, a new fast Ray-Casting algorithm of oriented image space and negative-view transform was brought forward. As a result, this algorithm excels the traditional obviously by speed with image quality in experiment.