【摘要】 地震波的传播速度 ,可表示为地层中各点坐标的函数 ,即v=f(x ,y,z)。影响速度的因素很多 ,如岩性、地层时代、构造发展史等 ,因此速度的横向变化是不可忽视的。用统一的速度解决地质问题已不适应勘探的要求。变速处理地震剖面已经实现 ,但在解释上变速成图是个难题 ,其主要困难是如何进行变速空间归位。二维变速偏移成图系统从客观的地下构造几何形态着手 ,根据真实的视深度 ,进行变速偏移空间归位 ,从而实现变速成图。更多还原

【Abstract】 The velocity of seismic wave is a function of points in a stratum, that is v=f (x,y,z).Velocity field is influenced by many factors such as lithology, geologic age, and history of tectonic evolution. Because the lateral variations of velocity cannot be ignored, a unitary velocity will certainly fail to resolve the geological problem. Seismic data processing with variable velocity has been realized. But to produce a correct structure map using variable velocity is still a difficult problem. The key to the problem is how to migrate structures to their correct spatial positions. Mapping system of 2D variable velocity migration achieves velocity-variant mapping by migrating structures according to the subsurface structure and the true apparent depths of structures.更多还原