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当今地球动力学的研究已逐步引起重视 ,尤其是高新探测技术的发展 ,将会大大加快其研究步伐。地球物理勘探作为重要的探测技术之一 ,已在该领域做出了重要贡献 ,比如能源探测、环境保护、防灾减灾工作中都需要物探技术。文中就地震勘探领域中地震波成像前沿技术———深度偏移的核心问题———速度模型的建立展开深入的研究。在分析现有方法缺陷的基础上 ,提出投影解析速度建模方法。该方法建立在两个重要事实依据之上 :(1)地震波旅行时误差是由描述地下反射界面的深度误差和描述地层的速度误差共同引起的 ;(2 )在反演中要保证零炮检距旅行时不变。在局部平面波前假设和拉东投影原理下 ,导出由旅行时误差计算界面深度误差和速度误差的解析公式。该方法可保证界面深度和层速度同步快速收敛。与现有方法相比 ,该解析法可以明显提高计算效率 ,且应用效果相当明显。
Nowadays, the research of geodynamics has drawn more and more attention. Especially the development of high-tech detection technology will greatly accelerate its research. As one of the most important exploration technologies, geophysical exploration has made important contributions in this field. For example, geophysical prospecting technology is needed in energy exploration, environmental protection and disaster prevention and mitigation. In this paper, the cutting-edge seismic imaging technology in the field of seismic imaging - the core issue of depth migration - the establishment of velocity model to conduct an in-depth study. Based on the analysis of the defects of the existing methods, a method for modeling the velocity of projection analysis is proposed. The method is based on two important factual bases: (1) the error of traveltime of seismic wave is caused by the depth error describing the underground reflection interface and the velocity error describing the formation; (2) Stay unchanged when traveling. Based on the principle of local plane wavefront and the principle of Radon projection, the analytical formula for calculating the depth and velocity errors of the interface when traveling is calculated. This method can guarantee the rapid convergence of interface depth and layer speed. Compared with the existing methods, the analytical method can obviously improve the computational efficiency, and the application effect is quite obvious.