【摘要】 叠前逆时偏移方法可以精确成像复杂地下构造,利用高阶有限差分方法求解声波方程,并给出了满足稳定性条件的采样间隔的选取方式.利用GPU/CPU加速技术实现地震资料的叠前逆时偏移算法,极大地提高了计算效率,算法也采用随机边界条件,节约了大量存储空间.分析了速度模型变化对成像结果的影响.复杂地震数据成像的测试结果表明,所述的叠前逆时偏移算法可清晰成像陡倾角成像清晰,对盐丘边界和内部构造成像效果也较好.更多还原

【Abstract】 Prestack reverse time migration(RTM) can image complicated subsurface construction accurately.The paper solves acoustic wave equation by high order finite difference, and the selected method for sampling interval which satisfies stability conditions is given.The paper accomplishes prestack RTM algorithm by GPU/CPU accelerating technology,which largely improves computation efficiency.Random boundary condition is adopted in algorithm, which saves much storage space.Also the paper discusses the influence of velocity model on imaging result.Tests on complicated seismic data set illustrate that,the RTM algorithm can image steep dip clearly,and can image the boundary and the inside construction of salt dome better.更多还原