基于检查点方法的各向异性介质逆时偏移

摘要

基于准P(quasi-P,qP)波方程研究了TTI介质逆时偏移方法,通过引入横波速度,改善数值模拟的稳定性.提出了联合有效内边界存储和检查点(checkpiont)方法降低存储需求的TTI介质逆时偏移成像方法,实现了震源波场的精确重建,为高精度逆时偏移成像奠定了基础,也使方法更好地适应大数据计算.借助图形处理器(Graphic Processing Unit,GPU)的高效并行计算能力,大幅度提升震源波场重建以及TTI介质逆时偏移成像的计算效率.应用BP2007各向异性理论模型数据进行测试的结果表明,TTI介质逆时偏移成像方法成像精度高、适用性强、稳定性好.%A reverse time migration method for tilted transversely isotropic (TTI) media that combines the efficient internal boundary storage and checkpoint method to reduce storage is proposed.In this method,shear-wave velocity is introduced into the qP-wave equation to improve the stability of the numerical simulation.To reduce the required storage,a combined efficient internal boundary storage and checkpoint method is proposed,thus realizing accurate reconstruction of source wave fields and improving its applicability to large data computation.Parallel computing of graphic processing units is used to enhance the efficiency of the source wave field recalculation and reverse time migration for TTI media.A test using BP 2007 Anisotropic Velocity Benchmark data revealed the feasibility and effectiveness of the proposed method.