基于傅氏变换有限差分的三维波动方程正演模拟并行算法  

A PARALLEL ALGORITHM OF 3D WAVE EQUATION FORWARD MODELING BY FFD

作　　者：熊高君[1,2] 彭更新[2] 贺振华[1] 高宏亮[2] 肖又军[2] 黄德济[1] 

机构地区：[1]地球探测与信息技术教育部重点实验室成都理工大学,成都610059 [2]中国石油塔里木油田公司研究院,库尔勒841000

出　　处：《物探化探计算技术》2012年第4期411-414,366-367,共4页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家973课题(2007CB209608);地球探测与信息技术教育部重点实验室开放基金(041009080053)

摘　　要：傅氏变换有限差分(即FFD)混合波场延拓法波动方程正演模拟精度高,但三维FFD因其计算复杂、数据存储巨大而难以推广。这里提出三维FFD一步法正演模拟并行算法,把一个串行的大规模频率循环分割成并行的多个小规模频率循环,并发执行多个波场延拓来提高运算速度,并通过由给定的资源设定并行数,以及适时重排三维数据,大大增强了算法的适应性和时效性。通过对比并行和非并行正演实验,验证了算法的有效性。The formula of Fourier Finite Difference(FFD) hybrid wave field extrapolation is precise.It is difficult for 3D FFD algorithm to be used popularly because of complexity of computation and huge amount of data storage.A parallel formula of 3D FFD one step wave equation forward modeling is presented,which is based on dividing a serial large-scale circulation of frequency into multi parallel small-scale ones.Computing efficiency is improvement by multi threads of wave field extrapolation being made simultaneously.On the other hand,parallel number is set flexibly according to assigned resources,and sequence of 3D data is also reordered timely as well,so that the advantage of applicability and real-time property of presented formula is largely enhanced.Efficiency of the method is validated through the comparison of parallel and nonparallel experiment.

关 键 词：FFD混合延拓 三维数据重排 三维正演模拟 频率循环 并行算法 

分 类 号：P631.4[天文地球—地质矿产勘探]