摘要
巨大的计算量成为影响全波形反演发展的重要因素之一。为了提高计算效率,时空双变技术被引入到时间域多尺度全波形反演中。在波场正向延拓与残差波场的反向延拓过程中,在不同区域采用不同的网格间隔,并采用局部变时间采样来配合变网格方法,随着反演精度的提高,由低频到高频逐步反演,全局网格尺度不断减小,同时局部加密网格尺度也成比例地减少。从起伏地表模型和Marmousi模型的反演结果可以看出,采用多尺度时空双变网格全波形反演方法减少了计算量,目标区域的反演精度也得到了提高。
The large amount of calculation of full waveform inversion（FWI）has seriously restricted its development.In order to improve the efficiency of FWI,time-space dual-variable technology is applied in multi-scale full waveform inversion in time domain.In the process of wavefield forward continuation and residual wavefield back continuation,different grid scale is used in different regions,and the local variable time sampling is applied to match the variable grid method.With the improvement of the inversion accuracy,the inversion frequency increases,and the global grid scale reduces.The corresponding partial refined grid scale also reduces.From the inversion results of an irregular layer model and the Marmousi model we can conclude that the computational efficiency is improved by using the multi-scale time-space dual-variable FWI proposed in this paper,and the inversion accuracy of target bodies is improved.
出处
《石油物探》
EI
CSCD
北大核心
2016年第2期241-250,共10页
Geophysical Prospecting For Petroleum
基金
国家重点基础研究发展计划(973)项目(2014CB239006
2011CB202402)
国家自然科学基金项目(41104069
41274124)
中央高校基本科研业务费专项资金(R1401005A
15CX06005A)共同资助~~
