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基于多尺度双变网格的时间域全波形反演

石油物探

2016年 55卷第No. 2期

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Title

Full waveform inversion based on multi-scale dual-variable grid in time domain

单位

(中国石油大学(华东)地球科学与技术学院,山东青岛266580)

Organization

(Department of Geophysics,School of Geosciences,China University of Petroleum,Qingdao 266580,China)

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。

Abstract

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.

关键词：

极性编码; 全波形反演; 时间域多尺度; 双变网格; Marmousi模型;

Keywords:

polarity encoding,; full waveform inversion,; multi-scale in time domain,; dual-variable grid,; Marmousi model;

基金项目

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)和中央高校基本科研业务费专项资金(R1401005A,15CX06005A)共同资助。

DOI

10.3969/j.issn.1000-1441.2016.02.010