Suppress numerical dispersion in reversetime migration of acoustic wave equation using optimal nearly analytic discrete method

作     者：Liu Ming-Zhu He Bing-Shoug 刘明珠;何兵寿

作者机构：Key Lab of Submarine Geosciences and Prospecting TechniquesMinistry of EducationOcean University of ChinaQingdao 266100China Evaluation and Detection Technology Laboratory of Marine Mineral ResourcesQingdao National Laboratory for Marine Science and TechnologyQingdao 266071China 

基　　金：financially supported by the National Key R&D Program of China(No.2018YFC1405900) the National Natural Science Foundation of China(No.41674118) the Fundamental Research Funds for the Central Universities(No.201822011) the National Science and Technology Major Project(No.2016ZX05027-002) 

出 版 物：《Applied Geophysics》 (应用地球物理（英文版）)

年 卷 期：2020年第17卷第1期

页      码：133-142,170页

摘      要：Using staggered-grid finite difference method to solve seismic wave equation,large spatial grid and high dominant frequency of source cause numerical dispersion,staggeredgrid finite difference method,which can reduce the step spatial size and increase the order of difference,will multiply the calculation amount and reduce the efficiency of solving wave *** optimal nearly analytic discrete(ONAD)method can accurately solve the wave equation by using the combination of displacement and gradient of spatial nodes to approach the spatial partial derivative under rough grid and high-frequency *** this study,the ONAD method is introduced into the field of reverse-time migration(RTM)for performing forward-and reverse-time extrapolation of a two-dimensional acoustic equation,and the RTM based on ONAD method is realized via normalized cross-correlation imaging condition,effectively suppressed the numerical dispersion and improved the imaging *** ONAD method to image the groove model and SEG/EAGE salt dome model by RTM,and comparing with the migration sections obtained by staggered-grid finite difference method with the same time order 2 nd and space order 4 th,results show that the RTM based on ONAD method can effectively suppress numerical dispersion caused by the high frequency components in source and shot records,and archive accurate imaging of complex geological structures especially the fine structure,and the migration sections of the measured data show that ONAD method has practical application value.

主 题 词：Acoustic wave equation RTM ONAD method numerical dispersion suppression 

学科分类：081801[081801] 081802[081802] 0707[理学-海洋科学类] 08[工学] 0708[理学-地球物理学类] 0818[工学-交通运输类] 0825[工学-环境科学与工程类] 0704[理学-天文学类] 

核心收录：

D　O　I：10.1007/s11770-019-0790-1

馆 藏 号：203960617...