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A high expansion implicit finite-element prestack reverse time migration method
Limin Liu;  Yun Wang;  Yong Wang;  Jing Chen;  Yanqiu Liu
2018
发表期刊Exploration Geophysics
卷号49期号:6页码:844-855
摘要

Building on the concepts of cohesion degree and local relaxation, we propose an integrated hierarchical equilibrium parallel finite-element reverse time migration (HEP-FE-RTM) algorithm, which is a fine-grained central processing unit (CPU) parallel computation method in two-level host-sub-processors mode. A single master process is responsible for data reading and controlling the progress of the calculation, while each subordinate process deals with a part of the depth domain space. This algorithm is able to achieve single source forward-modelling and inversion calculation using more than 2000 CPUs. On the premise of controlling iteration times for convergence, sub-module/processors only communicate with their adjacent counterparts and the host processor, so the level of data exchange is proportional to cohesion degree. This HEP-FE-RTM algorithm has the distinct advantage that parallel efficiency does not decrease as the number of processors increases. In two-level host-sub-processors mode, more than 2000 processors are used and one billion unknowns are solved. By combining the finite-element implicit dynamic Newmark integral scheme, this approach achieves a prestack reverse time migration (RTM) with high expansion. Making full use of the characteristics of high accuracy and strong boundary adaptability of the finite-element method, through the optimisation of finite-element solving, the HEP-FE-RTM algorithm improved the efficiency of parallel computing and achieved RTM implementation using finite element. Model tests show that this method has a significant effect on both imaging efficiency and accuracy.

关键词Cohesion Degree Finite Element Local Relaxation Multi-level Parallel Reverse Time Migration
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8925
专题矿床地球化学国家重点实验室
作者单位1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.Geophysical Research Institute, Jiangsu Oilfield Company, SINOPEC, Nanjing 210046, China
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GB/T 7714
Limin Liu;Yun Wang;Yong Wang;Jing Chen;Yanqiu Liu. A high expansion implicit finite-element prestack reverse time migration method[J]. Exploration Geophysics,2018,49(6):844-855.
APA Limin Liu;Yun Wang;Yong Wang;Jing Chen;Yanqiu Liu.(2018).A high expansion implicit finite-element prestack reverse time migration method.Exploration Geophysics,49(6),844-855.
MLA Limin Liu;Yun Wang;Yong Wang;Jing Chen;Yanqiu Liu."A high expansion implicit finite-element prestack reverse time migration method".Exploration Geophysics 49.6(2018):844-855.
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