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《Chinese Journal of Geophysics》 2017-07
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Elastic reverse time migration based on wavefield separation

WANG Wei-Hong;ZHANG Wei;SHI Ying;KE Xuan;Earth Science College of Northeast Petroleum University;Science and Technology Innovation Team on Fault Deformation,Sealing and Fluid Migration;  
Compared with other imaging algorithms(e. g., ray-based and one-way wave equation),reverse time migration(RTM) based on two-way wave equation exhibits great superiority, especially in dealing with steeply dipping structures. However, imaging with conventional single-component seismic data may become imperfect in some complicated structures(e. g., gas clouds). The elastic reverse time migration based on the elastodynamic equation using multi-component seismic data can extract PP and PS reflectivity containing subsurface information, thus it can be more consistent with characteristics of elastic wave propagation in the real earth's medium,and resulting seismic images can more accurately characterize the subsurface. To begin with, we employ the first-order velocity-stress equations to implement extrapolation of elastic vector wavefields, and separate P-and S-wavefields by computing the divergence and curl operators of the extrapolated velocity vector wavefields. Then, imaging data with pure wave modes can be computed by applying the source normalized cross-correlation imaging condition, thus avoiding the crosstalk between the unseparated wave modes. To address the polarity reversal problem of converted images, we propose an alternative method in the shot domain. We also develop an efficient method that reconstructs source wavefields in the reverse time direction to save storage in CPU and avoid large input/output for elastic reverse time migration. During the forward modeling, the method only saves velocity vector wavefields of all time interval within an efficient absorbing boundary and total wavefields in the last time interval. When we extrapolate the receiver wavefields in reverse time direction, simultaneously, we reconstruct the total source wavefields by the saved wavefields. Numerical examples with a graben and Marmousi2 models show that the polarity reversal correction method works well and that elastic reverse time migration can generate accurate images for complicated structures.
【Fund】: 国家自然科学基金项目(41574117 41474118);; 黑龙江省杰出青年科学基金项目(JC2016006);; 大连理工大学海岸和近海工程国家重点实验室开放基金(LP1509)联合资助
【CateGory Index】: P631.4
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【Citations】
Chinese Journal Full-text Database 4 Hits
1 WANG Bao-Li1,GAO Jing-Huai1,CHEN Wen-Chao1,ZHANG Huan-Lan2 1 Xi′an jiaotong university,Xi′an 710049,China 2 Xi′an university of science and technology,Xi′an 710054,China;Efficient boundary storage strategies for seismic reverse time migration[J];地球物理学报;2012-07
2 LI Bo~1 , LIU Hong-Wei~1 , LIU Guo-Feng~1 , TONG Xiao-Long~2,LIU Hong~(1*) , GUO Jian~1 , PEI Jiang-Yun~3 1 Institute of Geology and Geophysics , Chinese Academy of Sciences , Beijing 100029, China 2 Beijing Geostar Science and Technology Ltd. Beijing 100029, China 3 Exploration and Development Institute, Daqing Oil Field Ltd,FetroChina, Daqing 163712, China;Computational strategy of seismic pre-stack reverse time migration on CPU/GPU[J];地球物理学报;2010-12
3 LIU Hong-Wei~(1,2),LI Bo~(1,2),LIU Hong~1,TONG Xiao-Long~3,LIU Qin~3 1 Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2 Graduate University,the Chinese Academy of Sciences,Beijing 100049,China 3 Beijing Geostar Science and Technology Co.Ltd,Beijing 100029,China;The algorithm of high order finite difference pre-stack reverse time migration and GPU implementation[J];地球物理学报;2010-07
4 LIU Guo-Feng~1,LIU Hong~1,LI Bo~1,LIU Qin~2,TONG Xiao-Long~21 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China2 Beijing Geostar Sciences and Technology Co.Ltd,Beijing,100029,China;Method of prestack time migration of seismic data of mountainous regions and its GPU implementation[J];地球物理学报;2009-12
【Co-citations】
Chinese Journal Full-text Database 10 Hits
1 Tang Yongjie;Song Guiqiao;Liu Shaoyong;Gu Hanming;Yan Zhe;Institute of Geophysics and Geomatics,China University of Geosciences (Wuhan);Hubei Subsurface Multi-scale Imaging Key Laboratory;Exploration & Development Department,SINOPEC;;Turning wave false image removal based on wavelength-dependent smoothing operator in reverse time migration[J];石油地球物理勘探;2018-01
2 LIU Wei;ZHANG JianFeng;Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;;De-absorption prestack time migration:steep dip structure imaging and its application[J];地球物理学报;2018-02
3 SONG Li-wei;SHI Ying;KE Xuan;ZHANG Wei;KONG Xiang-qi;Northeast Petroleum University;Heilongjiang Province College Science and Technology Innovation Team 'Faults Deformation,Sealing Ability and Fluid Migration';NO.1 Geophysical Exploration Company Daqing Drilling & Exploration Engineering Corporation;;Variable order finite difference method and optimization strategy of efficient boundary storage for reverse time migration[J];地球物理学进展;2017-06
4 LIU Guo-Feng;LI Chun;L Qing-tian;School of Geophysics and Information Technology,China University of Geosciences;Institute of Mineral Resource,Chinese Academy of Geological Sciences;;Key technologies about reverse time migration in TTI media[J];地球物理学进展;2017-06
5 Yan Hongqun;Sun Jianguo;College of Geodetection Science and Technology,Jilin University;;A Depth Migration Imaging Method Based on Generalized Diffraction Stack[J];工程地球物理学报;2017-06
6 YANG Ren-hu;LING Yun;QU Li-jian;WAN Yong-ge;LI Ying-qiu;SHI Yan-bin;Institute of Disaster Prevention;BGP CNPC;;Reverse Time Migration Amplitude Compensation Based on Source Illumination[J];科学技术与工程;2017-31
7 Wu Sihai;Zhao Hu;Yin Cheng;Jia Peng;School of Geosciences and Technology,Southwest Petroleum University;Sichuan Key Laboratory of Natural Gas Geology,Southwest Petroleum University;Geophysical Company,Chuanqing Drilling Engineering Company Limited,CNPC;;Wide-angle seismic reflection characteristics and inversion[J];石油地球物理勘探;2017-05
8 ZHANG Li-Mei;CHENG Gu;School of Earth Sciences and Engineering,Sun Yat-Sen University;Guangdong Key Laboratory of Geological Process and Mineral Resources Exploration;;Parameterized random boundary condition and its application on seismic RTM[J];物探与化探;2017-05
9 KE Xuan;SHI Ying;SONG Liwei;LI Songling;Northeast Petroleum University;Heilongjiang Province college science and technology innovation team "faults deformation,sealing ability and fluid migration";;Numerical modeling of acoustic wave equations based on convolutional perfectly matched layer absorbing boundary condition[J];石油物探;2017-05
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Chinese Journal Full-text Database 10 Hits
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7 LIU Guo-Feng~1,LIU Hong~1,LI Bo~1,LIU Qin~2,TONG Xiao-Long~21 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China2 Beijing Geostar Sciences and Technology Co.Ltd,Beijing,100029,China;Method of prestack time migration of seismic data of mountainous regions and its GPU implementation[J];地球物理学报;2009-12
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