Fast wave-mode separation in anisotropic elastic reverse time migration using the phase velocity-related Poynting vector

Wang，Xiaoyi1,2; Zhang，Jianfeng3

2022-07-15

10.1016/j.jcp.2022.111200

JOURNAL OF COMPUTATIONAL PHYSICS   影响因子和分区

0021-9991

1090-2716

We present a phase velocity-related Poynting vector in elastic modeling that represents the direction of the phase velocity rather than that of the group velocity as obtained by the conventional Poynting vector. This yields a highly efficient wave-mode separation scheme for vector elastic reverse time migration (ERTM), especially in anisotropic cases. We separate qP- and qSV-waves by first obtaining the polarization vector based on the proposed Poynting vector using an analytical formula and then performing a coordinate transformation based on the resulting polarization vector. Only a tiny amount of additional storage or computation is required. We provide a numerical implementation under both regular and unstructured meshes, thus allowing for spatially varying grid sizes according to the local velocities as well as accurate description of interface topographies. A Poynting vector and unstructured-mesh-based anisotropic ERTM scheme was then proposed. The resulting scheme can yield migrated opening-angle gathers related to qP- and qSV-waves without extra effort. The accuracy and efficiency of the resulting scheme are verified by several numerical examples of two-dimensional transverse isotropic media.

Anisotropy Elastic reverse time migration Fast wave-mode separation Poynting vector Unstructured mesh

SCI ; EI

英语

通讯

National Key Research and Development Program of China[2020YFA0713402];National Natural Science Foundation of China[42030802];

Computer Science ; Physics

Computer Science, Interdisciplinary Applications ; Physics, Mathematical

WOS:000802129600001

ACADEMIC PRESS INC ELSEVIER SCIENCE

20221812067258

Electromagnetic waves ; Mesh generation ; Phase velocity ; Polarization ; Separation ; Vectors ; Velocity

Electromagnetic Waves:711 ; Electromagnetic Waves in Different Media:711.1 ; Computer Applications:723.5 ; Chemical Operations:802.3 ; Algebra:921.1 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Physical Properties of Gases, Liquids and Solids:931.2

PHYSICS

2-s2.0-85129250969

Scopus

1.Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China
2.University of Chinese Academy of Sciences,Beijing,100049,China
3.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,518055,China

Wang，Xiaoyi,Zhang，Jianfeng. Fast wave-mode separation in anisotropic elastic reverse time migration using the phase velocity-related Poynting vector[J]. JOURNAL OF COMPUTATIONAL PHYSICS,2022,461.

Wang，Xiaoyi,&Zhang，Jianfeng.(2022).Fast wave-mode separation in anisotropic elastic reverse time migration using the phase velocity-related Poynting vector.JOURNAL OF COMPUTATIONAL PHYSICS,461.

Wang，Xiaoyi,et al."Fast wave-mode separation in anisotropic elastic reverse time migration using the phase velocity-related Poynting vector".JOURNAL OF COMPUTATIONAL PHYSICS 461(2022).